Checking Cables, Blower Fan Does Not Start

Checking Cables, Blower Fan Does Not Start









Check MCC control module, fan resistor and blower fan connector for contact resistance and oxidation according to Checking wiring and terminals - Permanent faults. Check that connectors are connected correctly Checking Wiring and Terminals

Check that the blower fan is not blocked or turning slowly. Check power supply between MCC control module #A1, #A2, #A3, #A5 and fan resistor terminals 2, 6, 4, 1 for an open-circuit according to Checking wiring and terminals - Permanent faults and a short-circuit to ground according to Checking wiring and terminals - Permanent faults Checking Wiring and Terminals

Check the power supply between MCC control module #A6 and blower fan for an open-circuit according to Checking wiring and terminals - Permanent faults and for a short-circuit to ground according to Checking wiring and terminals - Permanent faults Checking Wiring and Terminals

Check power supply to MCC control module #A4 for an open-circuit according to Checking wiring and terminals - Permanent faults.
Check ground lead between blower fan and ground terminal for an open-circuit according to Checking wiring and terminals - Permanent faults Checking Wiring and Terminals

If the cables are OK, try a new blower fan resistor or a new blower fan.

Remedy as necessary.

Other information:

- To connect the breakout box Connection of Breakout Box MCC
- For information on signals refer to Signal Specifications MCC Signal Specification MCC

After performing this procedure, Verification