A900-9025N Revised 10-99 Section 40 (00-02-0197) SERIES A900 MURPHYMATIC® GENERATOR ENGINE CONTROL SYSTEM DESIGN, INSTALLATION AND OPERATING MANUAL DIS CO NT INU ED
Certain danger to human safety and to equipment may occur if some equipment is stopped without prewarning. It is recommended that monitored functions be limited to alarm-only or to alarm before shutdown. DIS WARNING CO NT INU ED BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT ✔ Disconnect all electrical power to the machine. ✔ Make sure the machine cannot operate during installation. ✔ Follow all safety warnings of the machine manufacturer. ✔ Read and follow all installation instructions.
Table of Contents Section 1: Introduction 1-1 System 1-2 Models 1-3 Purpose 1-4 Definitions 1-5 How To Use This Manual page 1 1 1 1 1 1 Section 2: Specifications 2-1 Enclosure Type 2-2 Power Requirements 2-3 Input Ratings 2-4 Output Ratings 2-5 Field Wiring Connections 2-6 Operating Temperature 1 1 1 1 1 1 1 Section 3: Model Identification 3-1 Model Numbers 3-2 A901 3-3 A901-2 3-4 A902 3-5 A902-2 3-6 A903 3-7 A903-2 1 1 2 5 7 8 10 12 Section 4: Installation 4-1 Location 4-2 Wiring 4-3 Crank Disconnect
Section 1: Introduction 1-1 System. 1-1.1 The MURPHYMATIC® Generator Engine Control System, Series A900 is designed to meet the requirements of the engine control, shutdown and alarm section of NFPA-110 “Emergency And Standby Power Systems” specification. The controller also meets the minimum requirements of NFPA99 “Health Care Facilities” and the Canadian standard CAN/CSA-C282-M89 “Emergency Electrical Power Supply for Buildings” for engine control, shutdown and alarm systems.
an automatic-start, two-cycle, engine-driven generator, and include the shutdown and alarm points recommended in NFPA110-1988 “Emergency and Standby Generator Systems” for Level 1 installations. These controllers also meet or exceed the minimum requirements of NFPA-99-1990 “Health Care Facilities” and with the addition of a Low Water Level alarm, the Canadian standard CAN/CSA-C282-M89 “Emergency Electrical Power Supply for Buildings”.
CAN/CSA C282-M89 A901 ④ ④ ④ X X X X X X — X X X — — X X X X X X X X X X X X X X — X X — X X — X — — X — — — — — X X — X — — X — X X X X — — — — — — X — — — X — X KEY C.V.: Control panel-mounted Visual indication. S: Shutdown of EPS L.A.: Local Audible contacts. R.A.: Remote Audible contacts. R.V.: Remote Visual contacts. X: Required O: Optional g. Overpeed h. Low Fuel Main Tank i. Control Switch not set in Auto j. High Battery Voltage k. Low VoltageBattery l. Lamp Test m.
(d) Overcrank circuit; will stop automatic cranking and indicate overcrank if engine fails to start after 3 attempts. The number of cranks are selectable for 1, 2, 3, 4 or 5 cycles before shutdown. The overcrank circuit may also be turned off so no overcrank shutdown occurs. (e) Shutdown Time Delay Bypass; this delay prevents the oil pressure, water temperature and loss of speed signal shutdown circuits from operating for 15 seconds after the engine starts as detected by the crank disconnect circuit.
energize the battery charging alternator field. 3-2.2.2 Shutdown Relay; this relay is operated by the shutdown circuits of the Control / Display Module and provides an output that can be used to trip the generator circuit breaker on an emergency shutdown. 3-2.2.3 Local Audible Alarm Relay; provides a contact closure to operate a local audible alarm as required by NFPA-110, Level 1 and Level 2. 3-2.2.
(f) Overspeed Speed Switch; 1. Provides a signal to the overspeed shutdown circuit if the engine exceeds the preset speed. The factory setting is approximately 3894 Hz, or 1980 RPM on an engine with 118 teeth on the flywheel ring gear. The adjustment range is 300 Hz to 10,000 Hz. 2. A push to test switch is provided to allow testing of the overspeed circuit without overspeeding the engine. When switch is depressed, the set point of the speed switch is lowered approximately 10%. 3.
to operate a local audible alarm as required by NFPA- 110, Level 1 and Level 2. 3-3.2.5 Remote Audible Alarm Relay; provides a contact closure to operate a remote audible alarm as required by NFPA110, Level 1. 3-3.2.6 Remote Visual Alarm Relay; provides a contact closure to operate a remote visual alarm as required by NFPA- 110, Level 1. 3-3.3 Status Signals. The relay module also includes three outputs that can be used with external circuits for signaling or control functions. 3-3.3.
setting until the overspeed trips. When switch is released, the set point will be 10% above normal running speed. This is the method used to make the factory setting. With engine speed at 1800 RPM or 3540 Hz. (g) Cooldown circuit; this circuit keeps the engine running for five minutes after the transfer switch has removed the load from the generator and signaled the A902 to stop the engine.
