POWER PROTECTION Static Transfer Switch 2 INSTALLATION, OPERATION & MAINTENANCE MANUAL 100-1000 Amp, 50-60 Hz
Table of Contents LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VII LIST OF TABLES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IX IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 OVERVIEW OF MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.0 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.1 Programmable Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.2 Input Contact Isolator Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.3 Comms Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.0 OPERATING INSTRUCTIONS FOR THE TOUCH SCREEN INTERFACE . . . . . . . . . . . . . . . . . 58 10.1 Normal System Turn-On. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 10.2 Manual Transfer / Preferred Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 10.3 Enabling Remote Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 10.
13.7 Cleaning the LCD Touch Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 14.0 OPERATING THE LED DISPLAY STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 14.1 LEDs and Buttons and Key Lockout Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 14.1.1 14.1.2 14.1.3 14.1.4 14.1.5 14.2 Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 17.1 Proper Tightening of Nuts and Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 17.2 Testing the STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 17.3 Changing the Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 Figure 36 Figure 37 Figure 38 Figure 39 Figure 40 Figure 41 Figure 42 Figure 43 Figure 44 Figure 45 Figure 46 Figure 47 Figure 48 Figure 49 Recommended De
Figure 50 Figure 51 Figure 52 viii Front Panel LEDs and Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Key Lockout Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Table 19 Table 20 Table 21 Table 22 Table 23 Table 24 Table 25 Table 26 Heat Output .................................................................................................................................... 10 Altitude Conversion—Feet to Meters ........................................................................................
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IMPORTANT SAFETY INSTRUCTIONS Save these instructions This manual contains important instructions that should be followed during the installation and maintenance of the Liebert Static Transfer Switch 2 (STS2). ! WARNING THE UNIT IS SUPPLIED BY MORE THAN ONE POWER SOURCE. THE UNIT CONTAINS HAZARDOUS VOLTAGES IF ANY OF THE INPUT SOURCES ARE ON, EVEN WHEN THE UNIT IS IN BYPASS. TO ISOLATE THE UNIT, TURN OFF AND LOCK OUT ALL INPUT POWER SOURCES.
OVERVIEW OF MANUAL The STS2 Installation, Operation and Maintenance Manual is organized in a logical progression so that you can follow the procedures, in the order provided to get your STS2 installed and running. Read the entire manual before proceeding with the unpacking and installation of the STS2. The major sections are as follows: Important Safety Instructions—review the instructions on the previous page before proceeding.
SUPPORT INFORMATION If you require assistance for any reason, in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States, contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide qualified factory-authorized service. Please have the following information available.
Channel 4: Channel 5: Channel 6: Channel 7: Channel 8: Channel 9: Channel 10: PRB Notes: 4
INPUT CONTACT ISOLATOR SETTINGS RECORD The Input Contact Isolator board (ICI) provides an STS2 module interface for up to eight external user alarm or message inputs to be routed through the static transfer switch’s alarm network. See 6.2 - Input Contact Isolator Board on page 19 for more information on the ICI. If your STS2 has the ICI option installed, list the settings below for future reference. If control power is lost in the STS2, the settings are not saved.
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1.0 SAFETY PRECAUTIONS Read this manual thoroughly before working with the static transfer switch. Be sure to review the warning under Important Safety Instructions on page 1. Refer to the Handling Considerations on page 9 before attempting to move the unit. Under typical operation and with the doors closed, only normal safety precautions are necessary. The area around the static transfer switch should be kept free from puddles of water, excess moisture and debris.
2.0 UNPACKING AND INSPECTIONS NOTE Read the entire manual before installing and operating the unit. Upon receipt of the STS2, the installer should perform the following steps to assure a high-quality installation. A high-quality installation begins on the receiving dock. The STS2 and its packaging should be inspected when the unit is delivered. If the packaging is not damaged, unpack the unit and conduct an internal inspection before beginning the installation process.
2.2.1 Handling Considerations The static switch is bolted to a wooden shipping pallet to allow handling by forklift equipment or a pallet jack. Easily Moved — The unit is furnished with integral castors that allow the unit to be rolled into place after it has reached its location and is removed from the pallet. ! WARNING EXERCISE EXTREME CARE WHEN HANDLING STATIC SWITCH CABINETS TO AVOID EQUIPMENT DAMAGE OR INJURY TO PERSONNEL. THE CABINET CAN BE SAFELY TILTED 15 DEGREES IN ANY DIRECTION BY FORKLIFT.
3.0 LOCATION CONSIDERATIONS The STS2 should be placed in a clean, cool and dry location. The STS2 requires only front access for installation and maintenance. Back or side access is not required. Adequate space is required above the unit for conduit (if configured as such) and cooling air flow. This section provides specific information for these considerations. The unit is designed with top and bottom cable terminations to allow maximum flexibility in its installation.
3.4 Altitude The standard units are designed for full load operation up to 4000 feet (1200 m) above sea level. See Figure 1 for recommended deratings for altitudes greater than 4000 feet (1200 m).
4.0 LOCATING THE STS2 This section provides instructions for leveling the STS2 and anchoring the unit to the floor, should that be required. For leveling feet details, see Figure 5 through Figure 10 in section 7.0 - Installation Drawings on page 23. 4.1 Leveling and Anchoring the Unit to the Floor The STS2 can be anchored to the concrete floor to ensure stability for the unit in the event of seismic activity.
5.0 POWER AND CONTROL WIRING All power and control wiring should be installed by a qualified electrician. All power and control wiring must comply with the NEC and applicable local codes. Unless otherwise labeled, use the recommended tightening torque as shown in Table 26 - Torque tightening, provided in 17.0 Maintenance on page 135. The bus bars are accessible through the front of the STS 2, and are designed to allow one-handed tightening.
Figure 3 Typical Static Transfer Switch One-Line Diagram SOURCE 1 SOURCE 2 CB1 SS1 STS1 SS2 STS2 K2 K1 K2 K3 CB2 CB4 CB3 K1 K3 CB5 OUTPUT The input and output power wire size should be based on the upstream overcurrent protection device, observing the NEC and local codes. The molded case switches contained in the STS2 are typically non-automatic circuit breakers that rely on the upstream and/or load overcurrent protection.
For preparation purposes, the following tables provide the dimensions and wire sizes for the input junction boxes. Table 4 Switch Rating Length Inches (mm) Width Inches (mm) Height Inches (mm) 100 amp 16 (406) 14 (356) 6 (152) 250 to 600 amp 30 (762) 16 (406) 6 (152) Table 5 5.
Figure 4 Typical One-Line Diagram of Two PDUs and a Static Transfer Switch SOURCE 1 SOURCE 2 MICB1 MICB2 ISOLATION TRANSFORMER CB1 SS1 STS1 ISOLATION TRANSFORMER SS2 STS2 K2 K1 K2 K3 225A 5.4 225A CB4 225A CB2 CB3 K1 K3 CB5 225A 225A 225A Control Wiring Connections No control wiring is needed on the standard STS2. Only certain options require external control wiring. See 6.0 - Options on page 18 for details 5.
