Carrier X-POWER Series - Page 151

Carrier service manual R410A DC Inverter Series
Troubleshooting 169
4.4 E5: Voltage error (Display on faulty unit, others in standby)
Note:
1. How to check whether the compressor is short circuit
①
:
The normal resistance value of inverter compressor among U V W is E655 0.164Ω/ E405 0.23Ω, and infinity to earth. If the
resistance value is out of the range, the compressor is abnormal.
2. How to check whether the fan motor is short circuit
②
:
The normal value of DC fan motor coil among U V W is less than 10Ω, and the value of AC fan motor coil is from a few ohm to
hundreds of ohm for different fan motor model. If the measured value is 0Ω, the fan motor is short circuit.
3. How to check whether the inverter module is output error
③
:
Dial the multimeter to diode position, black pen on P and red pen respectively on U,V,W, if the multimeter displays 0.3~0.7 V, it
is normal; Red pen on N, black pen respectively on U,V,W, if the multimeter displays 0.3~0.7 V, it is normal.
Satisfying the above two conditions at the same time indicates that the inverter module has no problem.
E
5
:
Voltage error
Voltage of power supply is too high or
too low (the normal voltage between
L1 and L2 (L1 and L3, L2 and L3)
should be
16
5
V~
255
V
)
Provide normal power supply
Check the high voltage circuit.
Whether the compressor is short
circuit
①
, fan motor is short circuit
②
,
inverter module is output error
③
, etc.
Replace the inverter module
or repair related parts
Outdoor main control board is
damaged
No
No
Yes
Yes
Replace the outdoor main control board