6-1/2 in. (165 mm) 9-3/4 in. (248 mm) Low Water Temperature Overcrank Loss of Speed Signal Overspeed Lamp Test Oil Pressure AUTO Water Temperature OFF TEST Air Damper Closed be turned off so no overcrank shutdown occurs. (e) Shutdown Time Delay Bypass; this delay prevents the oil pressure, water temperature and loss of speed signal shutdown circuits from operating for 15 seconds after the engine starts as detected by the crank disconnect circuit. (f) Overspeed Speed Switch; 1.
of cause of alarm. These circuits activate the alarm relay. Alarm circuits are active as long as power is applied to the A902-2. All are active when the engine is running, shutdown or on standby. Two (2) Amber Alarm Indicating Lights are provided. (a) Low Water Temperature; operated by low water temperature SWICHGAGE®. (b) Air Damper Closed; operated by an external switch or by the Overspeed Relay circuit.
3-6.1.2 Lamp Test Pushbutton: Tests the lights on the A903 module. 3-6.1.3 Alarm Silence Pushbutton: Turns off any audible alarm that is connected to the Local or Remote Audible Alarm Relays. The indicating light will remain on as long as the condition exists. If the Alarm Silence pushbutton is not operated, the audible alarm will turn off when the alarm contact clears. 3-6.1.
(h) #8 Spare Alarm; operated by an external switch. This circuit is provided for an additional alarm that may be required by the user. (i) #9 Spare Alarm; operated by an external switch. This circuit is provided for an additional alarm that may be required by the user. 3-6.2 Relay Module. The Relay Module, figure 3-6.2, includes all of the control, alarm and shutdown relays that are required to make up the generator engine control. Relays are available for operation on either 12 or 24 volt battery systems.
audible alarm will turn off when the alarm contact clears. 3-7.1.4 The A903-2 SELECTRONIC® Control Module includes the following engine control features: (a) Cycle crank circuit; will crank the engine for 15 seconds then rest for 15 seconds until the engine starts. The crank/rest time is selectable for either 10, 15, 20, 25 or 30 seconds. If the engine false starts, goes above crank disconnect speed then drops below that speed, the control will rest for a fixed 10 second period before cranking again.
make up the generator engine control. Relays are available for operation on either 12 or 24 volt battery systems. Four (4) relays are included for: 3A Fuse 1A 4 5 DC12V DC12V 16 6 17 7 18 8 19 9 6-1/4 in. (159 mm) 20 DC12V 21 22 23 24 Section 4: Installation 4-1 Location. 4-1.1 The A900 series is designed to mount in a MURPHYMATIC® Generator Control panel with the Control / Display module on the front panel and the Relay module on the inside bottom surface.
Figure 4-1.2.5: Mounting Dimensions 6 in. (152 mm) 3 in. (76 mm) 2-13/16 in. (71 mm) A900 Series Module 5-5/8 in. (143 mm) 1-1/2 in. (38 mm) clearance Mounting Holes 1/8 in. (3 mm) diameter DIS CO NT INU ED 6-3/4 in. (171 mm) 9-3/8 in. (238 mm) 3-3/8 in. (86 mm) 4-15/32 in. (114 mm) 5 in. (127 mm) maximum between A-900 Series module & relay module when mounting Relay Module 3/16 in. (5 mm) dia. 4 places 5-1/2 in. (140 mm) 3-3/4 in. (95 mm) 1-7/8 in. (48 mm) clearance 1-7/8 in.
Figure 4-2.3.1: A901 wiring Hourmeter Voltmeter Input Barrier Terminal Blocks 15 26 4 27 28 4 29 30 31 32 33 34 Remove jumper from 4 and 27 to use manual start switch Output Barrier Terminal Blocks AUTO START MODULE ALARM SILENCE 35 B+ OUT HOURMETER BMANUAL START START PICKUP PICKUP OIL PRESSURE LO WATER TEMP. HI WATER TEMP. REMOTE S.D. SPARE ALARM AUDIBLE ALARM OVERCRANK OVERSPEED OIL PRESSURE HI WATER TEMP. REMOTE SHUTDOWN SPARE SHUTDOWN LOSS OF SPEED LO WATER TEMP.
