CONNECT SERIES SERVICE MANUAL
39
ENGLISH
Troubleshooting
“PA” AC Current Protection
Error display:
ODU main board LED display
Error judgment condition and method:
If input current value exceeds the set protection value,
then it can be judged that AC current protection occurs
and system will shut down for protection.
Possible causes:
• System is heavy-loaded and compressor current is too
large.
• Grid voltage is abnormal.
• PFC module is damaged.
• Drive board PFC current sampling circuit element
is damaged or drive chip PFC current sampling AD
terminal is abnormal.
“Pc” Driver Current Error
Error display:
ODU main board LED display
Error judgment condition and method:
After power charging, if offset voltage average is
detected to exceed 12.5% of 1.65V in 1s, then it can be
judged that current detection (or current sensor) circuit
is faulted. System will shut down for protection.
Possible causes:
• Current detection (or current sensor) sampling circuit
element is abnormal.
• Drive chip compressor current sampling AD terminal
is badly welded or short-circuited.
Start
PC Current detection (or
current sensor) circuit error
Replace the drive board
No
Yes
Yes
No
Start
PA AC current protection
Grid voltage is normal or not ?
Compressor is running
at high frequency and
high load?
Normal
protection
Normal
protection
Replace the
drive board
“PL” Bus Low-Voltage Protection
Error display:
ODU main board LED display
Error judgment condition and method:
When compressor is running and there is no other
malfunction, if busbar voltage is lower than the set
value for low voltage protection, then it can be judged
that bus low-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.
Yes
No
Start
PL Bus low-voltage protection
Grid voltage is normal or not?
Replace the
drive board.
Normal
protection
