10 Fault elimination
Maschinenfabrik Reinhausen GmbH 2020 3516385142/08 EN ETOS
®
ED
If you notice a fault in the motor-drive unit right away, you should immedi-
ately start troubleshooting as described in the following table.
Error pattern Action
Tripping of the motor protective switch
Q1
▪ Hand crank operation is prohibited
▪ Switch on Q1 only once
▪ If Q1 does not trigger again and if no
other fault is present, the motor-drive
unit automatically ends the switching
operation that was started.
▪ If Q1 is tripped again, do not attempt
any more switching operations and
contact MR.
Interruption of the supply voltage to the
motor-drive unit or motor controller
▪ Hand crank operation is prohibited
▪ Reestablish the voltage supply
▪ Once the voltage supply returns, the
motor-drive unit automatically ends
the switching operation that was
started.
Component defect in the motor-drive unit ▪ Hand crank operation is prohibited
▪ Contact MR
Table127: Fault in the motor-drive unit when the switching operation has not been ended
10.5 Fault in the motor-drive unit after the switching operation is
ended correctly
Error pattern Action
Tripping of the motor protective switch
Q1
▪ Switch on Q1
Interruption of the supply voltage to the
motor-drive unit or motor controller
▪ Reestablish the voltage supply
Component defect in the motor-drive unit ▪ Contact MR
Table128: Fault in the motor-drive unit after the switching operation is ended correctly
10.6 Hand crank operation in the event of faults
Hand crank operation in the event of faults
An operation is considered an emergency operation if a tap-change opera-
tion is absolutely necessary when a transformer is energized, despite a fault
in the motor-drive unit.
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