Specifications

ManualsBrandsEmerson ManualsSwitchLiebert Static Transfer Switch

SL-20610 (R 11/02) 1

CSI 16262 - Static Transfer Switches

Liebert Static Transfer Switch 2

Automatic Static Transfer Switch

GUIDE SPECIFICATIONS

for 100A – 1000A

1.0 GENERAL

1.1 SUMMARY

These specifications describe the requirements for an automatic static transfer switch (STS). The STS is a

solid-state, three-pole, dual-position transfer switch designed to automatically and manually switch

between two synchronized three-phase AC power sources without an interruption of power to the load

longer than 1/4 cycle. The input power shall be supplied from two different AC power sources, which are

nominally of the same voltage level, phase rotation, and frequency. The primary purpose of the STS is to

allow virtually uninterrupted transfer from one source to the other in case of failure of one source or by

manual initiation for test or maintenance. The switching action shall not connect together the two sources

of power that would allow back feeding one source to the other. The STS shall allow for either source to

be designated as the “preferred source” to which the switch will automatically transfer to and remain

transferred to until manually initiated to transfer or until the selected source fails, at which time, the STS

shall transfer without interruption greater than 1/4 cycle to the other source, or “alternate source”. The

STS shall be furnished with key-interlocked static switch isolation and bypass breakers to each source

which allow uninterrupted manual transfer to and from either source for maintenance.

1.2 STANDARDS

The specified system shall be designed, manufactured, tested, and installed in accordance with:

• American National Standards Institute (ANSI)

• Canadian Standards Association (CSA)

• Institute of Electrical and Electronics Engineers (IEEE)

• ISO 9001

• National Electrical Code (NEC)

• National Electrical Manufacturers Association (NEMA)

• National Fire Protection Association (NFPA)

• Underwriters Laboratories (UL) (ULc)

• EN 50091-2

• EN 61000-6-3 & 6-2

• EN 60947-6-1

• IEC 62310

Summary of content (13 pages)

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CSI 16262 - Static Transfer Switches Liebert Static Transfer Switch 2 Automatic Static Transfer Switch GUIDE SPECIFICATIONS for 100A – 1000A 1.0 GENERAL 1.1 SUMMARY These specifications describe the requirements for an automatic static transfer switch (STS). The STS is a solid-state, three-pole, dual-position transfer switch designed to automatically and manually switch between two synchronized three-phase AC power sources without an interruption of power to the load longer than 1/4 cycle.
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Liebert Static Transfer Switch The STS shall be UL and UL listed per UL Standard 1008 for Automatic Transfer Switches. The STS shall comply with the latest FCC Part 15 EMI emission limits for Class A computing devices and the emission limits of EN50091-1, 2, 3 Class A. The STS shall safely withstand without misoperation or damage: • Transient voltage surges on either AC power input as defined by ANSI/IEEE C62.
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100 – 1000 Amps settings. All setting must be adjustable; the settings shall be adjusted/configured from the LCD display. A. Normal Mode. The unit is fed by two sources with the output connected to the load. In normal operation, the load shall be connected to the preferred source as long as all phases of the preferred source are within the acceptable limits.
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Liebert Static Transfer Switch components without access to hazardous voltages when the unit is in maintenance bypass. 1.4.3 Performance Requirements A. Nominal Input/Output Voltage: [(200) (208) (220) (240) (380) (400) (415) (480) (600) ( )] volts three phase, [(3) (4)]-wire-plus-ground. B. Voltage Range: +10%, -10% of nominal C. Frequency: (50) (60) Hz. +/-0.5 Hz D. Maximum Continuous Current: [(100) (250) (400) (600) (800) (1000)] amps E. Load Power Factor Range: 0.75 to 1.0, leading or lagging. F.
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100 – 1000 Amps hours. To the fullest extent practical, redundant circuits and components shall be used to eliminate single points of failure. 1.4.5.2 Power Supply Redundant power supplies shall be provided to prevent any single-point power supply failure mode. The STS shall have two completely separate power supplies mounted on separate boards so a power supply can be replaced while the load is on bypass.
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Liebert Static Transfer Switch • Description of equipment to be furnished, including deviations from these specifications. 1.5.3 Delivery Submittal Submittals upon STS delivery shall include a complete set of submittal drawings and one (1) installation, operation and maintenance manual that shall include a functional description of the equipment with block diagrams, safety precautions, instructions, step-by-step operating procedures and routine maintenance guidelines, including illustrations. 1.5.
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100 – 1000 Amps Provision shall be made for power and control cables to enter or leave from the top or bottom of the STS cabinet. 2.1.3 Frame and Enclosure The STS unit comprises of solid-state, three-pole, dual-position transfer switch, key-interlocked static switch isolation and bypass breakers, shall be housed in a single free-standing NEMA type 1 enclosure and meet IP20 requirements. The frame shall be constructed of galvanized steel and pop riveted to provide a strong substructure.
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Liebert Static Transfer Switch The STS shall be equipped with 5 molded-case, plug-in, non-automatic circuit breakers. The breakers shall be UL listed and IEC rated for use at the system voltage. The plug-in feature of the breaker shall include interlock, which prevents the breaker from being unplugged without being in the “Off” (open) position. Three of the breakers shall provide for total isolation of the solid-state switching devices with an input breaker for each source and a load isolation breaker.
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100 – 1000 Amps 2.2.2.
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Liebert Static Transfer Switch An audible alarm shall be activated when any of the alarms occurs. All alarms shall be displayed in text form. 2.3 ACCESSORIES (OPTIONAL COMPONENTS AND SERVICES) 2.3.1 Programmable Relay Board A Programmable Relay Board with eight sets of isolated Form C contacts shall be provided to indicate a change of status of any of the alarm conditions. Any alarm can be programmed onto any channel or channels. Up to two Programmable Relay boards can be installed in the STS2.
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100 – 1000 Amps software to communicate (via SNMP and HTTP) to any I.P.-based Ethernet network through a RJ-45 connector. The NIC shall provide 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 and HTTP. A terminal block shall be provided to connect to Modbus. 2.3.
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Liebert Static Transfer Switch 2.3.12 Export Crating Heavy-duty solid wood crating with vapor barriers and desiccant shall be provided to meet international requirements regarding package strength and markings for overseas shipments. 3.0 EXECUTION 3.1 FIELD QUALITY CONTROL The following inspections and test procedures shall be performed by factory-trained field service personnel during the STS startup. 3.1.
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100 – 1000 Amps throughout the country. Recommended spare parts shall be fully stocked by local field service personnel with back up available from national parts center and the manufacturing location. The national parts center Customer Support Parts Coordinators shall be on-call 24 hours/day, 7 days/week, and 365 days/year for immediate parts availability.