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1 HDU 05004-YN Rev. C
8 Commissioning
After connecting all cables, first operate the motor operated mechanism with the emergency crank. It is
not permitted to use a boring machine instead of the emergency crank. If the disconnector or earthing
switch engages properly according to the corresponding operating instructions, the operating
mechanism can be actuated electrically.
Make sure that safety contact (14) is functioning properly, i.e. the circuit must be interrupted when the
emergency hand crank (18) is inserted.
Also check the Auxiliary switch(es) (3) for proper contact make in the two end positions. Adjustments of
the Auxiliary switches are to be made by specialised personnel only.
Check blocking magnet (19) to make sure that its blocking pin is properly located before interlocking
disc when the magnet is de-energised and prevents insertion of the hand crank (18).
If the units are painted, keep the venting hole with filter free from paint.
9 Maintenance
The motor-operated mechanism hardly needs any maintenance.
It is recommended to have an inspection carried out together with the inspection of the corresponding
disconnector or earthing switch after the first 5 years of operation, at the latest, however, after 1,000
make and break operations. The inspection intervals mentioned above apply to normal ambient
conditions. For extraordinary conditions (e.g. use in tropical climate or at excessively low temperatures
or heavy pollution) these intervals should be reduced by 50%.
The following details should be observed during the inspection or random test:
a) Stop electrical supply to disconnector and earthing switch. Care should be taken that heating
circuit and control voltage of the blocking magnet are disconnected.
b) Observe IEC and national safety regulations.
c) Carry out several test operations by hand.
d) Check safety contact (14) (for details see section 8), limit switch (17) and heating resistor (11) for
proper functioning.
e) Check Auxiliary switch(es) (3) for proper contact make in both switching positions. Adjustments
of the Auxiliary switch, if required, should only be made by specialists.
f) Check proper functioning of blocking magnet (19) and interlock switch (51), for details see
section 8.
g) Check whether the control and signalling cable are properly fitted to all terminals.
h) Check whether the movement is properly transmitted from the operating shaft (10) to Auxiliary
switch (3) via control disc (13). If necessary, clean and grease the guides and running surfaces.
i) Check for inadmissible ingress of foreign bodies and moisture.
k) Clean filter insert of cable gland (16) in supply lead plate (9).
I) Check gasket (21) of the door (12a) and replace, if necessary.
m) After inspection, carry out a number of electrical test operations and reconnect the heating
circuit and the blocking magnet to the power supply.
CAUTION :-
- Ensure that Auxiliary switch elements position or orientation is not altered if it is removed for
any maintenance work. This is because it has built-in blow out magnet.
- Ensure blocking magnet (if provided) is in disengaged position.
- Cleaning of any plastic parts must be done with dry cloth only.
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