Troubleshooting (Inverter) PACD011001C2
540 Troubleshooting UM Combination “MA1R Series” Using R-407C
5.6 Power Supply Insufficient or Instantaneous Failure
Remote Controller
Display
U2
Supposed Causes
„
Power supply insufficient
„
Instantaneous failure
„
Open phase
„
Defect of inverter unit
„
Defect of outdoor PC board
„
Defect of K1M.
„
Main circuit wiring defect
Troubleshooting
(VF068)
Replace K1M.
NO
Turn on again.
Replace the outdoor unit
PC board.
Check the transmission
wiring between the
outdoor unit PC board
and inverter unit.
Monitor field power
supply.
YES
Turn K1M ON.
YES
NO
Is 220 ~ 240 V of power
reaching the K1M
coil?
Is 220 ~ 240 V at
the connector of X1A.
Replace the inverter unit.
Replace the inverter unit.
YES
NO
NO
Does
the voltage
between terminals P
and N gradually rise to 339
VDC (3φ, 380~415V)
after turning
on?
"U2" blinks again.
The voltage
between the P and N
terminals is 320 VDC (3φ,
380~415V) or more when
the compressor
is running.
YES
NO
Is 220 ~ 240 V
at the connector of X5Aof
outdoor PC board
side?
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
To Next Page
Loading...
