Fan Speed Abnormality (Motor Abnormality); Vdc Sensor/Circuit Abnormality - Mitsubishi Electric PUHY-200YMF-C Service Handbook

Checking code Meaning, detecting method
4116 Fan speed (Detects only for PKFY-VAM)
abnormality 1. Detecting fan speed below
(motor 180rpm or over 2000rpm dur-
abnoramlity) ing fan operation at indoor unit
(first detection) enters into the
3-minute restart prevention
mode to stop fan for 30 sec-
onds.
2. When detecting fan speed be-
low 180rpm or over 2000rpm
again at fan returning after 30
seconsd from fan stopping, er-
ror stop (fan also stops) will be
commenced displaying 4116.
4200 VDC 1 If VDC
sensor/circuit before the inverter starts.
abnormality 2 If VDC
before starting of and during
operation of the inverter.
1) Slipping off of fan speed detect-
ing connector (CN33) of indoor
controller board.
2) Slipping off of fan output connec-
tor (FAN1) of indoor power board.
3) Disconnection of fan speed
detecting connector (CN33) of
indoor controller board, or that of
fan output connector (FAN1) of
indoor power board.
4) Filter cologging.
5) Trouble of indoor fan motor.
6) Faulty fan speed detecting circuit
of indoor controller board, or
faulty fan output circuit of indoor
power board.
304 V is detected just 1) Power supply voltage is abnor-
mal.
750 V is detected just
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.
Cause
–127–
Checking method & Countermeasure
• Confirm slipping off of connector
(CN33) on indoor controller
board.
• Confirm slipping off of connector
(FAN1) on indoor power board.
• Check wiring for disconnection.
• Check filter.
• Check indoor fan motor.
• When aboves have no trouble.
1) For trouble after operating fan.
Replace indoor controller board. If
not remedied, replace indoor
power board.
2) For trouble without operating fan.
Replace indoor power board.
• 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).