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6: Troubleshooting
36
TS_600_00 PW1000 1-3kVA User Manual 6/4/17
ON BYPASS overload
The UPS bypass line is also equipped with overload protection. Its overload capacity/time characteristics are illustrated in
the table below.
6.5.1 Output load short circuit when the output supply is via inverter
If output load is short circuited while it is being supplied via the inverter:
1. The inverter will immediately shut down and disconnect the supply to the load.
2. The
FAULT led will illuminate and the audible alarm will beep continuously.
3. The UPS will not switch on automatically after the short-circuit condition is eliminated. It has to be re-started manually.
6.5.2 Output short-circuit when the output supply via the bypass line
If the output load is short-circuited while the UPS is operating in ON BYPASS mode:
1. The utility supply fuse/breaker will open to prevent the output load from damage.
2. You must replace the fuse with a fuse of the same rating after the cause of the short-circuit condition has been
rectified.
6.5.3 Inverter/internal over-temperature
If the UPS experiences an internal over-temperature when the utility supply is normal it will switch to ON BYPASS mode
and switch back to ON INVERTER mode when the over-temperature situation has been eliminated.
If over temperature occurs when the utility supply is abnormal:
1. The audible alarm will beep continuously.
2. The
FAULT
led will illuminate.
3. The inverter will shut down and disconnect the load supply.
6.5.4 Inverter over-current and output voltage out of tolerance
If the UPS develops a fault and its inverter delivers an over-current and out-of-tolerance voltage:
1. The UPS will switch to ON BYPASS mode as long as the utility supply is normal.
2. The UTILITY led, BYPASS led and FAULT led will illuminate.
If these fault conditions occur when the utility supply is abnormal:
1. The inverter will shut down and disconnect the load supply.
2. The
FAULT led will illuminate.
6.6 UPS System reset
The UPS control system may ‘lock-up’ following a critical abnormal failure condition. If the UPS appears unresponsive to
control operations you can reset it using the following procedure:
1. Note and record the error code shown on the LCD screen, and check the information in this chapter to help analyse
the cause of the UPS problem. This will be useful if you need to contact the service support centre later.
2. Press an hold the OFF button for at least five seconds.
3. Turn off the utility mains power supply and allow one minute for the UPS control power supply to completely shut
down.
4. The UPS control system is now reset and, if the cause of previous fault condition is no longer apparent, you should be
able to turn on the UPS as normal.
5. If you are unable to restart the UPS then please seek service support.
Load (%) 106-120 121-130 131-135 136-145 146-148 149-157 158-176 177-187 >188
Delay Time (sec) 250 125 50 20 5 2 1 0.32 0.16