J1E Ipm (Fan Module) Overcurrent Protection - Midea V8 VRF Series Service Manual

V8 VRF Indoor Units
6.1.46 J1E - IPM (fan module) overcurrent protection
Error display
The faulty IDU stops. Other IDUs of the same system: operate normally.
Error impact
ODU of the same system: operate normally.
The fault is triggered if one of the following conditions is met:
1) 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 IPM.
2) A fault signal output by the IPM protection circuit is detected.
Error recovery
Automatic recovery


Possible cause

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.
94
Digital display
The motor insulation is damaged or motor coils are short circuited.
The fan drive board is damaged.
The IDU main control board is damaged.
J1E
Panel or display box
Spot check interface
query
Cause 1: Measure th e i nte r-turn win ding
resistan ce be tween the red, white, and
black wires of the mo tor po wer cable. If
there is a short circuit or an op en circuit,
the mo tor is d amaged
Cause 2: Measure th e r esi stance betwe en
any wir e p in o f th e p owe r cord plu g o f th e
motor a nd the metal housing of the moto r.
If th e re sistance i s less than 1 MΩ, the
motor i s damage d
Cause 3: The fan dr ive boa rd is damage d
Cause 4: If th e e rror ca nnot be cleare d
afte r causes 1/2/3 have been eli min ate d,
the ma in control boa rd o f th e IDU is
damag ed
Display position
Wired controller
Error code is not
displayed
Replace th e motor
Replace th e motor
Replace th e fan drive
boa rd (1)
Replace th e main control
boa rd o f th e IDU