35
6.4 UPS Fails to Backup When Blackout
FIG. 6.4
Check Items
Trouble-shooting
Battery is weak and no battery
charging current
When it is in charging mode.
Remove the harness of the battery from the
control board to measure the battery voltage. If
the voltage drops dramatically, please use a
switching power supply to charge the battery.
The charging voltage can be set at 115.2Vdc.
The battery shall be charged up to 80% of its
capacity.
Battery is defective
Replace the battery with same size.
Battery harness is loose in
connection.
The current provided by the battery is approx. 20-30A when it is at full
load. Please proceed to check any loose connection.
The IC of DC Booster stage is
out of order.
1.Check the related circuit is normal as shown in
fig. 6-5.
2.Check if the U7(IC SG3525) is normal. Cut the Utility Source , remove
the battery and remove the control board, add a 96Vdc to CN5(+) and
CN6(-) and 18Vdc to the pin 15 of U7 and short JP2 and check if the
pin 16 of U7 is 5.1V and pulses can be found at Pin 11 and Pin 14 of
U7. If not, please replace U7.
2. The MosFETs (Q12, Q13, Q14, Q24, Q27, Q28) and
Diode(D32-D35) maybe abnormal, please check them.
DC to DC converter is
abnormal and/or the battery
fuse is defective.
1.Check the related circuit shown in fig. 6-5.
2.Check if (Q12, Q13, Q14, Q24, Q27, Q28)
and Diode(D32-D35) of the driver board are
defective.
Summary of Contents for 3 MS series
Page 7: ...7 1 2 3 4 5 6 7 8 9 Pin 6 RS232 Rx Pin 9 RS232 Tx Pin 7 Ground...
Page 24: ...24 5 2 Fault LED Lights up and No Output FIG 5 2...
Page 32: ...32 6 2 Fault LED Lights up and No Output FIG 6 2...
Page 39: ...39 Appendix a 1 Wiring Diagram a 1 1 For MS 1K...
Page 41: ...41 a 1 3 For MS3K...
Page 42: ...42 a 2 Placements a 2 1 For MS1K 220V...
Page 43: ...43 a 2 2 For MS2K 220V a 2 3 For MS3K...
Page 44: ...44 a 2 3 For MS3K 220V...
Page 45: ...45 a 2 4 For MS1K 120V...
Page 46: ...46 a 2 5 For MS2K 120V...
