Power Supply Insufficient Or Instantaneous Failure - Panasonic Urban Multi MX1R Series Service Manual

Troubleshooting (Inverter)
5.6

Power Supply Insufficient or Instantaneous Failure

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