Bus Voltage Abnormality; Radiator Panel Overheat Protection - Mitsubishi Electric PUHY-200YMF-C Service Handbook

Checking code Meaning, detecting method
1 If VDC
4220 Bus
voltage tected during inverter
abnormality operation.
4230 Radiator If the cooling fan stays ON
panel for 5 minutes or longer dur-
overheat ing inverter operation, and
protection if THHS
tected.
Cause
400 V is de- 1) The power supply voltage
is abnormal.
2) The wiring is defective.
3) The rush current prevention
resistors (R1, 5) are defective.
4) The electromagnetic contactor
(52C) is defective.
5) The diode stack (DS) is
defective.
6) The reactor (DCL) is defec-
tive.
7) The inverter output is
grounded.
8) The IPM is defective.
9) The circuit board is defec-
tive.
1) The wiring is defective.
100°C is de-
2) The INV boar's fuse (F01)
is defective.
3) The cooling fan (MF1) is
defective.
4) The THHS sensor is defective.
5) The air passage is clogged.
6) The IPM is defective.
7) The circuit board is defec-
tive.
Checking method & Countermeasure
• Check if an instantaneous stop or power failure, etc.
has occurred.
• Check if the voltage is the rated voltage value.
Check 1, the connections, 2, contact at the connectors, 3
tightening torque at screw tightened portions, 4, wiring po-
larities, 5, for broken wires, and 6, for grounding in the fol-
lowing wiring.
TB1A~NF~TB1B, TB1B~DS~[52C, R1, R5]~[C2,
C3]~IPM Wiring
CNDC1 (G / A) ~ CNVDC (INV) Wiring
* Check if the wiring polarities are as shown on the wiring
diagram plate.
To judge failure of R1 and R5, go to "Individual Parts Fail-
ure Judgment Methods."
To judge failure of the 52 C, go to "Individual Parts Failure
Judgment Methods."
To judge failure of the DS, go to "Individual Parts Failure
Judgment Methods."
To judge failure of the DCL, go to "Individual Parts Failure
Judgment Methods."
• Check the wiring between the IPM and the compressor.
• Check the compressor's insulation resistance.
Check the IPM.
Judge that the IPM is fauly, (Go to "Individual Parts Failure
Judgment Methods.")
If none of the items in 1) to 8) is applicable, and if the trouble
reappears even after the power is switched on again,
replace the circuit board by following procedure (when re-
placing the circuit board, be sure to connect all the connec-
tors, ground wires, etc. securety)
1 If the problem is solved after the G/A board only is re-
placed, then the G/A board is defective.
2 If the problem is not solved, reinstall the G/A board and
replace the INV board. If the problem is solved, the INV
board is defective.
3 If the problem is not solved by 1 and 2 above, replace
both boards.
Check 1 connections, 2 contact at the connectors and 3 for
broken wires in the following wiring.
MF1~CNFAN
If the fuse is defective, replace the fuse.
To judge failure of the MF1, go to "Individual Parts Failure
Judgment Methods."
To judge failure of the THHS, go to error code "5110".
If the air passage of the heat sink is clogged, clear the air
passage.
Check the IPM.
Judge that the IPM is fauly, (Go to "Individual Parts Failure
Judgment Methods.")
If none of the items in 1) to 6) is applicable, and if the trouble
reappears even after the power is switched on again,
replace the circuit board by following procedure (when re-
placing the circuit board, be sure to connect all the connec-
tors, ground wires, etc. securety)
1 If the problem is solved after the G/A board only is re-
placed, then the G/A board is defective.
2 If the problem is not solved, reinstall the G/A board and
replace the INV board. If the problem is solved, the INV
board is defective.
3 If the problem is not solved by 1 and 2 above, replace
both boards.
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