Check 1 Check on connector of fan motor (power supply cable)
(1) Turn OFF the power supply.
Check on resistance balance and short-circuiting between phases by measuring each resistance between phases ofU, V, and W with the connector (3-core) at motor side after disconnect the connector or relay connector.
Check 2 Check on connector of fan motor (control cable)
(1) Turn OFF the power supply.
(2) Check on resistance balance between terminals (± 20 % or less) by measuring each resistance between Vcc and U, V, W, and GND and U, V, W with the connector (5-core) at motor side after disconnect the connector or relay connector.
Check 3 Check on pulse input of fan inverter PC board position signal
(1) Disconnect the connector X2A under the conditions of power supply OFF and operation OFF.
(2) Check that approx. 15 V can be read between pin number of 4 and 5 in X2A after turn ON the power supply.
(3) Connect the connector X2A under the conditions of power supply OFF and operation OFF.
(4) Rotate fan motor for one turn manually under the conditions of power supply ON and operation OFF, and check on the following items.
Pulses (approx. 0 V and approx. 5 V) can be output for four times between pin No. 1 and 5 in X2A.
Pulses (approx. 0 V and approx. 5 V) can be output for four times between pin No. 2 and 5 in X2A.
Pulses (approx. 0 V and approx. 5 V) can be output for four times between pin No. 3 and 5 in X2A.
Above item (2) cannot be observed. ? Faulty PC board ? Replace PC board.
Item (4) cannot be observed. ? Faulty hall IC ? Replace the outdoor fan motor.
