Ablerex 3 MS series User Manual page 29

5.6 Main Switch Off, Remove Utility, the Fan is Still Working.
Check Items
Self-Keeping Circuit is out of order
CPU Shutdown function is out of order
NOTE A :
After replace the defective devices, to make sure other parts of UPS is
Normal, please follow the steps below:
1.Cut off the Utility. Remove the control board. Provide 72Vdc to CN10(+) and
CN4(-) by a DC Power Supply, connect CN4 to the main switch then push on the
main switch to see if DC POWER of UPS, i.e. VDD(18-16V), VCC(12V)
and +/-5V is normal. You may check VDD at CN3.1, VCC at CN3.3, +5V at
CN3.5, Ground at CN3.7 or CN10, -5V at CNCN3.9.
2.Turn off the power supply, connect the logic board with driver board and LED
board.
3. Turn on the DC Power Supply, and add the Utility. Push the Main Switch.
Check the LED signals and Inverter output. Remove the Utility. Check
again the LEDs and Inverter voltage.
4.Connect the battery harness. Compose the other of UPS.
NOTE B:
Once the IGBT is defective, the photo coupler(PC923) related normally
need to be replaced, too.
Trouble-shooting
1.Please check the related circuit as shown in
5-2.
2.Cut off the Utility, turn off the front switch
then remove and re-connect the harness of the
battery to see whether the fan still remains
spinning. If so, It means Q13, Q14 or Q16
could be defective.
Cut off the Utility, turn off the front switch then
Remove of the battery, to see if the fan still remains
Spinning. If not, you may re-start up the UPS.
However, you are recommended to replace the
CPU.
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