MGE UPS Systems EX-5, EX-7, EX-11RT manual Troubleshooting, Symptoms Indication Correction

Maintenance

4.0Scope

Maintenance includes a troubleshooting guide of symptoms and possible solutions, hot swapping the Power Module and Battery Module, and testing scenarios.

4.1Troubleshooting

◗ If any of LEDs 17 or 18 is on, there is an operating anomaly or an alarm.

◗Use "scroll up" or "scroll down" function button to reset the audible alarm. Table 4-1: Troubleshooting not requiring MGE after-sales support.

Symptoms		Indication	Correction
LED	17 is on, and Bypass AC	AC source is not connected	Rewire correctly to the Normal AC
source is present		to the correct terminals.	source.
the LCD display shows
BAD CONNECTION
REWIRE AC NORMAL
LED	17 is on,	Load supplied by Bypass AC source.	Push the ON button for more than 3
the LCD display shows:			seconds.
LOAD LEVEL
XX kW / XX KVA
LED	17 is on, and Bypass AC	UPS overload	Check if any device is shorted or
source is present			failed.
the LCD display shows:
THERMAL OVERLOAD
1XX%

LED 18 is on, the LCD	Short circuit conditions on output
display shows:	devices.
CURRENT OVERLOAD

Check if any load has shorted or failed.

LED 15 is on,	180° degree phase shift between
but the LCD display shows:	bypass and normal AC source.
BYPASS REVERSE
REWIRE BYPASS

Check if Bypass source is correctly wired

(in case of upstream transformer use).

Audible alarm is on,	Input/Output box not	Check if the Input/Output box
the LCD display shows:	installed correctly.	is correctly installed. See section 2.7.
I/O BOX REMOVED		Check for correct I/O Box.

86-86000-00 B00 Maintenance 4 — 1