Rittal 7857.430, Assembly And Operation Instructions Manual

Maintenance Guide  

UPS-Manual 

23

EN 

5.5.2.  Inverter/Internal Over temperature 

If the UPS experiences internal over-tempera-
ture when Utility is normal, it will switch to by-
pass loop. The UPS will switch back to inverter 
mode when the over-temperature situation is 
eliminated. If over temperature occurs when 
Utility is abnormal, the buzzer will beep con-
tinuously and the Fault LED 

 will light up. The 

UPS will cut off supply to the loads.  
 

5.5.3.  Inverter Over-current and Inverter 

Output Voltage out of tolerance 

If the UPS inverter delivers over-current and 
out-of-tolerance voltage to its outlets, the UPS 
is out of order. The UPS will switch to bypass 
loop when Utility is normal. The Utility 

 LED 

and Fault 

 LED will light up.  

If these two fault conditions occur when Utility 
is abnormal, the UPS will cut off the supply to 
its outlets and the Fault 

 LED will light up.  

6. Maintenance Guide 

6.1. Trouble  Shooting 

When the UPS becomes faulty or malfunctions 
during operation, you may check the fault lists 
below for respective solutions. Should the 
problem persists, please contact your local 
dealer for assistance. 

Situation Check 

Items 

Solution 

UPS Fault 

 LED

 
Read the error 
code from the LCD 
display. 
 

 
 
1.Er05, Er25, 
 
 
 
 
 
 
 
 
2. Overload 
 
 
 
 
 
3.Er11 (UPS Over 
Temperature) 
 
 
 
 
4.Site 
wiring/Ground 
fault 

 
 
 
5.Er14 (Fans out 
of order) 
 
 
 
 
6.Other error 
codes 

1. Check battery 

connection if is 
properly done. 
Measure Battery 
voltage to ensure 
batteries are 
charged or healthy. 
Recharge batteries 
for 8 hours if 
necessary. Simulate 
Utility outage to 
verify if UPS is able 
to provide DC back-
up. Otherwise 
consult your local 
dealer right away. 

2. Disconnect some 

non critical loads 
form the UPS output 
until overload 
ceases. Check if 
there is any short 
circuit between 
cables due to broken 
cable insulator. 
Replace the cables 
in necessary. 

3. Remove any objects 

obstructing the 
ventilation louvers. 
Verify if the cooling 
fans are working 
properly. Contacts 
your local dealer to 
replace the fans if 
necessary. 

4. Verify if the “L” & “N” 

phase of the Utility 
AC source has been 
wrongly wired or if 
the Ground-Neutral 
Voltage exceeded 
the limits 

5. Verify if the 

ventilating fans are 
functioning properly. 
Do not attempt to 
replace the fans by 
yourself. Contact 
your local dealer for 
replacement. 

6. Consult your local 

dealer for 
assistance.