page 52 / 75 0MNA080A55-GB REV 01
BATTERY DISCHARGE or SWB OPEN
A BATTERY TEST performed by the UPS logic with the mains power supply present detected a battery voltage
lower than the value calculated (see BATTERY TEST menu page 57).
LOW VOLT., PS or OVERLOAD [W]
Alarm present if one of the following conditions occurs:
- the power supply voltage in input is insufficient to power the load (see general characteristics);
- the active power [W] of the output load is greater than the rated value.
OUTPUT OVERLOAD
This indicates that the power absorbed by the load, which is powered by the inverter, is greater than the allowed
rated power, thus the value indicated, expressed as a percentage %VA, exceeds the value of 100%. The same alarm
is also activated when the peak current absorbed by the load exceeds the maximum value allowed.
When this alarm is present, the load must be reduced otherwise the system will automatically transfer onto the by-
pass line within a time that is inversely proportional to the value of the overload.
BY-PASS FOR VA OUTPUT < AUTO_OFF VALUE
This message is present when the power in %VA absorbed by the load is lower than the "AUTO-OFF" value set (see
page 62). The %VA value for AUTO-OFF is factory-set at zero (thus the alarm condition cannot be checked).
INTERNAL FAULT: number
Alarm codes used by the service.
TEMPORARY BY-PASS, WAIT
This indicates that the load is powered from the by-pass line and the system is in the phase prior to the automatic
return to normal operation with power supply from the inverter. This temporary operation may take place, as an
example, during the start-up phase or while waiting for the return onto inverter after a by-pass due to overload.
BY-PASS DUE TO OUTPUT OVERLOAD
This indicates that the load is powered from the by-pass line and is greater than the rated value; the value indicated
on the panel, expressed as a percentage %VA, exceeds the value of 100%.
The load must be reduced so as not to damage the SENTRY MPS-HP.
The load must be reduced in order to return to NORMAL OPERATION. Wait a few minutes to allow cooling (e.g.
the time for the return to NORMAL OPERATION is 60s if the load goes down to 50%, and 8 minutes if it goes
down to 75%).
BY-PASS COMMAND ACTIVE; 8=DISACTIV.
Alarm present when the system has been deactivated and switched onto the by-pass, by means of a specific
command inserted via the keyboard. The command remains stored also during shutdown due to a power supply
failure. The system does not return to normal operation when the power supply is restored if the block has been set
intentionally and not deactivated.
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