UPS725-02-02 PowerWave 1000 (4.5 - 10 kVA) User Manual UK Dated 13/03/15
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7: Troubleshooting
7.4
Troubleshooting an operational problem.
7.5
UPS Fault handling
7.5.1 UPS Overload
Items of electronics and IT equipment can generate an inrush current when they switch on.
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 1 minute 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 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.
7.5.2 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:
a) The inverter is shutdown immediately and stop the supply to the load.
b) The
FAULT
led will illuminate up and the audible alarm will beep continuously.
c) 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:
a) The utility fuse/breaker will be activated (open-circuited) to prevent the output load from damage.
b) You must replace the fuse with a fuse of the same rating after the cause of the short-circuit condition has been
rectified.
Symptom
Possible Solution
UPS fails to provide battery back-up, or its back-up time is
shorter than its specified performance.
1. Ensure that the circuit breaker on the back of the battery enclosure
is closed.
2. Charge the battery for eight hours.
3. Recheck, and if the back-up time remains unsatisfactory after 8
hours of charging, please contact your local dealer for battery
replacement.
UPS operation appears to be normal but there is no output to
load.
1. Check that all output power cables are connected correctly, and all
output isolators are closed.
2. If the problem persists, consult your local dealer for technical
assistance.
The UPS switches to battery mode then back to on-line mode,
when the connected device is turned on.
Or, the UPS switches back and forth between battery and on-line
mode.
1. Check for a faulty UPS input cable or utility supply wall receptacle
and replace/repair any faulty item found.
2. If the problem persists, consult your local dealer for technical
assistance.
Strange noise and/or odour emitted by UPS
1. Immediately shut down the UPS System.
2. Disconnect the UPS input power and call for service.
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
