Outdoor Unit: Inverter Over-Ripple Protection - Panasonic Urban Multi MX1R Series Service Manual

Using r-407c / r-22
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PACD011001C2
5.7
Outdoor Unit:
P1
Remote Controller
Display
„ Open phase
Supposed Causes
„ Voltage imbalance between phases
„ Defect of main circuit capacitor
„ Defect of inverter unit
„ Defect of K1M
„ Improper main circuit wiring
Troubleshooting
Troubleshooting UM Combination "MA1R Series" Using R-407C
Inverter Over-Ripple Protection
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Imbalance
in supplied voltage is
in excess of 20 V
(3φ, 380~415V).
∗1
NO
Is
the voltage
imbalance applied to the
inverter in excess of 20 V
(3φ, 380~415V)?
∗2
<When voltage monitoring is possible:>
NO
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.
Power supply voltage imbalance
∗In accordance with "notification of inspection results" accompanying spare parts.
Explanation for users
Give the user a copy of "notification of inspection results"and leave it up to
him to improve the imbalance.
YES
Open phase?
NO
YES
∗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.
Disposal
Troubleshooting (Inverter)
YES
Open phase
Normalize field cause.
Fix power supply voltage
imbalance.
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
Be sure to explain to the user that there
is a "power supply imbalance" for
which MATSUSHITA is not responsible.
(VF069)
541

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