MGE UPS Systems EX 7RT - Manual (Page 54)

4.2 Troubleshooting
◗ If any of LED's or is on, there is an operating anomaly or an alarm.
◗ Use "scroll up" or "scroll down" function button to reset the audible alarm.
◗
Troubleshooting not requiring MGE UPS SYSTEMS, INC. after-sales support:
Table 4-2: Troubleshooting not requiring MGE after-sales support.
Symptom Indication Correction
LED is on, and Bypass AC AC source is not connected Rewire correctly the normal AC
source is present to the correct terminals. source.
the alphanumeric display shows
BAD CONNECTION
REWIRE AC NORMAL
LED is on, Load supplied by bypass AC source. Push the ON button for more than 3
the alphanumeric display shows: seconds.
LOAD LEVEL
XX kW / XX KVA
LED is on, and Bypass AC UPS overload Check if any device is shorted or failed.
source is present
the alphanumeric display shows:
THERMAL OVERLOAD
1XX%
LED is on, Short circuit conditions on output Check if any device is shorted or
devices. failed.
the alphanumeric display shows:
CURRENT OVERLOAD
LED is on, 180° degree phase shift between Check if bypass source is correctly
bypass and normal AC source. wired
but the alphanumeric display shows: (in case of upstream transformer use).
BYPASS REVERSE
REWIRE BYPASS
Audible alarm is on,
Input/Output box not Check if the Input/Output box
the alphanumeric display shows: installed correctly. is correctly installed. See section 2.8.
I/O BOX REMOVED
15
18
17
17
17
18 17
EX 5/7/11 RT System
Maintenance 4 — 2 86-86000-00 A01