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Check code
Meaning, detecting method
Cause
Checking method & Countermeasure
4200 VDC
sensor/circuit
abnormality
1
If VDC
304 V is detected just
before the inverter starts.
2
If VDC
750 V is detected just
before starting of and during
operation of the inverter.
1) Power supply voltage is abnor-
mal.
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 defective.
7) The INV board is defective.
•
Check if an instantaneous power
failure 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
polarities, 5, for broken wires, and 6,
for grounding in the following wiring.
TB1A~NF~TB1B, TB1B~DS~[52C,
R1, R5]~[C2, C3]~IPM Wiring
CNDC1 (G / A) ~ CNVDC (INV) Wir-
ing
✻
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 52C, 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.”
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 INV
board (when replacing the circuit
board, be sure to connect all the
connectors, ground wires, etc.
securely).
4115 Power supply
sync signal
abnormality
The frequency cannot be deter-
mined when the power is switched
on.
(The power supply’s frequency
cannot be detected. The outdoor
fan cannot be controlled by phase
control.)
1) There is an open phase in the power
supply (L1, L2, L3, N).
2) The power supply voltage is dis-
torted.
3) A fuse is defective.
4) T01 is defective.
5) The circuit board is defective.
Check before the breaker, after the
breaker or at the power supply termi-
nal blocks TB1A, and if there is an open
phase, correct the connections.
If the power supply voltage waveform
is distorted from a sine wave, improve
the power supply environment.
If F1 on the MAIN board, or F3 is
melted, (Resistance between both
ends of the fuse is
∞
), replace the fuses.
To judge failure of the T01, go to “Indi-
vidual Parts Failure Judgment Meth-
ods.”
If none of the items in 1) to 4) is appli-
cable, and if the trouble reappears even
after the power is switched on again,
replace the MAIN board (when replac-
ing the circuit board, be sure to con-
nect all the connectors, ground wires,
etc. securely).
