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Mark the cables from the current transformers
with CT1, CT2 and CT3.
5.
7. Disconnect all cables from the terminals 1to
20, external keypad, PTC sensor and the
Fieldbus plug.
2. Remove the old HV-Board.
4.Step step
1.
9. Disconnect the cables the HV-Board from
the thyristors and fans. Disconnect the cables the LV-Board from
the thermal switch and current transformers. Remove the six screws. Remove the front cover (four screws). Before disconnecting the cables mark them. Discharge the tools and yourselfby touching
earth (if you are not earthed).
8. Don’t lose the
connector between HV-Board and LV-
Board.
10. Disconnect the cables from terminals 1L1,
3L2, and 5L3 (main voltage).
-. Remove the five screws.
3. Mark the cables from
the thyristors with L1, and L3.
6
