MGE UPS Systems S3 - Manual (Page 54)

Before the inverter system can be turned on with the DC
circuit breaker on the front panel, the DC power source must
be energized.
Upon turning the DC circuit breaker ON, a
relay will energize and the cooling fan will start to operate
after a short delay of less than one second. The Inverter
STATUS indicator will go through a RED, YELLOW, GREEN
lamp test sequence. The Bypass STATUS indicator will not
be illuminated.
After another short delay (less than 2
seconds) a "chirp" sound should be heard from the Inverter
as the Battery Booster circuit starts up. The Inverter status
indicator should turn GREEN indicating power is being
supplied to the output. Using a voltmeter, verify the proper
output voltage at the Receiver Cabinet terminal board,
between ACOUT "L" and "N" terminals.
If the Inverter
STATUS indicator is YELLOW, an overload condition exists.
If it is RED, the Inverter has shut down, either from a severe
overload or Inverter malfunction.
If the Inverter STATUS
indicator should be YELLOW or RED, turn the DC circuit
breaker OFF and disconnect the load wires from the ACOUT
terminal block.
Turn the DC circuit breaker back ON and
verify the Inverter goes through its normal start-up sequence
(lamp test, battery booster start-up). The Inverter STATUS
indicator should be GREEN.
If it is GREEN, a problem
probably exists in the output load. First verify the Inverter's
output voltage by using a voltmeter to check the AC output
voltage on the ACOUT terminal board. Verify that a short
does not exist between the Line and Neutral wires and that
the load does not exceed the rating of the Inverter.
4.4.2 Basic Inverter
System (List 11, -B2
Models)
4 — 4 Maintenance and Service 86-153061-00
Topaz S3 Inverters 0.5 kVA, 1 kVA, & 2 kVA