Remove the front cover (four screws).
2.
3. PSTB unit remove the cables from the
terminal block.
Disconnect the cables the HV-Board from
the thyristors and fans.
6.
Disconnect the cables the LV-Board from
the thermal switch and current transformers.
. Discharge the tools and yourself touching
earth (if you are not earthed).Step step
1.
5. Disconnect all cables from the terminals 1to
20, external keypad, PTC sensor and the
Fieldbus plug.
7.
4. the cables from the thyristors not are
marked, mark them with and 3. Before disconnecting the cables mark them. the cables from the current transformers not
are marked, mark them with and 3
