MGE UPS Systems 3000 RT 3U User Manual

34007776EN/AB

 - Page 18

5. Maintenance

5.1 Troubleshooting

  

  

If LED (21) or (22) is ON, a fault or an alarm has occurred.
Use the escape button (24) to stop the audio alarm.

The UPS does not start,
the alphanumeric display indicates:
COLD START NOK
CHECK AC WIRING

The AC input power is not 
connected or is connected to the 
UPS output.

Check the UPS is correctly 
connected to the AC input power.

LED (22) is ON, the SWF LED (11) at 
the rear of the UPS is ON.
The alphanumeric display indicates:
SITE WIR. FAULT
CHECK AC WIRING

Phase inversion on AC input power. 
The UPS does not start.

◗

 In an earthed-neutral system, to 

correct the wiring, disconnect and 
turn the AC-power outlet 180° (DIN-
SCHUKO type) or call an electrician 
to modify the connections.

◗

 For all other types of system, 

disable the detection function.

LED (22) is ON,
the alphanumeric display indicates:
NO BATTERY
CHECK CONNECTION

The battery is incorrectly 
connected.

Check battery connections (see 
section 5.2, Battery-module 
replacement).

LED (22) is ON,
the alphanumeric display indicates:
BATTERY FAULT
SERV REQUIRED

A fault is detected on the battery.

Replace the battery (see section 5.2, 
Battery-module replacement).
Call the after-sales support 
department.

LED (21) is ON,
the alphanumeric display indicates:
OVERLOAD ALARM
REDUCE LOAD

The load level exceeds the 
programmed overload level or UPS 
capacity.

Check the power drawn by the 
connected devices and disconnect 
any non-priority devices. Check the 
programmed overload level.

LED (22) is ON,
the alphanumeric display indicates:
LOAD UNPROTECTED
OUTPUT OVERLOAD

The UPS is overloaded. Devices 
connected to the UPS are fed 
directly by the electrical network via 
the By-pass.

Check the power drawn by the 
connected devices and disconnect 
any non-priority devices.

LED (22) is ON,
the alphanumeric display indicates:
REDUCE LOAD
RESTART UPS

After repetitive overloads, the UPS 
is locked in the By-pass position. 
Devices connected to the UPS are 
fed directly by the electrical 
network.

Check the power drawn by the 
connected devices and disconnect 
any non-priority devices.
Shut down and restart the UPS to 
return to normal operation.

LED (22) is ON,
the alphanumeric display indicates:
OVERLOAD FAULT
REDUCE LOAD

The UPS shut down automatically 
because of overload at the UPS 
output.

Check the power drawn by the 
connected devices and disconnect 
any non-priority devices.

LED (22) is ON,
the alphanumeric display indicates:
LOAD SHORT-CIRCU
CHECK WIRING

The UPS shut down automatically 
because of a short-circuit at the 
UPS output.

Check the installation at the UPS 
output (wiring, fault equipment).

LED (22) is ON,
the alphanumeric display indicates:
INTERNAL FAULT
SERV REQUIRED

A UPS internal fault has occurred. 
There are two possible situations:

◗

  the load is still supplied, but 

directly with AC power via the 
bypass,

◗

  the load is no longer supplied.

Call the after-sales support 
department.

The alphanumeric display indicates:
REMOTE POWER OFF
RPO

Switching of the Remote Power Off 
(RPO) has led to the shut down of 
the UPS.

Replace the contact in the normal 
position, and press the ON/OFF 
button to restart.