Table 6 Remote Source Selection Terminal Block Contact Connection 1 Source 1 2 Isolated ground 3 Source 2 4 Isolated Ground 5 DO NOT USE 6 DO NOT USE See 10.3 - Enabling Remote Source Selection on page 61 for instructions on enabling the Remote Source Selection option. 5.6 Power Supply The STS2 is supplied with redundant power supplies that are designed to operate from a voltage range of 200V to 600V. The unit is set at the factory to match the nameplate voltage.
6.0 OPTIONS This section discusses the options available for the STS2. The communications options are also discussed in 12.0 - Communication Interfaces on page 70. ! 6.1 WARNING ALL OPTIONS MUST BE INSTALLED BY LIEBERT GLOBAL SERVICES OR LIEBERT FACTORY-AUTHORIZED SERVICE PROVIDED BY A LIEBERT DISTRIBUTOR. THE OPTION AREA AND CUSTOMER CONTROL CABLE AREA CONTAIN HAZARDOUS VOLTAGES IF ANY OF THE INPUT SOURCES ARE ON, EVEN WHEN THE UNIT IS IN BYPASS.
6.2 Input Contact Isolator Board The Input Contact Isolator Board (ICI) provides an STS2 module interface for up to eight external user alarm or message inputs to be routed through the static transfer switch’s alarm network. The eight contacts are normally open dry contacts. When a contact closes, an event is triggered. The Input Contact Isolator options are configured through the Input Contact Isolator dialog box, which is accessed from the Comm Option dialog box on the touch screen display.
6.5 Network Interface Card (NIC) An OpenComms Network Interface Card (NIC) enables the STS2 to communicate to a network management system (NMS). The NIC provides the internal hardware and software to communicate, via SNMP, to any I.P.-based Ethernet network through an RJ-45 connector using Category 5 cabling. The NIC provides redundant paths for communications that make it possible to connect to a Building Management System (BMS) using Modbus, while simultaneously communicating to a NMS through SNMP.
6.9 Input Junction Boxes and Cables Two input power junction boxes and interconnecting cables provide under floor connection for the two input power feeds. Power terminal blocks are provided in each junction box for the connection of the input power conductors and a parity-sized ground conductor. The junction boxes are NEMA 1 enclosures. A main input cable assembly is provided for connection between the unit and the junction box.
22 Options
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY POWER CABLE BOTTOM ENTRY AREA CONTROL CABLE BOTTOM ENTRY AREA 12MM CENTERS CASTER CENTERS 12MM CENTERS AIR EXHAUST CENTER GRAVITY 10/23/02 DATE PS211100 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 CONTROL CABLE TOP ENTRY AREA DETAIL A FRONT OF UNIT SHOWN WITHOUT SIDE PANEL 12MM DIA THREADED MOUNTING HOLE (4) TYP (SEE NOTES 10 & 11) POWER CABLE TOP ENTRY AREA FILE NAME: STATICSWITCH2/OUTLINE/PS211100 1 REV. NO. DWG. NO.
24 Installation Drawings REF. DWG.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY FRONT POWER CABLE BOTTOM ENTRY AREA CASTER CENTERS FRONT VIEW 12MM CENTERS SEE DETAIL A 12MM CENTERS CASTER CENTERS OUTLINE DRAWING 800 - 1000 AMP STATIC TRANSFER SWITCH 2 BOTTOM VIEW CONTROL CABLE BOTTOM ENTRY AREA AIR INTAKE AREA DO NOT BLOCK AIR FILTER CENTER GRAVITY BREAKER CABINET 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 FRONT POWER CABLE TOP ENTRY AREA DETAIL A LEVELER MAX.
26 Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY BOTTOM VIEW FRONT CASTER CENTERS FRONT VIEW CENTER GRAVITY 12MM CENTERS CASTER CENTERS 12MM CENTERS AIR EXHAUST CENTER GRAVITY 11/6/02 DATE PS211101 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 CONTROL CABLE TOP ENTRY AREA DETAIL A FRONT OF UNIT SHOWN WITHOUT SIDE PANEL 12MM DIA THREADED MOUNTING HOLE (4) TYP (SEE NOTES 10 & 11) POWER CABLE TOP ENTRY AREA FILE NAME: STATICSWITCH2/OUTLINE/PS211101 REV. NO. DWG. NO.
Installation Drawings REF. DWG.
28 Installation Drawings REF. DWG.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY (107 MM) 4.2" (335 MM) 13.2" TOP VIEW (256 MM) 10.1" FRONT (335 MM) 13.2" (107 MM) 4.2" (146 MM) 5.75" REAR FLOOR BRACKET SEE NOTE (2) FOR SPACING BACK WALL OUTLINE DRAWING SEISMIC ANCHORING 100 - 250 AMP STATIC TRANSFER SWITCH 2 4. INSTALL FRONT CABINET BASE BRACKET (FIG. 3) TO EXISTING HOLES ON UNDERSIDE OF UNIT WITH BENT FLANGE FACING FRONT. USE SUPPLIED HARDWARE AND TORQUE TO 365 LB-INCH (41.2 Nm).
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY (335 MM) 13.2" TOP VIEW (462 MM) 18.2" FRONT (335 MM) 13.2" (107 MM) 4.2" (146 MM) 5.75" REAR FLOOR BRACKET SEE NOTE (2) FOR SPACING BACK WALL OUTLINE DRAWING SEISMIC ANCHORING 400 - 600 AMP STATIC TRANSFER SWITCH 2 4. INSTALL FRONT CABINET BASE BRACKET (FIG. 3) TO EXISTING HOLES ON UNDERSIDE OF UNIT WITH BENT FLANGE FACING FRONT. USE SUPPLIED HARDWARE AND TORQUE TO 365 LB-INCH (41.2 Nm).
Installation Drawings DRAWN BY V CARMONA CHK BY REF. DWG. SIDE WALL (107 MM) 4.2" (335 MM) 13.2" (107 MM) 4.2" (289 MM) 11.4" TOP VIEW (107 MM) 4.2" (396 MM) 15.6" (817 MM) 32.2" OUTLINE DRAWING SEISMIC ANCHORING 800 - 1000 AMP STATIC TRANSFER SWITCH 2 4. INSTALL FRONT CABINET BASE BRACKET (FIG. 3) TO EXISTING HOLES ON UNDERSIDE OF UNIT WITH BENT FLANGE FACING FRONT. USE SUPPLIED HARDWARE AND TORQUE TO 365 LB-INCH (41.2 Nm).
