Panasonic Urban Multi MX1R Series, Service Manual, Page: 562 / 643

PACD011001C2 Troubleshooting (Inverter)
Troubleshooting UM Combination “MA1R Series” Using R-407C 541
5.7 Outdoor Unit: Inverter Over-Ripple Protection
Remote Controller
Display
P1
Supposed Causes
„
Open phase
„
Voltage imbalance between phases
„
Defect of main circuit capacitor
„
Defect of inverter unit
„
Defect of K1M
„
Improper main circuit wiring
Troubleshooting
(VF069)
Is
the voltage
imbalance applied to the
inverter in excess of 20 V
(3
φ
, 380~415V)?
∗
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 20 V
(3
φ
, 380~415V).
∗
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 MATSUSHITA is not responsible.
Disposal
YES
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.