Service manual

TEST ITEM TEST POINT TEST AND ADJUSTMENT SEQUENCE EXPECTED RESULT
Charger Voltage BAT (+)
BAT (-)
1. Disconnect BAT (+) and BAT (-) wires from pins
respectively.
2. Connect DVM (Set to measure DC) to test points
and plug input power cord to utility.
Adjust VR1 slowly to expected value.
1.Cooling fans on back
panel begin to rotate.
2. 2K/3K 110 Vdc±0.4V
3. 1K 41.2Vdc+0.3V
+DC Bus Voltage @
Line Mode
2K/2K:R104Top (+) and GND
1K: R4 Top (+) and GND
+350VDC±15V
-DC Bus Voltage @
Line Mode
2K/3K:R118 Top (+) and GND
1K: R1 Top (+) and GND
1. Connect DVM (Set to measure DC Volt) to test
point.
2. Plug input power cord to utility.
3. Press ON bottom for 2 seconds to turn the
UPS on.
4. Waiting for 10 seconds to make sure the
Inverter LCD lights.
Check measurement result on DVM
-350VDC±15V
O/P DC Balance @
Line Mode
O/P socket 1. Keeping UPS on @ Line mode.
2. Connect DC measurement fixture to O/P
socket.
3. Check reading on DVM.
100mV max.
+/-DC Bus Voltage @
Backup Mode
2K/2K:R104Top (+) and GND
1K: R4 Top (+) and GND
2K/3K:R118 Top (+) and GND
1K: R1 Top (+) and GND
1. Disconnect I/P power cord from utility and
press OFF bottom for 2 seconds to turn UPS
off.
2. Connect DVM (Set to measure DC) to test
point.
3. Plug input power cord to utility.
4. Press ON bottom for 2 seconds to turn EUT
on.
5. Waiting for 10 seconds to make sure the
Inverter LCD lights.
6. Check reading on DVM
+350VDC±15V
8.
If possible, do a burn-in test on repaired UPS before return it to customer, the longer the better.
If every step is ok, Congratulation, you have finish the maintenance/ repair work
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