Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 263

[ IX Troubleshooting ]
Error Code
5301 ACCT sensor
circuit failure
(Detail code
117)
DCCT sensor
circuit failure
(Detail code
118)
ACCT sensor
failure
(Detail code
115)
DCCT sensor
failure
(Detail code
116)
IPM open/Dis-
connected
ACCT connec-
tor
(Detail code
119)
ACCT faulty wir-
ing detection
(Detail code 120)
Refer to section -8- "Inverter " under part [4] "Trouble shooting principal parts" for error codes related to the inverter.
Error definition and error
detection method
When an error value is (1) Compressor INV board
detected with the ACCT
detection circuit just be-
fore the inverter starts
(2) Grounding fault of com-
When an error value is (1) Contact failure
detected with the DCCT
detection circuit just be-
fore the inverter starts
(2) Compressor INV board
(3) DCCT failure
(4) Grounding fault of the com-
When the effective out- (1) Contact failure
put current between -2
Arms and 2 Arms is de-
tected during inverter op-
(2) ACCT sensor failure
eration
When the bus current (1) Contact failure
less than 18 Apeak is de-
tected at startup
(2) Misorientation
(3) DCCT sensor failure
(4) Compressor INV board
When IPM open damage (1) Disconnected ACCT sen-
or disconnected CNCT2
is not detected just be-
(2) Faulty wiring
fore INV starts (Sufficient
current is not detected
just before startup)
(3) ACCT sensor failure
(4) Disconnected compressor
(5) Compressor INV circuit
ACCT sensor is not se- (1) Wrongly mounted ACCT
curely mounted.
Cause
failure
pressor and IPM failure
failure
pressor and IPM failure
failure
sor
wiring
failure
sensor
- 254 -
Check method and remedy
Refer to 9 [4]-8-(2) [1]
"Check the compressor INV board
error detection circuit"
Refer to 9 [4]-8-(2) [2]
"Check for compressor ground fault
or coil error"
Refer to9 [4]-8-(2) [5]
"Check the inverter circuit trouble"
Check the contact of the connector
(CNCT) on the INV board, and the
contact the connector on DCCT
side.
Refer to 9 [4]-8-(2) [1]
"Check the compressor INV board
error "
When no fault is found with items 1
and 2, replace the DCCT sensor,
and check the polarity of DCCT sen-
sor.
Refer to 9 [4]-8-(2) [2]
"Check for compressor ground fault
or coil error"
Refer to9 [4]-8-(2) [5]
"Check the inverter circuit trouble"
Check the contact of the connector
CNCT2 (ACCT) on the compressor
INV board.
Replace the ACCT sensor.
Check the contact of the connector
CNCT (DCCT) on the compressor
INV board, and the contact around
the connector on DCCT side.
Check the installation direction of DCCT.
Replace the DCCT sensor.
Replace the compressor INV board.
Check the connector CNCT2 connec-
tion.(Check ACCT installation state)
Check CNDR2 connection on the
compressor INV board, or CNDR1
connection on the G/A board.
Refer to9 [4]-8-(4)
"Current sensor ACCT" , and check
the resistance value.
Refer to9 [4]-8-(2) [2]
"Check for compressor ground fault
or coil error"
Refer to9 [4]-8-(2) [5]
"Check the inverter circuit trouble"
Refer to 9 [4]-8-(4)
"Current sensor ACCT"