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General| Brand | ABB |
|---|---|
| Model | PST300 |
| Category | Controller |
| Language | English |
Mark all cables prior to disconnection for easy reassembly.
Disconnect main voltage cables from terminals 1L1, 3L2, 5L3.
Disconnect all control, keypad, sensor, and Fieldbus cables.
Ensure tools and personnel are earthed before touching components.
Disconnect thyristor and fan cables from the HV board.
Carefully remove the old HV board, preserving the connector.
Disconnect thermal switch and current transformer cables from LV board.
Remove the old LV board and its display/keypad cables.
Connect display and keypad cables to the new LV board.
Mount the connector, taking care not to damage the pins.
Connect thermal switch and CT cables to the LV board, ensuring correct phase.
