Service Manual
44
Installation and Maintenance
20. PL: ODU DC bus bar voltage too low
Malfunction description: When it is detected the voltage of DC bus bar on electrolytic capacitor is less than 200V.
Main check points:
a. Check if the input voltage is too low that out of normal power supply voltage range.
ODU DC bus bar voltage test point is showed as following picture, please measure the voltage of DCLINE-P and DCLINE-N
with multimeter DC grade.
21. Pc: Current detection circuit malfunction/current sensor malfunction
Malfunction description: Check if IU and IV is more than 1.65V*12.5% before powering on the unit.
Main check points: Measure if the IU, IV us abnormal when power off the unit, if the voltage value is not around 1.65V, please
replace the mainboard.
22. P0: IPM module reset
Malfunction description: DSP chip reset and initialize.
Main check points: Check if the wiring distribution in electric box is regular, tidy the wire and test again, if the problem still exist,
please replace the mainboard.
23. Ld: Lack phase
Malfunction description: Compressor current is detected less than a certain value during operation.
Main check points: Check if the CPU mainboard is loosened or incorrect inserted. Well insert and test again, if the problem still
exist, please replace the mainboard/
24. PU: Charging circuit malfunction
Malfunction description: The DC bus bar voltage is less than 100V during charging.
Main check points: Check if the circuit wiring connection is loosened or correct as wiring diagram, well connect the wire, if the
malfunction still exist, please replace the mainboard.
Summary of Contents for AST-24AI
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