CONNECT SERIES SERVICE MANUAL
34
ENGLISH
Troubleshooting
“PH” Bus High-Voltage Protection
Error display:
ODU main board LED display
Error judgment condition and method:
If there is no other malfunction and the busbar voltage
is higher than the set value for high voltage protection,
then it can be judged that bus high-voltage protection
occurs. System will shut down for protection.
Possible causes:
• Voltage of power grid is abnormal.
• Drive board busbar voltage sampling circuit element
is damaged or drive board busbar voltage sampling
AD terminal is abnormal.
“PU” Charge Loop Error
Error display:
ODU main board LED display
Error judgment condition and method:
When the charge loop begins to charge and the busbar
voltage cannot reach the set value in a certain period
of time, it can be judged that charge loop error exists.
System will shut down for protection.
Possible causes:
• Voltage of power grid is abnormal. Voltage is too low.
• Drive board charge loop element is abnormal.
• Drive board busbar voltage sampling circuit element
is damaged or drive chip busbar voltage sampling AD
terminal is abnormal.
“ee” Drive Memory Chip Error
Error display:
ODU main board LED display
Error judgment condition and method:
If power is connected but the drive board and the
memory chip cannot detect the memory chip or read
the memory chip data correctly, then it can be judged
that drive memory chip error exists.
Possible causes:
• The drive board that needs memory chip is not
installed with the memory chip.
• The lead or connector of memory chip is badly
welded or short-circuited.
Start
Start
Start
PH Bus low-voltage protection
PU Charge loop error
ee Drive memory chip error
Grid voltage is normal or not?
Grid voltage is too low?
Drive board is installed with
memory chip or not?
Replace the
drive board.
Replace the
drive board.
Install the
memory chip.
Normal
protection
Normal
protection
Replace
the drive
board.
Yes
Yes
Yes
No
No
No
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