6.1.47 J11 - Instantaneous overcurrent protection for phase current
Spot check interface
query
Error code is not
displayed
The faulty IDU stops. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
The current value (AC) detected for any phase line of U/V/W on the IPM exceeds the set
overcurrent protection value of the driver.
Motor coils are short circuited, or motor bearing is worn, resulting in abnormal increase of
motor current.
The fan drive board is damaged.
The IDU main control board is damaged.
J11
Cause 2: The motor bearing is severely worn,
resulting in overcurrent. It causes the motor
to create noise when rotating and to overheat
Cause 1: Measure the inter-turn winding
resistance between the red, white, and black
wires of the motor power cable. If there is a
short circuit or an open circuit, the motor is
damaged
Replace the motor
Replace the motor
Cause 3: The fan drive board is damaged
Replace the fan drive
board (1)
Cause 4: If the error cannot be cleared after
causes 1/2/3 have been eliminated, the
main control board of the IDU is damaged
Replace the main
control board of the
IDU
Note 1: Please observe the following rule when replacing the fan drive board: For units whose fan
drive board is welded onto the main control board, if either the fan drive board or main control
board becomes faulty, the whole control board has to be replaced.
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