Uninterruptible Power Supplies Online UPS 3K User Manual download pdf (Page 45)

UPS724-01-00 PowerWave 1000 (1-3kVA) User Manual - Dated 26 June 2013 6-3

6: Troubleshooting

6.5 UPS Fault handling

6.5.1 UPS Overload

To prevent severe inverter damage caused by inrush currents, the UPS is equipped with an electronic

overload protection feature which switches the load to the bypass line within 30 sec if the UPS load rises to

between 105% – 120% of its rated capacity. As inrush currents are normally short-lived, once the current

being drawn from the bypass falls below <105%, the UPS will switch back to inverter mode automatically.

Note that if the UPS appears to be repeatedly momentarily overloading it could be due to the inrush currents

produced as various multiple loads are started. If the UPS is overloaded by >150% its inverter will shut down

immediately.

The bypass line is also equipped with overload protection. Its overload capacity/time characteristics are

illustrated in the table below.

6.5.2 Output short circuit

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 is shutdown immediately and stop the supply to the load.

2. The FAULT led will illuminate up 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 (see paragraph 4.1.1).

Output short-circuit when the output supply via the bypass line

If the output load is short-circuited in bypass mode:

1. The utility fuse/breaker will be activated (open-circuited) 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 transfer the load

to the bypass line, and switch back to 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 UPS will cut off 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 transfer the load to the bypass line 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 UPS will cut off the supply to its outlets and shut down.

2. The FAULT led will illuminate.

Load (%) 110-120 121-130 131-135 136-145 146-148 149-157 158-176 177-187 188<

Delay Time

(sec)

250 125 50 20 5 2 1 0.32 0.16

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 51 52

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Uninterruptible Power Supplies Online UPS 3K User Manual Page 45

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