page 81 / 84
0MLMHTM30RUENUA
10 Appendix A Alarm messages
Below is a list of the alarm messages that are shown on the first line of the display panel, the “A=” column shows the
number that is also displayed on the right in the lower row .
ALARMS
A=
EVENT MESSAGE
DESCRIPTION
0
NORMAL OPERATION
No Alarms are present
1
INTERFERENCES ON
BYPASS LINE
Alarm present when there is interference on the bypass line, such as voltage
peaks or harmonic distortion, while the voltage and frequency are correct.
WARNING: in this case the inverter is OUT OF SYNC with the bypass line;
if the bypass is forced with SWMB, with the remote commands or from the
panel, the load may undergo a sudden variation in voltage.
2
MANUAL BYPASS, SWMB
ON
The mechanical bypass switch SWMB is closed, thus preventing the UPS
from returning to normal operation. The load is powered directly from the
input and will remain unpowered if there is a mains failure.
3
BYPASS LINE VOLT. FAIL
or SWBY,FSCR OFF
The UPS does not recognize the bypass line because it is out of range or
because SWBY is open,
4
MAIN LINE VOLTAGE FAIL
or SWIN OFF
The power supply voltage is not correct, the load is powered with the energy
stored by the battery. This alarm is present if one of the following conditions
occurs:
- the supply voltage or frequency of the rectifier power supply line is out of
range (see characteristics)
- SWIN is open,
- rectifier fault
5
PREALARM, LOW
BATTERY VOLTAGE
Alarm present if the residual backup time is lower than the time set for the
pre-alarm (the factory-set value is 5 minutes).
6
LOW BATTERY CHARGE or
CLOSE SWB
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 51).
7
LOW INPUT VOLTAGE or
OUTPUT 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.
8
OUTPUT OVERLOAD
This indicates that the required load power, which is supplied 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 load current exceeds the maximum value allowed.
When this alarm is present the load must be reduced, otherwise the system
will automatically transfer to the bypass line within a time that is inversely
proportional to the value of the overload.
9
BYPASS FOR OUTPUT VA
< AUTO-OFF VALUE
This message is present when the load power in %VA is lower than the
"AUTO-OFF" value set (see page 56). The %VA value for AUTO-OFF is
factory-set at zero (thus the alarm condition cannot be checked).
10
INTERNAL FAULT :
Alarm codes used by customer service.
11
TEMPORARY BYPASS,
WAIT
This indicates that the load is powered from the bypass line and the system is
in the condition prior to the automatic return to normal operation with power
supplied from the inverter. This temporary operation may take place, as an
example, during the start-up phase or while waiting for the return to inverter
after a bypass due to overload.
12
BYPASS FOR OUTPUT
OVERLOAD
This indicates that the load is powered from the bypass 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 to prevent damage to the UPS.
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%).
