Panel-mounted items

DOE-SPEC-3021-97

Inverter protection. Protective devices connected in the inverter

3.5.1.6

output circuit to protect the Owner's uninterruptible ac bus against

excessive voltage and frequency variations, overvoltage,

undervoltage, over-frequency, and under-frequency. These

protective devices shall trip the inverter off the line after a time

delay, to override transients and initiate transfer of the Owner's

uninterruptible ac bus to the internal bypass supply.

Cooling failure alarm. A forced-air cooling system failure alarm.

3.5.1.7

3.5.1.8

Alarm indicators. Local indication of any alarm condition detected

by the UPS system by lights and local annunciator. In addition,

provide a single form-C type contact that operates on any alarm for

the Owner's remote annunciation.

3.5.1.9

Relay contacts. All alarm and protective-relay contacts rated 12 or

24 Vdc, 5-A make-and-carry, and 1.1-A noninductive interrupting

duty.

Panel-mounted items. Provide the following items and quantities and mount on

3.5.2

the instrument panel of the UPS system:

ATTENTION:

Identify any instrument accuracy or resolution required by specific application.

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a. 1 dc voltmeter

b. 1 dc ammeter

c. 1 input ac ammeter [with phase-selector switch]

d. 1 input ac voltmeter [with A-B, B-C, C-A phase-selector switch]

e. 1 output ac ammeter [with phase-selector switch]

1 output ac voltmeter [with phase-selector switch]

g. 1 output frequency meter

h. 1 synchronizing verification light

1 indicating lamp each for UPS load on NORMAL, STATION BATTERY, and

BYPASS

1 indicating lamp for LOW DC VOLTAGE

k. 1 inverter capacitor charge-discharge switch (if required)

1 indicating lamp or other alarm for FORCED AIR COOLING SYSTEM

FAILURE, if forced air cooling is provided