33
6.2.1. Troubleshooting
Check Items
Trouble-shooting
Output Short Circuit
Check if the output end of the UPS is in short
circuit.
Overload(>120%)
Reduce the output load to 3000VA/2100W
Battery voltage is abnormal
1. If the battery voltage is under 78V, replace
the batteries
。
2. Remove the battery, and check the charge
voltage. if the voltage is over 115V, the
charger circuit is out of order. Refer to fig6.1,
please check U12
、
U13
、
VR1 and other device
nearby.
INVERTER Voltage ERROR
Refer to fig.6-4, Check U8, U9, Q29, Q30, Q31,
Q32
。
The Fan on the rear panel is out of order
1.Check to see if the connection to the fan is
Properly done.
2.Connect 12Vdc t o the Fan(red line to positive)
to check if the fan is normal.
3.Otherwise, please check the related circuit as
fig 6-2.
Environmental Temperature is out of windows(
Over 40 degree C)
Improve the ventilation and reduce the temperature
of the environment.
BUS Voltage abnormal
The PFC control IC U2 or the Booster control IC
U7 may be abnormal.
The feedback signal to CPU is abnormal.
1.Check if the connection between the control
Board and the driver board is properly done.
2.Check if pin1 of U1(HA17393) of the driver
board is sending out a square wave of Utility
frequency.
6.2.2.Fault Status Analysis
When the Fault LED lights up, you may know which part of the UPS is out of order by
Pushing the Test Switch in front.
Utility
Inverter
Battery Low
Overload Symptom
0
0
0
1
Short Circuit
0
0
1
0
Inverter Over-current
0
0
1
1
Battery Voltage Abnormal
0
1
0
0
Inverter Voltage Abnormal
0
1
0
1
Heatsink Overheat
0
1
1
0
DC Bus Fault
p.s. A code composed by Utility, Inverter, Battery Low and Overload LEDs may indicate the possible
fault conditions by pushing the Test Switch button in front.
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...
