6.1.49 J31 - High bus voltage fault
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.
When the bus voltage (DC voltage) is greater than the threshold value of the driver (450V)
The input voltage is too high, resulting in high bus voltage.
Instantaneous high input voltage.
The fan drive board is damaged, so the bus voltage detection circuit becomes abnormal.
The IDU main control board is damaged.
J31
Cause 2: If the input power supply is
normal, and the voltage (DC) between
P and N is normal (the normal voltage
is about 310 V), it indicates that the
voltage detection circuit for fan drive
board is abnormal (1)
Cause 1: Measure the input voltage of
IDU. If the voltage is significantly higher
than the normal value (318 V) or the
voltage increases instantaneously, the
power supply is abnormal
Fix the power supply
Replace the fan drive
board (2)
Cause 3: If the error cannot be cleared
after causes 1/2 have been eliminated,
the main control board of the IDU is
damaged
Replace the main
control board of the
IDU
1. Please refer to the figure below when measuring voltage between P and N. Make sure P/N
measuring points are selected according to PCB type.
P/N measuring point
(front of PCB)
P/N measuring point
(back of PCB)
2. 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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