Daikin VRV II REYQ8MY1B, Service Manual

Page: 203 / 309

Troubleshooting by Indication on the Remote Controller Si39-306
192 Troubleshooting
2.39
“
P1
”
Outdoor Unit: Inverter Over-Ripple Protection
Remote
Controller
Display
P1
Applicable
Models REYQ8~48M
Method of
Malfunction
Detection Imbalance in supply voltage is detected in PC board.
Malfunction
Decision
Conditions When the resistance value of thermistor becomes a value equivalent to open or short circuited
status.
„
Malfunction is not decided while the unit operation is continued.
"P1" will be displayed by pressing the inspection button.
Supposed
Causes
„
Open phase
„
Voltage imbalance between phases
„
Defect of main circuit capacitor
„
Defect of inverter PC board
„
Defect of K1M
„
Improper main circuit wiring
Troubleshooting
(V2816)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is
the voltage
imbalance applied to the
inverter in excess of
14 V (Y1)?
∗
2
NO
Part or wiring defect
After turning the power supply
OFF, check and repair the
main circuit wiring or parts.
(1) Loose or disconnected
wiring between power
supply and inverter
(2) K1M contact disposition,
fusion or contact is poor.
(3) Loose or disconnected
noise filter
Using a device capable of
constant recording of power
supply voltage record
power supply voltage
between 3 phases (L1 ~ L2,
L2 ~ L3, L3~L1) for about
one continuous week.
Open phase
Normalize field cause.
Power supply voltage imbalance
Explanation for users
Fix power supply voltage
imbalance.
YES
YES
NO
Imbalance
in supplied voltage is
in excess of 14 V
(Y1).
∗
1
Open phase?
<When voltage monitoring is possible:>
∗
1. Measure voltage at the X1M power supply
terminal block.
∗
2. Measure voltage at terminals L1, L2 and L3 of
the diode module inside the inverter while the
compressor is running.
∗
In accordance with "notification of inspection results" accompanying spare parts.
Give the user a copy of "notification of inspection results"and leave
it up to him to improve the imbalance.
Be sure to explain to the user that
there is a "power supply imbalance"
for which DAIKIN is not responsible.
measure
YES
NO