EX 5/7/11 RT System

4.2Troubleshooting

If any of LED's 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.

Troubleshooting not requiring MGE UPS SYSTEMS, INC. after-sales support:

Table 4-2: Troubleshooting not requiring MGE after-sales support.

Symptom

Indication

Correction

LED 17 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 17 is on,

Load supplied by bypass AC source.

the alphanumeric display

shows:

LOAD LEVEL

 

XX kW / XX KVA

 

Push the ON button for more than 3 seconds.

LED 17 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 18 is on,

Short circuit conditions on output

 

devices.

the alphanumeric display shows:

CURRENT OVERLOAD

Check if any device is shorted or failed.

LED 15 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

 

 

 

 

 

4 — 2

Maintenance

86-86000-00 A01

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MGE UPS Systems EX 11RT, EX 7RT, EX 5RT user manual Troubleshooting, Symptom Indication Correction

EX 7RT, EX 11RT, EX 5RT specifications

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