Power Supply Insufficient Or Instantaneous Failure - Daikin VRV K Manual

SI-95.BOOK Page 120 Friday, March 31, 2000 10:59 AM
Troubleshooting (Inverter)
4.6

Power Supply Insufficient or Instantaneous Failure

U U U U 2 2 2 2
Remote Controller
Display
I Power supply insufficient
Supposed Causes
I Instantaneous power failure
I Lack of phase
I Defect of inverter unit
I Defect of outdoor PC board
I Defect of K1M.
I Main circuit wiring defect
Troubleshooting
120
Turn on again.
NO
Turn K1M ON.
YES
The voltage
between the P and N
terminals is 320 VDC (Y1)
or more when the
and N gradually rise to 339
compressor
is running.
"U2" blinks again.
Monitor field power supply.
Replace the inverter unit.
YES
Is 220 ~ 240 V of power
reaching the K1M
coil?
NO
Does
the voltage
between terminals P YES
VDC (Y1) after
turning on?
NO
NO
Is 220 ~ 240 V at
the connector of X1A.
YES
Is 220 ~ 240 V of outdoor
PC board side?
YES
Replace the outdoor unit PC board.
Check
the transmission
wiring between the outdoor
unit PC board and
inverter unit.
Troubleshooting Inverter K Series
Si-95
Replace K1M.
Replace the inverter unit.
NO
(VF068)