32 Installation Drawings GROUND BUS REF. DWG. DRAWN BY V CARMONA CHK BY FRONT VIEW ELECTRICAL FIELD CONNECTIONS 100 - 250 AMP WITH SINGLE OUTPUT BREAKER STATIC TRANSFER SWITCH 2 (WITH FRONT PANELS REMOVED) FRONT SYSTEM OUTPUT Ø A, Ø B, Ø C CB3 CB5 CB4 SOURCE 2 INPUT Ø A, Ø B, Ø C SOURCE 1 INPUT Ø A, Ø B, Ø C CB2 NEUTRAL BUS PEM NUT 4/16/03 DATE PS212100 FILE NAME: STATICSWITCH2/EFC/PS212100-03 3 REV. NO. DWG. NO.
GROUND BUS Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY FRONT PEM NUT 4/16/03 DATE PS212101 FILE NAME: STATICSWITCH2/EFC/PS212101-03 3 REV. NO. DWG. NO. SIDE VIEW CB3A CB3 SYSTEM OUTPUT 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 ONE-LINE DIAGRAM K1 K3 K2 K1 CB4 CB2 CB1 CB5 SOURCE 2 7. THE TORQUE REQUIREMENT FOR 1/2"-13 PEM NUTS IS 428 INCH-LBS. (48 N-m). 6. HARDWARE KIT IS SUPPLIED FOR INPUT, OUTPUT, NEUTRAL, AND GROUND CABLE CONNECTIONS.
34 Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY NEUTRAL BUS CB4 CB1 .51 DIA.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY CB3A NEUTRAL BUS CB4 CB1 .51 DIA.
36 Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY FRONT VIEW CB1 .51 DIA. SOURCE 1 INPUT Ø A, Ø B, Ø C INPUT/OUTPUT BUS RIGHT SIDE VIEW .51 DIA. 4/16/03 DATE PS212800 FILE NAME: STATICSWITCH2/OUTLINE/PS212800-02 2 REV. NO. SIDE VIEW SECTION A-A NEUTRAL BUS RIGHT SIDE VIEW DWG. NO.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY FRONT VIEW ELECTRICAL FIELD CONNECTIONS 800 - 1000 AMP WITH DUAL OUTPUT BREAKERS STATIC TRANSFER SWITCH 2 (WITH FRONT PANELS REMOVED) 4/16/03 DATE PS212801 FILE NAME: STATICSWITCH2/OUTLINE/PS212801-02 2 REV. NO. DWG. NO. SIDE VIEW SECTION A-A CB3A CB3 SYSTEM OUTPUT ONE-LINE DIAGRAM CB5 SOURCE 2 K1 K3 K2 K1 CB4 CB2 CB1 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 K2 K3 SOURCE 1 7.
38 Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY TYPE NSF NSF NSJ NSJ CK CK VENDOR MERLIN GERIN MERLIN GERIN MERLIN GERIN MERLIN GERIN MERLIN GERIN MERLIN GERIN AMPACITY VOLTAGE WITHSTAND CURRENT CIRCUIT BREAKER SCHEDULE 100AMP TO 1000AMP STATIC TRANSFER SWITCH 2 FILE NAME: 10/24/02 DATE PS214000 STATICSWITCH2/BRKTABLEALL/PS214000 REV. NO. DWG. NO. 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 2. UPSTREAM DEVICES (BY OTHERS) MUST PROVIDE OVERCURRENT PROTECTION.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY CONTROL WIRING CONTROL CONNECTION LOCATION DIAGRAM 100 - 600 AMP STATIC TRANSFER SWITCH 2 FRONT VIEW WITH FRONT DOOR REMOVED 6/9/03 DATE PS213000 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 OPTION LOCATION DETAIL FILE NAME: STATICSWITCH2/CONTROLWIRE/PS213000-01(C) 1 REV. NO. DWG. NO.
40 Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY CONTROL WIRING CONTROL CONNECTION LOCATION DIAGRAM 800 - 1000 AMP STATIC TRANSFER SWITCH 2 FRONT VIEW WITH FRONT DOOR REMOVED SEE OPTION LOCATION DETAIL 6/9/03 DATE PS213800 FILE NAME: STATICSWITCH2/CONTROLWIRE/PS213800-01(C) 1 REV. NO. DWG. NO.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY 2 1 4 GND TB50 3 S2 SOURCE 2 PREFERRED 5 6 CONTROL WIRING REMOTE SOURCE SELECTION OPTION STATIC TRANSFER SWITCH 2 REMOTE SOURCE SELECTION GND S1 SOURCE 1 PREFERRED SEE NOTE 1 6/9/03 DATE PS213007 FILE NAME: STATICSWITCH2/CONTROLWIRE/PS213007-01(C) 1 REV. NO. DWG. NO. 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 5. ALL WIRING MUST BE IN ACCORDANCE WITH NATIONAL AND LOCAL ELECTRICAL CODES. 4.
42 Installation Drawings REF. DWG.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY CONTROL WIRING INPUT CONTACT ISOLATOR BOARD OPTION STATIC TRANSFER SWITCH 2 TABLE (J51) J51 43 6/2/03 DATE PS213002 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 8. ALL WIRING MUST BE IN ACCORDANCE WITH NATIONAL AND LOCAL ELECTRICAL CODES. 7. MAXIMUM CABLE LENGTH 500 FT. (152 METERS) WITH #16AWG FLEXIBLE STRANDED CABLE. 6. SIGNAL VOLTAGE: 100mAMP @ 12VDC. 5.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY SITESCAN SEE DETAIL B NO CUSTOMER CONNECTION NO CUSTOMER CONNECTION TB56 CONTROL WIRING COMMS BOARD FOR COMMUNICATION OPTIONS STATIC TRANSFER SWITCH 2 COMMS BOARD 02-810015-XX TB55 J81 DETAIL A J81 1 2 3 4 5 6 7 8 9 TB51 EXTERNAL MODEM SEE DETAIL A SEE NOTE 2 DC D RX TX DT R GN D DS R RT S CT S RI 44 6/3/03 DATE PS213003 FILE NAME: STATICSWITCH2/CONTROLWIRE/PS213003-01(C) 1 REV. NO. DWG. NO.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY CUSTOMER SUPPLIED INTERCONNECTING CABLE (SEE NOTES) CONTROL WIRING COMMS BOARD INTERNAL MODEM OPTION STATIC TRANSFER SWITCH 2 DETAIL A RJ-11 CONNECTOR J1A MODEM LINE COMMUNICATIONS TO TELEPHONE LINE 6/9/03 DATE PS213004 FILE NAME: STATICSWITCH2/CONTROLWIRE/PS213004-01(C) 1 REV. NO. DWG. NO. COMMS BOARD 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 J1A SEE DETAIL A 6.
