Mitsubishi Electric CITY MULTI CMB-P1010V-E, Руководство по обслуживанию, Страница: 121 / 154

–118–
Checking code Meaning, detecting method Cause Checking method & Countermeasure
4210
4220
Breaking of
overcurrent
Bus voltage
abnormality
1. If IDC 103 A peak is detected
during inverter operation.
2. If the voltage of the INV board’s
sensor circuit input is what it
should not normally be.
1. If VDC 400 V is detected dur-
ing inverter operation.
2. If VDC 800 V is detected dur-
ing inverter operation.
1) The power supply voltage is abnor-
mal.
2) The wiring is defective.
3) The inverter/compressor is defec-
tive.
1) The power supply voltage is abnor-
mal.
2) The wiring is defective.
3) The rush current prevention resis-
tors (R1, 5) are defective.
4) The electromagnetic contactor
(52C) is defective.
5) The diode stack (DS) is defective.
6) The reactor (DCL) is defective.
7) The inverter output is grounded.
8) The circuit board is defective.
• Check if an instantaneous power
failure or power failure, etc. has oc-
curred.
• Check if the voltage is the rated volt-
age value.
Check 1, the connections, 2, contact
at the connectors, 3 tightening torque
at screw tightened portions, 4, wiring
polarities, 5, for broken wires, and 6,
for grounding in the following wiring.
TB1A~DS~[52C, R1, R5]~[C2,
C3]~TRM Wiring
TRM~CNVDC Wiring
TRM~Compressor Wiring
[CN2-1, CN2-2, CN2-3, CN3]~TRM
Wiring
* Check if the wiring polarities are as
shown on the wiring diagram plate.
* Check the coil resistances and in-
sulation resistance of the compres-
sor.
Go to “Treatment of Inverter/Compres-
sor Related Trouble.”
• Check if an instantaneous stop or
power failure, etc. has occurred.
• Check if the voltage is the rated volt-
age value.
Check 1, the connections, 2, contact
at the connectors, 3 tightening torque
at screw tightened portions, 4, wiring
polarities, 5, for broken wires, and 6,
for grounding in the following wiring.
TB1A~DS~[52C, R1, R5]~[C2,
C3]~TRM Wiring
TRM~CNVDC 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 Failure Judgment
Methods.”
To judge failure of the 52 C, go to “In-
dividual Parts Failure Judgment Meth-
ods.”
To judge failure of the DS, go to “Indi-
vidual Parts Failure Judgment Meth-
ods.”
To judge failure of the DCL, go to “In-
dividual Parts Failure Judgment Meth-
ods.”
• Check the wiring between the TRM
and the compressor.
• Check the compressor’s insulation
resistance.
If none of the items in 1) to 7) is appli-
cable, and if the trouble reappears even
after the power is switched on again,
replace the INV board (when replacing
the circuit board, be sure to connect all
the connectors, ground wires, etc. se-
curely).