Ablerex 3 MS series User Manual page 37

Check Items
Power Devices defective, AC or DC fuse is burn
The working voltage of the control board is out
of order.
CPU is down.
6.6 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:
3.Cut off the Utility. Remove the control board. Provide 96Vdc to CN5(+) and
CN6(-) 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
Please see table 5.3 and 5.4 .
1.Please check the circuit shown in fig.6-2.
2.Cut off the Utility. Remove the control board.
Supply a 96Vdc to CN5(+) and CN6(-) by a DC
Power supply, connect CN4 to the main switch.
Push on the main switch and to see if DC
POWER, i.e. VDD(17.5V), VCC(12V) and +/-
5V is normal.
3.Check if Q15, Q16, Q17, Q19, D17, D18 and U6
Is normal.
4. Check if any abnormal output signal of the U7.
If the DC POWER is normal, the CPU could be
Down. Remove the battery harness from the
UPS and re-connect it back to its position.
Trouble-shooting
1.Please check the related circuit as shown in
6-2.
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 Q15, Q16 or Q17
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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