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STE Soft Starter
User’s Manual
35
7.2
Critical Alarms
When a critical alarm is active, it stops the STE Soft Starter, the ALM LED Flashing and the motor
switches to freewheel mode.
There are 2 groups of critical alarm, and the parameter P001
':
, P002
':
allows to visualize the state of these alarms (see par. 9).
7.2.1
Phase loss
This critical alarm is active when one of the three phases R-S-T is loss. The phase loss could be also
activated by an interrupted fuse or if the grid frequency is not between 45 / 65 Hz.
For restart the STE Soft Starter, check the presence of the line voltage on the power terminals L1, L2, L3
and check the connection to the starter and any isolating devices located between the line and the
starter (contactor, fuses, circuit-breaker, etc.)
When the problem is solved before to restart is necessary Reset the Alarm (see par. 6.5).
7.2.2
Phase inversion
This critical alarm is active when Line phase sequence is not correct
For restart the STE Soft Starter, invert two line phases , if the motor rotates in wrong direction swap two
wires on motor side (not with 6 wire connection)
When the problem is solved before to restart is necessary Reset the Alarm (see par. 6.5)
7.2.3
Undervoltage
This critical alarm is active when the Line voltage is under the threshold value set in the parameter
P044
00:'
for a time set in the parameter P045
00:/
(see par. 9)
For restart the STE Soft Starter, check the line voltage on the power terminals L1, L2, L3 or change the
threshold value.
When the problem is solved before to restart is necessary Reset the Alarm (see par. 6.5)
7.2.4
Overvoltage
This critical alarm is active when the Line voltage is over the threshold value set in the parameter
P046
0:$
for a time set in the parameter P047
0:/
(see par. 9)
For restart the STE Soft Starter, check the line voltage on the power terminals L1, L2, L3 or change the
threshold value.
When the problem is solved before to restart is necessary Reset the Alarm (see par. 6.5)
7.2.5
Thyristor Failure
This critical alarm is active when the STE Soft Starter read the output current in absence of the START
command or BYPASS command. This is possible if there are a short circuit on the thyristor or if there are
a wrong wiring of the motor.
When the problem is solved before to restart is necessary Reset the Alarm (see par. 6.5).
7.2.6
Heat-sink Over temperature
This critical alarm is active when the thermal switch mounted on the heat-sink is activated.
For restart the STE Soft Starter, you must wait that the heat-sink returns at the safety temperature.
When the problem is solved before to restart is necessary Reset the Alarm (see par. 6.5)
If this alarm becomes active, check the fan and check if the indications described in the par. 4.3 of this
manual are respected.
Summary of Contents for STE Series
Page 1: ...USER S MANUAL Rev 01 2007 STE Enhanced Soft Starter ...
Page 2: ......
