MGE UPS Systems GES-202L User Manual

17 

 
Please follow the guidelines below for solutions to common problems: 
 

 Check UPS input plug and wiring. 
 Check UPS input voltage. 

 
Please prepare the information as follows for service personnel: 
 

 UPS model number and serial number 
 Description of problem(s) in detail. 

 

General Problems 

 

UPS has no reaction 
while AC power is 
connected 

Fuse/Breaker at back panel open 
No AC input 
UPS fault 
Battery failure 

Replace Fuse/Switch breaker on 
Check AC power  
Call for service  
Call service center to replace batteries

UPS no reaction while 
AC power is connected, 
yet starts after pushing 
power on/off switch 

Breaker at back panel blown  
No AC input  
UPS AC detecting circuit fail 

Switch breaker 
Check AC power  
Call for service 

UPS goes into back-up 
mode while connected to 
AC power 

Utility voltage or frequency 
abnormal  
UPS AC detecting circuit failure 

Check AC power  
Call for service 

Fault LED lit 

Inverter fault.  
Over temperature  
Battery over voltage.  
DC bus fault.  
Overload fault. 

Call for service  
Check load situation 

Battery can not provide 
normal back-up power in 
the event of a blackout 

Battery deteriorated 
Batteries not fully charged 
Battery charger damaged 

Charge batteries and reset 
If that doesn’t work call for service 

After AC connected to 
UPS, alarm sounds short 
and fast beeps and UPS 
shuts down 

Abnormal utility power 

Check input power