46 Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY "NO CUSTOMER CONNECTION" "NO CUSTOMER CONNECTION" NETWORK INTERFACE CARD (NIC) 416241GX P18 CONTROL WIRING NETWORK INTERFACE CARD OPTION STATIC TRANSFER SWITCH 2 CUSTOMER SUPPLIED INTERCONNECTING CABLE TO MODBUS SEE NOTE 2 + - 1 2 3 TB2 RS-232 (DB9 CONNECTOR) FOR SETUP ONLY.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY CONTROL WIRING RS-232 INTERFACE STATIC TRANSFER SWITCH 2 UPPER HALF OF UNIT WITH DOOR OPENED FRONT VIEW LCD DISPLAY SEE DETAIL A 11/8/02 DATE PS213006 FILE NAME: STATICSWITCH2/OUTLINE/PS213006 REV. NO. DWG. NO. RXD GND 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 DETAIL A DB9 CONNECTOR TXD 1 2 3 4 5 6 7 8 9 2. CONNECTOR ACCESSIBLE WITH FRONT DOOR OPENED. CONNECTOR MUST BE REMOVED PRIOR TO CLOSING DOOR. 1.
48 Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY 6 [152] 6 [152] 14 [356] 30 [762] 16 [406] 16 [406] 100A 250A - 600A INPUT JUNCTION BOX D B 33 [830] 17 1/2 [445] D 7/16 [11] 5/16 [8] G 11/7/02 DATE PS211005 32 [813] 16 3/4 [426] F A G DIA. HOLE H C (2) #6 AWG TO (2) 500 kcmil #6 AWG TO #2/0 AWG WIRE SIZE RANGE 3. PARALLEL CABLES ARE USED ON 400A AND 600A UNITS. 2. CABLE(S) ARE FACTORY SUPPLIED TO CONNECT THE JUNCTION BOX TO THE INPUT BUSBARS.
Installation Drawings REF. DWG. DRAWN BY V CARMONA CHK BY EVENT DISPLAY ALARM CONTROLS MIMIC SILENCE LOGS CB 2 CB 1 -30 0 OUTPUT 70 KVA 70 KW 80 % LOAD 0 XFERS CB 5 CB 3 CB 4 10/29/02 DATE FILE NAME: STATICSWITCH2/OUTLINE/PS211000 REV. NO. DWG. NO. BYP. PROC. PS211000 SOURCE 1 +30 LOGO LOAD 1050 DEARBORN DRIVE, COLUMBUS, OHIO 43229 HELP SOURCE 2 SOURCE 1 LEADS SOURCE 2 BY 3.5 DEG. STARTUP PROC. SOURCE 2 A-B B-C C-A 195V 195V 195V 0A 0A 0A 0.
50 Installation Drawings
8.0 INTRODUCTION TO STS2 OPERATIONS 8.1 System Description A STS2 provides an automatic, seamless transfer between input power sources to an output load. The STS2 monitors the input sources, to ensure each source is operating within set parameters, as well as ensure that each source is within acceptable tolerances for a transfer between sources to be completed.
8.1.2 Reliability and Agency Requirements The STS2 is designed for high reliability and high availability with a critical bus Mean Time Between Failure (MTBF) exceeding 1,000,000 hours. The STS2, Control/Power Module, and all its options are designed, tested and certified, where applicable, to meet agency requirements as follows: • UL 1008: Transfer Switch Equipment, for UL and ULc listing • UL1459: Telephone equipment (Modem) • NEC • FCC Part 15 EMI emission limits for Class A computing devices.
8.2.3 Transfer Inhibit For a transfer to be completed between input sources, the sources must meet certain parameters, or the transfer cannot take place. Uninterrupted transfer between sources is inhibited due to input source failure, sources out of sync, switch failure, or the unit is in bypass mode. 8.2.4 Bypass The static transfer switch can be manually bypassed to allow the power from a source to directly flow to the output load.
9.0 THEORY OF OPERATION 9.1 General Description The STS2 contains all the equipment necessary to prevent an interruption in power flow to the AC load, should your primary source fail. 9.1.1 STS2 Static Transfer Switch The STS2 is a 3 pole, double-throw, solid state automatic transfer switch that is fed from two sources. The Preferred source is the input source that normally carries the load when both sources are available.
9.1.4 Emergency Transfer To ensure that power remains connected to the load, the STS2 automatically performs an emergency transfer from one input source to the other when an outage occurs on the existing source. The automatic transfer takes place if the other source’s voltage is within acceptable limits, and regardless of the phase difference between the two sources. Emergency transfers occur with a loss of power on the output of less than 4 ms.
Hardware • The STS2 operator interface in the Color Graphical Display unit is designed to provide all of the information required to configure and monitor the unit’s operation. • The control logic performs automatic operations with minimal operator interface. • Each STS2 unit is equipped with either a color LCD touch screen or a panel of LEDs and push buttons. • The STS2 can have optional communication ports installed. See 6.0 - Options on page 18 and 12.
9.2.3 SCRs Brick-type SCRs are used rated to carry the full 100% rated load. Because the unit is a fuseless design with non-automatic circuit breakers, overcurrent protection is provided by upstream circuit breakers. 9.2.4 Logic Modules The logic contains three separate redundant logic modules. The modules contain the logic necessary to run the STS2 and control transfers and shunt trips under all circumstances, without any outside assistance once set-up and started properly. 9.2.
10.0 OPERATING INSTRUCTIONS FOR THE TOUCH SCREEN INTERFACE ! CAUTION Before unit is placed into service for the first time, after equipment relocation, or after the equipment has been deenergized for an extended period of time, a thorough equipment inspection and supervised start-up by qualified personnel are strongly recommended. Contact your local Liebert representative or Liebert Global Services at 1-800-543-2378 to arrange for equipment inspection and start-up.
Figure 33 STS2 Touch Screen Display Mimic Sources Static Transfer Switch Event controls Event display 4. Close CB1. 5. Verify that Source 1 voltages are nominal and CB1 breaker status is correctly indicated on the Monitor/Mimic screen. 6. Close CB2. 7. Verify that Source 2 voltages are nominal and CB2 breaker status is correctly indicated on the Mimic screen. 8.
NOTE If one source will be de-energized for an extended period (hours or days), set the unit to bypass mode for the remaining source. Without using bypass, if a failure occurs in the switch components for remaining source, the STS2 does not have a second source to switch to and the load would not receive power. See Maintenance Bypass on page 61 for bypass instructions. If your system contains the LED front panel instead of the LCD touch screen, refer to 14.2.
If the Transfer Inhibit message is displayed, check for alarm messages on the Active Status window. Correct alarm conditions before attempting a source transfer. NOTE The preferred source may also be changed via the optional Remote Source Selection option, thereby initiating a transfer remotely. 10.3 Enabling Remote Source Selection If your system is equipped with the optional Remote Source Selection option, it must be enabled. If you your system includes the Color Graphical Display: 1. 2. 3. 4.
