J11 Instantaneous Overcurrent Protection For Phase Current - Midea V8 VRF Series Service Manual

6.1.47 J11 - Instantaneous overcurrent protection for phase current
Error display
The faulty IDU stops. Other IDUs of the same system: operate normally.
Error impact
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
Error trigger
overcurrent protection value of the driver.
Error recovery Automatic recovery
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Possible cause
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Troubleshooting
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.
Digital display
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.
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
Cause 2: The motor bearing is severely worn,
resulting in overcurrent. It causes the motor
to create noise when rotating and to overheat
J11
Cause 3: The fan drive board is damaged
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
Display position
Panel or display box
Spot check interface
query
damaged
V8 VRF Indoor Units
Wired controller
Error code is not
displayed
Replace the motor
Replace the motor
Replace the fan drive
board (1)
Replace the main
control board of the
IDU
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