4.4.7 Overload
The demanded power exceeds the normal capacity of the UPS. The alarm occurs when the load is >
100%. If the load exceeds 150% the UPS will immediately switch to bypass, assuming that the conditions
for a transfer to bypass are fulfilled.
If an overload condition between 110-150% persists, the UPS will also switch to bypass operation.
During an overload the UPS may automatically switch off within a few minutes (load dependent) and
output power is lost:
•
if a transfer to bypass is inhibited (see 4.4.6), or
•
if the bypass function has been disabled (see 4.5), or
•
if the UPS operates on battery (see 4.4.4).
To avoid these problems, be absolutely certain that the power demands of the protected equipment
are within the limits of the UPS.
4.4.8 Replace battery
Either the batteries are almost chemically worn out or the battery wiring, including the battery fuse, is
faulty. If the batteries are aged, they must be replaced as soon as possible to ensure full protection for
your equipment (see 7.4). Perhaps the 'replace battery' alarm occurs after a test which you started
immediately after installation or after a power failure. In this case the alarm may be incorrect as the
batteries have been (partly) discharged during transport or storage or during the power failure. Allow
the UPS to recharge the batteries. See also 4.6.
4.4.9 General alarm
‘General alarm’ comprises a group of alarms; the buzzer behaviour indicates which alarm is active:
1 / 2 secs:
General fault
Overload (see 4.4.7)
Overtemperature
Output out of tolerance
1 / 5 secs:
Charger failure
Bypass out of limits (see 4.4.6)
Replace battery (see 4.4.8)
4.4.10 Shutdown pending
The UPS monitoring software allows you to switch the UPS into standby mode after a programmable
delay time. During countdown the ‘operation’ LED will blink 2x per second and the buzzer will beep
every 5 seconds.
4.4.11 Startup pending
The UPS monitoring software allows you to start up UPS after a programmable delay time. During this
delay time the ‘operation’ LED will blink 2x per second.
4.4.12 P-N (Phase-Neutral) reversal indication
If the P-N reversal indication is enabled, the UPS will indicate whether the voltage between Neutral
and Earth (Ground) at the UPS input exceeds a certain voltage (i.e. Phase and Neutral at the UPS input
are reversed in an earthed/grounded Neutral system). In this potentially unsafe situation both LEDs
‘operation’ and ‘alarm’ will blink fast and the buzzer will sound. Reversing the mains plug will prevent
this unsafe situation and will cancel the alarm. In case of non-earthed/grounded Neutral system this
indication should be disabled.
The default setting of the P-N reversal indication is:
enabled
. Changing of the setting is described in
section 4.5.
