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8. Test Step
After replacing all defected components,
following testing steps can be adopted to verify
the repair result and the reliability of the UPS.
1. Install all of boards/cable/connector.
2. Check the wiring, pay more attention to
the charger control cable(3Pin).
3. Apply DC Power from power source with
current limitation function to the battery
terminal.
4. Press the ON button on the panel for
less than 0.5s, the LCD will be lit and
the Fan will rotates, If not, please check
the input voltage of the SPS, if the
voltage is the DC source output voltage,
please repair the SPS again.
5. Press the ON button on the panel for
more than 0.5s until you hear the note
ringing and loosen the button, you will
see "current limit" for a short time on the
DC source for about only 2 seconds,
then UPS should be DC started, If UPS
does not start successfully, please
repair the PFC or CNTL again.
6. If UPS does not start up for several
trying or DC source is on current-limit
state continuously, there must be some
defected components exists. Please
follow trouble-shooting chart to debug
again.
7. Turn off the UPS, connect utility to the
UPS, turn on the UPS, if fail you may
have start one new round of trouble
shooting.
8. Check and adjust charge voltage.
9. Check the output voltage waveform and
DC-offset voltage, at no-load and full
load condition.
Repair the UPS
according to the
trouble shooting
Connect the DC
source and press ON
button less than 0.5s
LCD light and fan
rotates?
DC voltage on the
SPS is OK?
Information of the
LCD display OK?
1. Cable from LCD to
CNTL disconnected.
2. Cable from LCD to
PSDR disconnected.
3. SPS failure
CNTL failure and
repair it
BUS voltage rise to
360V?
Press ON button
more than 0.5s
Booster/CNTL failure
and repair it
INV voltage rise to
230V?
INV/CNTL failure and
repair it
LCD light and fan
rotates?
Shutdown and turn
on the IP breaker
without DC source
and battery
Charger failure and
repair it
BUS voltage rise to
311V?
Rectifier/CNTL
failure and repair it
Press ON button
more than 0.5s
BUS voltage rise to
360V and INV
voltage rise to 230V?
END
Yes
Yes
Check the wiring and
correct it
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
CNTL failure and
repair it
No
No