Figure 4-2.3.2: A902 wiring Hourmeter Voltmeter Input Barrier Terminal Blocks 15 26 4 27 28 4 29 30 31 32 33 34 Remove jumper from 4 and 27 to use manual start switch AUTO START MODULE ALARM SILENCE 35 B+ OUT HOURMETER BMANUAL START START PICKUP PICKUP OIL PRESSURE LO WATER TEMP. HI WATER TEMP. REMOTE S.D. SPARE ALARM AUDIBLE ALARM OVERCRANK OVERSPEED OIL PRESSURE HI WATER TEMP. REMOTE SHUTDOWN SPARE SHUTDOWN LOSS OF SPEED LO WATER TEMP.
Figure 4-2.3.3: A903 wiring Hourmeter Voltmeter Input Barrier Terminal Blocks 15 26 4 27 28 4 29 30 31 32 33 34 Remove jumper from 4 and 27 to use manual start switch AUTO START MODULE ALARM SILENCE 35 B+ OUT HOURMETER BMANUAL START START PICKUP PICKUP OIL PRESSURE LO WATER TEMP. HI WATER TEMP. REMOTE S.D. SPARE ALARM B+ Output Barrier Terminal Blocks 36 37 38 39 40 41 42 43 44 45 46 AUDIBLE ALARM OVERCRANK OVERSPEED OIL PRESSURE HI WATER TEMP.
current rating that is equal to or greater than the forward current that the coil draws to operate. For example, a relay less than 1 A, use a 1 A diode since they are readily available. The wiring shown in Figures 4-2.3.1, 4-2.3.2 and 4-2.3.3 have examples of the places that a reverse diode is required. 4-3 Crank Disconnect. 4-3.1 A magnetic pickup is recommended to supply the speed signal for the A900 series primary crank termination circuit and for the overspeed switch.
Figure 4-4.1.3 Fuel Relay Torque Scews to 12 In./lb. Torque Scews to 12 In./lb. 15 35 Crank Relay 26 04 27 28 SW1 = 10 s. SW2 = 15 s. SW3 = 20 s. SW4 = 25 s. SW5 = 30 s.
(c) “Water Temperature” light will come on and engine will stop. (d) Turn Mode Selector switch OFF. 4-4.9 Low Water Temperature; to test the low water temperature alarm circuit: (a) Engine does not have to be running. (b) Use a jumper wire and short from terminal 31 to 4. (c) “Low Water Temperature” alarm light will come on as long as the jumper maintains the circuit. 4-4.10 Other Alarm and/or Shutdowns; all other alarms and shutdowns would be tested in the same manner.
22 27.6 13.8 13.8 0 13.8 0 13.8 0 0 0 13.8 13.8 13.8 0 13.8 6 .3 0 13.8 0 0 0 0 0 0 13.8 0 0 0 0 1 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 (1) 30 (2) 13.8 0 13.8 0 13.8 0 0 0 13.8 0 0 0 13.8 6 .3 0 13.8 13.8 0 13.8 0 13.8 0 13.8 0 5.5 0 0 13.8 Input 27.6 0 27.6 0 27.6 0 0 0 27.6 0 0 0 27.6 6 .3 0 27.6 27.6 0 27.6 0 27.6 0 27.6 0 5.5 0 0 27.6 Voltage Mode Selector AUTO Stand-by 13.8 0 0 13.8 0 13.8 0 0 13.8 0 0 0 13.8 6 13.8 13.8 1.5 13.8 0 13.8 0 13.8 0 0 0 .
to the table for examples. (c) Voltages less than battery also may vary due to tolerances of the electronic components in the A900. Minor variations, 1 or 2 volts, normally will have no effect on the A900 operation. (d) The AC voltage at terminal 29 must be a minimum of 2 VAC to drive the speed sensing circuits of the A900. 7-2.2 With power applied and the Mode Selector switch in AUTO, the following occurs when a switch is closed from terminal 28 to ground. 7-2.2.
local audible (K-4) terminal 20 and 21, remote audible (K-5) terminal 22 and 23 and remote visual (K- 6) terminal 24 and 25 close to operate the alarm devices wired to them. 7-3.3 An alarm silence pushbutton is wired between terminal 35 and ground. This switch is provided on the A901 and can be externally connected on the A902 series. When this switch is closed, the audible alarm relays K-4 and K-5 will drop out if they are closed.
DIS CO NT INU ED In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time. E RE GI D FWMurphy STER Printed in U.S.A. P.O. Box 470248 Tulsa, Oklahoma 74147 USA (918) 627-3550 fax (918) 664-6146 e-mail sales@fwmurphy.com www.fwmurphy.com CONTROL SYSTEMS & SERVICES DIVISION P.O. Box 1819; Rosenberg, Texas 77471; USA (281) 342-0297 fax (281) 341-6006 e-mail sales@fwmurphy.com FRANK W. MURPHY, LTD.
