7 Commissioning
Maschinenfabrik Reinhausen GmbH 2020 916385142/08 EN ETOS
®
ED
7.2.2 Checking mechanical and electric end stop of on-load tap-
changer/de-energized tap-changer and motor-drive unit
1. Press the S3 control switch to switch the motor-drive unit to the second-
to-last operating position.
Figure73: S3 control switch
2. Open the motor-drive unit door and switch off the motor protective switch
Q1 (position O).
3. Using the hand crank, operate the motor-drive unit to move it to its last op-
erating position. If the last operating position is not reached, check the
coupling between the on-load tap-changer / de-energized tap-changer
and motor-drive unit.
4. Continue turning the motor-drive unit in the same direction with the hand
crank until the motor-drive unit is mechanically blocked.
5. Turn back the motor-drive unit with the hand crank to the mid-position of
the tap-change indicator.
6. Remove the hand crank.
7. Switch on motor protective switch Q1 (position I).
8. Check that the motor-drive unit no longer starts up when the S3 switch is
turned further in the same operating direction as under item 1.
9. Perform the check for both end positions.
7.2.3 Checking tripping of motor protective switch
Proceed as follows to check tripping of the motor protective switch:
ü The motor protective switch Q1 is switched on (position I).
1. Close X1:14 - X1:15 Q1 OFF connection to trip the motor protective
switch.
ð The motor protective switch is tripped (position O). If the motor protec-
tive switch is not tripped, contact Maschinenfabrik Reinhausen GmbH.
2. Switch on motor protective switch again (position I).
ð The tripping of the motor protective switch is checked.
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