Figure 35 Gate Board Viewing Slot Locations Touch Screen Viewing Slot for the Source 1 Gate Drive Board Viewing Slot for the Source 2 Gate Drive Board GREEN LEDS ON THE GATE DRIVER BOARD ARE VIEWABLE THROUGH THIS SLOT INDICATE THAT THE STS IS ON SOURCE 1 GREEN LEDS ON THE GATE DRIVER BOARD ARE VIEWABLE THROUGH THIS SLOT INDICATE THAT THE STS IS ON SOURCE 2 GREEN LEDS ON THE GATE DRIVER BOARD ARE VIEWABLE THROUGH THIS SLOT INDICATE THAT THE STS IS ON SOURCE 1 If the Color Graphical Display is not avai
To return to the normal mode: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Remove the key from CB5 and insert it in the CB1 breaker interlock. Rotate key to retract interlock. Close source input breaker CB1. Verify the Source 1 and CB1 breaker status on the Mimic screen. Close output breakers CB3 and CB3A (if supplied). Verify CB3 and CB3A breaker status and STS SOURCE 1 and OUTPUT boxes are highlighted on the Mimic screen. Open bypass breaker CB4. Rotate the keys in CB4 interlock to extend the interlock.
To return to normal mode: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 10.5 Insert the key in the CB2 breaker interlock. Rotate the key to retract the interlock. Close source input breaker CB2. Verify Source 2 and CB2 breaker status on the Mimic screen. Close output breakers CB3 and CB3A (if supplied). Verify CB3 and CB3A breaker status and STS SOURCE 2 and OUTPUT boxes are highlighted on the Mimic screen. Open bypass breaker CB5. Rotate the keys in CB5 interlock to extend the interlock.
11.0 ALARM AND FAULTS Alarms and faults are events that are triggered when the operation of the static transfer switch falls outside of the defined parameters. These events can also be triggered by: user actions, such as changing configurations, clearing logs, etc.; failed components such as a fan failure, an SCR that is open or closed, etc.; and system status, such as open circuit breakers, load on alternate source, etc.
See Event Masks on page 82 for instructions on setting the mask type via the touch screen display. See the 12.1.4 - Setting Event Masks with the Terminal on page 77 for instructions on configuration using the RS-232 port. 11.2 Event and History Logs The system tracks events through the Events Log and tracks significant events through the History Logs. These logs allow you to quickly spot trends or diagnose problems that the unit may have had. Both logs are written in nonvolatile memory.
The History Log has the following fields: • Replay Rate — indicates how long it takes for the replay to play. Use the UP and DOWN buttons to set the time. • Status — the status of the STS2 at the point of the current frame in the replay. The History log has three statuses: Frozen, Not Frozen and Retrieving Data, please stand by. • Critical Event — The event which triggered this log to be written. The event is indicated in red on the bar graph. • Frame Number — the current frame in the replay.
. Table 9 ID Event Messages Alarm Message Description/Cause Action 001 S1 SCR SHORT One or more of the SCRs for Source 1 have shorted and failed. D, F, A, E 002 S2 SCR SHORT One or more of the SCRs for Source 2 have shorted and failed. D, F, A, E 003 S1 SCR OPEN One or more of the SCRs for Source 1 is open. D, F, A, E 004 S2 SCR OPEN One or more of the SCRs for Source 2 is open.
Table 9 ID Event Messages Alarm Message Description/Cause Action 083 AUTO REXFER INHIBIT Automatic retransfer is inhibited. A, E 084 CB1 (S1) OPEN Source 1, Circuit Breaker 1 is open. A, E 085 CB2 (S2) OPEN Source 2, Circuit Breaker 2 is open. A, E 086 CB4 (S1 BYP) CLOSED Source 1 on bypass, Circuit Breaker 4 is closed. A, E 087 CB5 (S2 BYP) CLOSED Source 2 on bypass, Circuit Breaker 5 is closed. A, E 088 CB3 (OUTPUT) OPEN Output circuit breaker (CB3) is open.
12.0 COMMUNICATION INTERFACES The STS2 monitoring system offers several choices for communications. The RS-232 terminal port is standard on all units. The port is located inside the front door, to the left of the touch screen/LED front panel mounting as shown in Figure 29 on page 47. This port is primarily used as an alternate user interface to configure, control, and diagnose the system, especially for systems that do not include the HMI touch screen. Commands for the RS-232 port are shown in Table 10.
12.1.1 Connecting and Using a Terminal An RS-232 connection can be used to connect the STS2 to either a terminal or a PC running terminal emulation software. If you are unsure of the cable pin out, see 15.2.10 - Terminal Port Connections on page 111. 1. Connect the terminal to the STS2 by plugging the cable from the terminal into the RS-232 port. This connection can be made at any time. 2. After making the connection, verify the communications link by pressing on the terminal keyboard.
Table 10 Terminal Commands Keys Function TIME Sets system time UPMDR? Displays metering data VER? Displays firmware versions 12.1.2 Configuring the STS2 via the Terminal The SPT command is used to configure the systems setpoints. The SVT syntax for the setpoints consists for four parameters: SPT [group] [item] [value] where the parameters are: • SPT — is the terminal command that is used to configure setpoints. • group — the group under the setpoint command which contains the desired settings.
Value Parameter Item settings, depending on what they are, use various value types. Table 11 provides a list of the possible value types and their description. Table 11 Value Types Type Definition Numeric An integer numeric value in the units indicated by the item name. For example, a System Voltage Rating of 480 would indicate 480 volts. Scaled Similar to the Numeric, this value type is an integer that has been scaled, usually to remove decimal points that would normally appear within the value.
Table 12 Group Settings and Values Group Group 3: User Settings Group 4: Event Mask Settings Item: Description Value Type Value Notes 1 SRC1 Fast Undervoltage Setpoint Integer In % of nominal below nominal 2 SRC1 Slow Undervoltage Setpoint Integer In % of nominal below nominal 3 SRC1 Slow Undervoltage Detect Delay Integer In number of lines cycles 4 SRC1 Overvoltage Setpoint Integer In % of nominal above nominal 5 SRC1 Overvoltage Detect Delay Integer In 1/4 lines cycles 6 SRC1
The value parameter settings are in the form of a bit-packed word (in hexidecimal notation). In other words, each bit indicates a particular setting for the option or feature.
The bits are set in reverse order, from bit 15 on the left to bit 0 (zero) on the right. The bits are grouped in four sets of four bits each, as such: 0000 0000 0000 0000 |................................| bit 15.........................bit 0 Since each bit represents a setting, a bit can be enabled or disabled: • 1 = installed option or enabled feature – or – • 0 = option not installed or feature not enabled Enabling or disabling the bits in each group creates a binary value for that group.
