Maintenance In Busbar Compartment - ABB UniGear ZS1 Instruction Manual

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Figure 134:

View of the busbar compartment, shown without insulating covers

Branch conductor

Busbars

Tulip isolating contact

Bulkhead, removable

• Clean the surfaces:

- Remove any dry dust deposits which are not very adherent using a soft dry cloth;

- Remove any more adhering dirt with a low alkaline detergent or with ETHANOL F 25 M;

• Clean the insulating surfaces and the conductive components with ETHANOL F 25 M;

• After cleaning, rinse with clean water and dry carefully;

• Should any partial discharges occur as a consequence of the condensation phenomenon, a

temporary remedy which is often effective is application of a thin layer of silicone over the surface

involved. For a permanent remedy to this type of unusual problem, contact the ABB after-sales

assistance department.

7.3.1 Maintenance in busbar compartment

7.3.1.1 Checking of the tightening main busbars

• Make the plant you want to work on safe (follow the plant safety regulations).

• Remove the circuit-breaker from the panel where you want to work and close the earthing switch.

• Close the earthing switch relative to the main busbars.

• By accessing through the circuit-breaker compartment, remove the bulkhead 9 (Figure 2) unscrew-

ing no.7 screws M8.

• After the removal of the bulkhead from the circuit-breaker compartment, the main busbars are

visible.

• Using a dynamometric spanner, check tightness of all the screws. Refer to the table on page 40 for

the tightening values;

7.3.1.2 Visual inspection of the insulating materials

• Make the plant you want to work on safe (follow the plant safety regulations);

• Remove the circuit-breaker from panel where you want to work and close the earthing switch;

• Close the earthing switch relative to the main busbars;

• By gaining access from the circuit-breaker compartment, remove bulkhead 9, unscrewing no.7 M8

screws;

• After removal of the bulkhead from the circuit-breaker compartment, the main busbars are visible;

• Visually check that the top monoblocs 5, where the tulip isolating contact is housed, are integral and

do not show any breakages;

• Visually check that the insulating covering of the main busbars and the insulating joining cover of

the busbars are integral and do not show any breakages;

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