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CD3000E-3PH from 25A to 500A
User’s Manual
26
9.2
Critical Alarms
When a critical alarm is active, it stops the CD3000E thyristor unit and activates the relative digital
output (terminal 15).
The parameter P001
allows to visualize the state of these alarms (see par. 14.1).
9.2.1
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.
For restart the thyristor unit, check the presence of the line voltage on the power terminals L1, L2, L3
and check the state of the internal fuses, When the problem is solved before to restart is necessary use
the digital input: "Reset Alarm" (see par. 12.5).
9.2.2
External Alarm
This critical alarm is active when the Digital input 4 is configured like “External Alarm" and is activated.
For restart the thyristor unit, you must disarm the external alarm. When the problem is solved before to
restart is necessary use the digital input: "Reset Alarm" (see par. 12.5).
9.2.3
Heat-sink Over temperature
This critical alarm is active when the thermal switch mounted on the heat-sink is activated.
For restart the thyristor unit, you must wait that the heat-sink returns at the safety temperature. When
the problem is solved before to restart is necessary use the digital input: "Reset Alarm"
(see par. 12.5).
If this alarm becomes active, check if the indications described in the “par. 6” of this manual are
respected.
Caution:
this procedure must be performed only by qualified persons.
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