In hex this equates to (digits in the value parameter cannot have spaces between them): 0081 So your command to indicate that the Remote Source Selection and the Dual-Output Breaker are installed would be: SPT 2 6 0081 12.1.4 Setting Event Masks with the Terminal The event masks can be customized via a terminal. The command SPT4? displays all faults and alarms, along with their associated event masks.
78 Communication Interfaces
13.0 STS2 TOUCH SCREEN DISPLAY The STS2 can be configured with a Color Graphical LCD touch screen display that allows you to quickly check the status of the unit and identify problems. A touch screen LCD is available through the front of the STS2. This screen provides a graphical (Mimic) display of the switch’s operation, plus system information including system parameters, alarms and faults. The LCD provides a color, back-lit touch screen as a user interface.
13.2 Menu Overview The touch screen menu provides access to configuration settings and more device information. The CONFIG (Configuration) and LOGS menus provide multiple choices through pop-up menus. The SOURCE XFER menu selection allows you to select the preferred source. The other menu choices provide information in the display panel. The menu choices are discussed later in this manual. All programmable functions are preset at the factory to default settings.
13.2.1 Security Because the STS2 Color Graphical Display provides access to various configuration and monitoring choices, a password or key lockout switch may be used to protect access to certain changes, including: • • • • Change configuration settings. Clear logs. Make a source transfer. Reset an alarm. Without entering the password or enabling changes with the key lockout switch, you still can: • • • • View the display, including the mimic, status and event help. View logs.
13.3 Mimic Display The Mimic display provides a color diagram of the operation of the STS2. This display imitates the power flow through the static transfer switch and indicates source status, breaker status, switch status, source voltage and current readings, output power measurements, and active alarm messages. See Figure 36 on page 79. 13.4 Event Controls The STS 2 detects events when certain thresholds are passed or certain problems occur.
To set the event masks: 1. Access the Event Mask dialog box: a. Select CONFIG. b. Select EVENT MASK from the pop-up menu. The Event Mask dialog box is displayed. See Figure 40. 2. Select the mask settings for each fault and alarm. a. Select YES to enable the setting, – or – b. Select NO to disable the setting. 3. Select SAVE to keep the settings. Figure 40 Event Mask Dialog Box User Settings The User Settings choice allows you to adjust the user-accessible switch settings.
Figure 41 User Settings Dialog Box Source Set Points The Source 1/2 Set Points allows you to configure trigger points for each input source (1 or 2) for the STS2 via a keypad dialog or HI/LO dialog box. The source numbers do not designate the source as the preferred or alternate source. The numbers simply identify the input source. See Manual Transfer / Preferred Source Selection on page 59 to set the preferred source.
Figure 42 Source Set Points 2. Select 1 to configure the settings for Source 1. 3. Configure the settings using the keypad or dialog box that is displayed when you touch a button. Table 14 Set Point Parameters Button Range Default Comments Fast UV Setting (%) -10 to -30% of Nominal voltage rating -20% Set in increments of 1%. Slow UV Setting (%) -5 to -20% -10% Set in increments of 1%.
9. 10. 11. 12. 13. 14. 86 deviation setting is the allowable frequency variation from nominal (60.0 or 50.0 Hz) before activating the frequency deviation alarm. The frequency setting applies to both input sources. a. Configure this setting with a range of 0.1 – 3.0 Hz The default setting is 0.5 and the resolution is 0.1. b. Select OK to save the setting. Select RETRANSFER DELAY. A keypad is displayed.
! CAUTION RISK OF EQUIPMENT DAMAGE AND PERSONNEL INJURY. USE OF AUTO RESTART IS SITE SPECIFIC. DO NOT ENABLE AUTO RESTART UNLESS THE INFRASTRUCTURE IS DESIGNED FOR UNATTENDED OPERATION AND THERE IS NO CHANCE OF EQUIPMENT OR PERSONNEL HARM BY AUTOMATIC RE-ENERGIZING OF THE SYSTEM. CONSULT WITH YOUR LIEBERT SITE ENGINEER AS TO WHETHER AUTO RESTART SHOULD BE ENABLED.
Figure 43 Comm Options Dialog Box Option buttons Configuring the Modem The Modem dialog box allows you to configure the optional, internal modem or an external modem that is connected to the static transfer switch. Only one modem can be utilized by the STS2. The dialog box contains a series of choices that access either a keypad or a secondary dialog to configure settings. Auto dial can also be configured for the modem to be triggered by events, as set up in the Event Mask choices.
Figure 44 Modem Dialog Box 2. Select the type of modem that the STS2 will be using: • Select INT if the STS2 will be communicating via an internal modem. • Select EXT if the STS2 will be communicating via an external modem. 3. Select the PRIMARY LINE choice to enter the primary telephone number for the modem to dial when an alarm is triggered. 4. Enter the number in the keypad dialog box. 5. Select OK to save the telephone number. The number is displayed in the field adjacent to the Primary Line choice. 6.
11. Configure the MODEM HEALTH CHECK. The Health Check verifies that the modem is working properly. This setting allows you to enable the check and set when it is run. a. Select the button to display the Modem Health Check dialog box, from which you can access further dialogs to set the time and days that the check is run. b. Select SAVE to keep the settings. The Health Check dialog box is closed and the Modem dialog box is again active. c.
Figure 45 Input Contact Isolator Dialog Box 2. Select INPUT CONTACT 1. A keyboard is displayed to allow you to enter the name of the alarm. 3. Enter the name of the alarm set for that input. For example, a fan problem could be indicated by naming the button FAN. 4. Select OK on the keyboard to keep your label. 5. Select DELAY. A keypad is displayed prompting you for a delay time, in seconds, for a condition to exist before the alarm is triggered. 6. Enter the delay value.
The STANDARD SET for the Programmable Relay Board settings are: Table 15 Standard Settings for Programmable Relays Relay Setting Definition 1 SOURCE 1 FAIL Source 1 failure. 2 SOURCE 2 FAIL Source 2 failure. 3 BYPASS CB4 CLOSED Switch (CB4) is closed, Source 1 is bypassed. 4 BYPASS CB5 CLOSED Switch (CB 5) is closed, Source 2 is bypassed. 5 TRANSFER INHIBIT A transfer between Source 1 and Source 2 is being restrained.
2. Select your configuration settings. • Select STANDARD SET to use the settings configured at the factory. See Go to step 4. • Select USER DEFINED SET to configure your own settings. Go to step 3. If you enter a user defined settings, this information is not saved if control power is removed. Record the settings in Programmable Relay Board Settings Record on page 3. 3. To define your relay board settings: a. Select a Programming Relay. b. Select an event you want associated with the relay.
