MGE UPS Systems S3 - Manual (Page 58)

SYMPTOM POSSIBLE CAUSE RECOMMENDED PROCEDURE
terminals and that the proper AC output
voltage exist on the AC output terminal
block. If 100-120 VAC or 200-240 VAC
exist on the AC input terminal block,
Maintenance Bypass relay is defective,
replace AC EMI filter board.
Inverter will not start. DC input voltage is too high or Measure the DC input voltage using
too low. a multimeter. Check specifications.
Inverter starts and stops. Load VA is too high. Measure load current using Utility
Inverter STATUS indicator AC power.
illuminated RED.
Inverter starts and Inverter Load VA is too high. Measure load current using Utility
STATUS indicator is YELLOW. AC power.
Bypass STATUS indicator is Utility AC voltage or frequency Check utility AC voltage with a multi-meter
YELLOW or RED. Not in specified limits. Check frequency to ensure it
agrees with the DIP switch setting in
the inverter module.
After taking these steps, make a record of the display lights
and messages, call your local MGE Field Engineer or call
1-800-523-0142 for assistance.
4 — 8 Maintenance and Service 86-153061-00
Topaz S3 Inverters 0.5 kVA, 1 kVA, & 2 kVA