ABB PST50 Посібник - Сторінка 3

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4. Step by step

1. Before disconnecting the cables mark them.

2. Disconnect the cables from terminals 1L1,

3L2, and 5L3 (main voltage).

3. Disconnect all cables from the terminals 1 to

20, external keypad, PTC sensor and the

Fieldbus plug.

4. Remove the front cover (four screws).

5. Discharge the tools and yourself by touching

earth (if you are not earthed).

6. Disconnect the cables on the HV-Board from

the thyristors and fans. Mark the cables from

the thyristors with L1, L2 and L3.

7. Remove the five screws.

8. Remove the old HV-Board. Don't lose the

connector between HV-Board and LV-

Board.

9. Disconnect the cables on the LV-Board from

the thermal switch and current transformers.

Mark the cables from the current transformers

with CT1, CT2 and CT3.

10. Remove the six screws.

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