Figure 47 System Options Dual Output Breaker This selection is set at the factory. The choice is set to YES to enable both output breakers (CB3 and CB3A) when two are installed in the unit. If only one output breaker (CB3) is installed, the setting is set to NO. PDU This selection is set at the factory. This setting allows the LCD to draw the Mimic accordingly and display PDU specific metering and alarm information.
System ID Most of the settings for System ID are set by Liebert either at the factory or when the unit is installed. Order No., System Tag No., System ID No. and Model No. are the numbers used to identify and track the system. Language, Time and Date are synchronized with the location of the unit. The only configurable field is the Password. See Using the Password on page 81 for more information on configuring and using the password. 13.6.
Figure 49 History Log To use the History Log: 1. Select LOGS from the menu bar to open the Logs menu. 2. Select either HISTORY LOG 1 or HISTORY LOG 2 from the menu. 3. Select the appropriate buttons to replay the log: • Select PREV to go to the previous frame in the sequence. • Select NEXT to go to the next frame in the sequence. • Move the green cursor to the location from which you would like to play the sequence of events. • Select REPLAY to play the frames automatically from the point of the cursor.
13.6.6 Help You can select an event in the Event Display to display more information about that event in the Display Panel. This same help is also available in 16.0 - Event Message Help Text on page 113. 13.6.7 Logo The Logo menu choice shows the Liebert and Emerson logo in the Display panel. 13.7 Cleaning the LCD Touch Screen If the touch screen requires cleaning, use a pre-moistened towelette designed for cleaning CRTs, or dampen a soft, non-abrasive cloth with a very mild cleaning solution.
98 STS2 Touch Screen Display
14.0 OPERATING THE LED DISPLAY STS2 Certain models of the STS2 do not include the LCD Color Graphical Display with the touch screen interface. This display is replaced by an LED front panel to allow you to monitor the unit and alert you when a problem occurs. The LED panel can be replaced with the Color Graphical Display, if desired. Instructions for using the LCD are in 13.0 STS2 Touch Screen Display on page 79.
Figure 50 Front Panel LEDs and Buttons 1 ~ ~ 1 (IN1A) (CB4) 1 (STS1) ~ ~ (IN1B) (CB1) 4 I (SW_PREF1) (LED_PREF1) ~ (NOXF) 2 (SW_PREF2) (LED_PREF2) ~ (IN2A) 3 3A ~ 2 (CB3) (OUT) (CB3A) II ~ ~ (IN2B) 2 (CB2) (STS2) 5 (CB5) Key: 1 = Input Source 1 2 = Input Source 2 3 = Output 3a = Output, dual system 4 = Input Source 1 Bypass 5 = Input Source 2 Bypass (ITALICS) = Components. LEDs are defined in Table 16 on page 101. Buttons are defined in Table 17 on page 102.
14.1.3 LED Definitions The following table defines what item that these LEDs monitor: Table 16 LEDs—Defined LED Item Monitored Action IN1A Source 1 input present A green LED is lit if the Source 1 input power is present. This LED only indicates that power is present to the power supply; it does not indicate if the power is within the programmed tolerances of the unit. IN2A Source 2 input present A green LED is lit if the Source 2 input power is present.
Table 16 LEDs—Defined LED Item Monitored ALRM Alarms Action A red LED is lit when an alarm condition is present in the STS2. Connect a PC terminal to the STS2 to locate the exact cause. See Communication Interfaces for PC terminal commands. 14.1.4 Button Definitions The following table defines the buttons illustrated in Figure 50 and Figure 51. Table 17 Push button Switches—Defined Button SW_PREF1 Definition Source 1 Preferred Action Push this button to select Source 1 as the preferred source.
14.2 Operations This section discusses the system turn-on, shut-down and bypass procedures for LED-based STS2. If your unit has an LCD touch screen, see 10.0 Operating Instructions for the Touch Screen Interface on page 58 for instructions these procedures. 14.2.1 Normal System Turn-On NOTE If your STS2 is connected to a PDU with a Wye configuration, enable the Wye Output Transformer before starting the system. This configuration can be done from a PC terminal. Refer to 12.
14.2.2 Manual Transfer / Preferred Source Selection The preferred source buttons allow you to change the preferred source. Transfers are only permitted when the voltage and current are within their proper operating range and the sources are synchronized. Transfer is inhibited if the deviation exceeds the parameter set in the Source Set Points. NOTE If one source will be de-energized for an extended period (hours or days), set the unit to bypass mode for the remaining source.
4. 5. 6. 7. 8. 9. 10. 11. Rotate and remove the interlock key. Insert the key into the CB4 bypass breaker interlock. Rotate interlock keys in the CB4 bypass breaker interlock to retract the interlock. Close bypass breaker CB4. The LED for CB4 turns on. Open source input breaker CB1. Rotate the interlock key and remove it to lockout the breaker. The LED for CB1 turns off. Open the output breakers CB3 and CB3A (if supplied) to remove power from static switch. The LEDs for CB3 and CB3A (if supplied) turn off.
To return to normal mode: 1. Verify that the LEDs for Source 2 are on, indicating that the source is supplying power and is operating within acceptable tolerances. 2. Insert key in the CB2 breaker interlock. 3. Rotate key to retract interlock. 4. Close source input breaker CB2. The LED for CB2 is turned on. 5. Close output breakers CB3 and CB3A (if supplied). The LEDs for CB3 and CB3A (if supplied) turn on. 6. Open bypass breaker CB5. The LED for CB5 is turned off. 7.
15.0 SPECIFICATIONS This section provides the specifications for the STS2. 15.1 System Configuration The STS2 can be set in several different configurations, according to the model and location. The configuration is set at the factory and does not need to be changed by the customer. These configurations apply to both units, the Color Graphical Display and an LED Display. 15.1.1 Frequency The STS2 accepts input frequencies of 50 Hz and 60 Hz. The frequency shall be within +/- 0.
15.1.4 Grounding Refer to 5.3 - System Grounding on page 15 for specifications and instructions regarding grounding. 15.1.5 Electrical Requirements Table 20 Electrical Requirements Item Requirement Maximum Continuous Current 100, 250, 400, 600, 800, 1000 amps Load Power Factor Range 0.75 to 1.0, leading or lagging Load Crest Factor Up to 3.
15.2 System Components All STS2 models provide two static transfer switches within one enclosure, with the ability to transfer between two input sources to a single output. All STS2s are configured with either an LCD Color Graphical Interface touch screen display or LEDs for monitoring and configuring the unit. This section lists the common components and the differences for both types of units. 15.2.1 Frame and Enclosure The complete STS2 is housed in a freestanding enclosure.
15.2.4 Access The STS2 is designed so all repairs and maintenance can be done from the front or top of the unit. All components that may need repair or replacement during routine field maintenance are safely accessed with the units in bypass without removing power from the unit.
15.2.8 Color Graphical Display or LED Display The display is located in the front of the unit. Front panel display is either an LCD touch screen display for monitoring and configuring the unit, or an LED panel to monitor the unit's status. See Figure 31 on page 49 for a drawing of the touch screen display. See Figure 50 on page 100 for the layout of the LED display. 15.2.9 RS-232 Port The unit is equipped with an RS-232 port for connecting a terminal or PC. See Figure 29 on page 47 for the port’s location.
15.2.11 RS-232 Interface Parameters The service terminal interface parameters are the following settings and cannot be changed. Table 25 RS-232 Settings Parameter Setting Interface RS-232 Using EIA Voltage Levels Baud Rate 9600 Parity None Number of Data Bits 8 Number of Stop Bits 1 Hardware Flow Control Off Terminator Handshaking Not supported Structure Full duplex Local Echo Off 15.2.
16.0 EVENT MESSAGE HELP TEXT Key: ALL CAPS = event message displayed in the Event Display panel in the lower left corner of the LCD display. Indented text = help text shown in the Display Panel in the lower right corner of LCD display. BOLD = commands that are sent through the RS-232 port. S1 SCR SHORT Source 1 SCR Short. One or more of the SCRs for Source 1 has shorted. Transferring between sources has been inhibited. Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378).
S2 SCR OPEN Source 2 SCR Open. One or more SCRs on Source 2 is open. Transferring between sources has been inhibited. STS2 output has been transferred to Source 1. Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
PWR SPLY DC A FAIL Power Supply DC Bus A Failed The primary power supply is no longer providing DC power to the control board and the touch screen. Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support.
PWR SPLY S2 AC FAIL Power Supply Source 2 AC Failed The AC input power to the power supplies from Source 2 has failed. The power supplies are now operating on AC power from Source 1. The AC input from Source 2 is still good. Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area.
S1 VOLT SENSE FAIL Source 1 Voltage Sense Module Failed The module contained on the snubber monitoring the input voltage from Source 1 has failed. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378).
S2 SCR SENSE FAIL Source 2 SCR Sense Module Failed The module contained on the snubber monitoring the SCRs for Source 2 has failed. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378).
Contact technical support; in the United States, call 1-800-LIEBERT (1-800-543-2378). Outside the 48 contiguous United States contact Liebert Global Services, if available in your area. For international areas not covered by Liebert Global Services, the Liebert authorized distributor can provide technical support. This event was written to the Event Log, if so configured. The alarm has triggered a message to be sent to the modem, if so configured.
This event was written to the Event Log, if so configured. The alarm has triggered a message to be sent to the modem, if so configured. If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. CB1 SHUNT TRIP FAIL Circuit Breaker 1 Shunt Trip Failure Circuit Breaker 1 failed to trip open when the control issued a command for the circuit breaker to trip.
S1 UV Source 1 Under Voltage (fast detection). The input voltage from Source 1 dropped below a set percentage of the nominal voltage, as set in the Fast UV set point under the User Settings. An S1 Fail alarm was also issued and source transfer has been inhibited. The load of the STS2 has been transferred to Source 2. Press SILENCE on the touch screen to turn off the audible alarm, if so configured.
S1 OF/UF Source 1 Over Frequency/Under Frequency The frequency for Source 1 is running outside the acceptable operating range, as set in the Frequency Trip Point under User Settings. An S1 Fail alarm was also issued and source transfer has been inhibited. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. The alarm is latched and must be reset after the voltage returns to the nominal voltage. If the Reset option is not configured for AUTO (automatic reset), then the reset action must be done manually. When the voltage is within acceptable parameters, touch the RESET button on the touch screen.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. S1 OVERCURRENT Source 1 Overcurrent STS2 is running on Source 1 and an overload condition has occurred on one or more phases. Note: The overload setpoint is a single fixed number--101%. An overload condition is detected when the measured load current is equal to or greater than the setpoint.
If this alarm is set for manual reset mode, the alarm continues to show as active after the current returns to nominal, still inhibiting transfers. You will need to manually reset the alarm. If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. The alarm has triggered a message to be sent to the modem, if so configured.
Pressing the RESET button to returns the unit to the preferred source. Ensure that the condition that triggered the switch has been rectified before returning to the preferred source. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured. If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. CB4 (S1 BYP) CLOSED Circuit Breaker 4 (Source 1 Bypass Breaker) Closed Circuit breaker 4 is not open. The input from Source 1 is bypassing the static transfer switch. Press SILENCE on the touch screen to turn off the audible alarm, if so configured.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. This event was written to the Event Log, if so configured. The alarm has triggered a message to be sent to the modem, if so configured. If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. OUTPUT UV Output Undervoltage The voltage being supplied to the load has dropped below the acceptable nominal voltage. Check the input voltage from both sources. This event and the system status surrounding it have been written to a History Log if the History Logs were not already full. This event was also written to the Event Log, if so configured.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. The event, with its assigned name, was written to the Event Log, if so configured. The alarm has triggered a message to be sent to the modem, if so configured. If configured to be a latching alarm, press RESET on the display.
INPUT CONTACT #7 Input Contact Isolator #7 Occurrence of the indicated external event has been detected by Input Contact Isolator #7 of the Open Comms Digital Input option board. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm. The event, with its assigned name, was written to the Event Log, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. TIME REPROGRAMMED System Time Reprogrammed The system’s time setting has been updated and saved. Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the STS2 system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard. HIST LOGS FULL History Logs Full The history buffer has reached its capacity for both history logs. No further history logs can be written until the logs are cleared. The History Logs were frozen by the occurrence of two designated faults or alarms. Both history logs have been frozen by significant events.
134 Event Message Help Text
17.0 MAINTENANCE ! WARNING ONLY QUALIFIED SERVICE PERSONNEL SHOULD PERFORM MAINTENANCE ON THE STATIC SWITCH. LETHAL VOLTAGES EXIST INSIDE THE UNIT DURING NORMAL OPERATION. THE UNIT IS SUPPLIED BY MULTIPLE AC POWER SOURCES. DISCONNECT AND LOCK-OUT ALL POWER SOURCES BEFORE WORKING INSIDE UNIT. Minimal periodic maintenance of the STS2 is required.
17.4 Contacting Liebert To contact Liebert Global Services in the United States for information or repair service , call 1-800-LIEBERT (1-800-543-2378). Liebert Global Services is available to assure fast repair of your unit with minimal downtime. Liebert Global Services offers a complete range of start-up services, repair services, preventive maintenance plans, and service contracts.
POWER PROTECTION 6WDWLF 7UDQVIHU 6ZLWFK INSTALLATION, OPERATION & MAINTENANCE MANUAL The Company Behind the Products With over a million installations around the globe, Liebert is the world leader in computer protection systems.
