SiENBE28-901
Troubleshooting
Air Cooled Refrigeration Condensing Unit
93
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check if the stop
valve is open.
Check if the relay wires
to the compressor are
correct.
Check if the connection
of UVW phase order is
correct.
Check if the wiring is the
same as in the electric wiring
diagram.
The insulation resistance of
the compressor is low (not
more than 100k
Ω
).
The compressor coil
has disconnection of
wires.
Power OFF
Power ON
Restart and check the
operation. Check if the condition
occurs again.
Check if the start mode is in the
high differential pressure (not less
than 0.5 MPa).
YES
NO
YES
NO
YES
NO
YES
NO
Check if the wiring has
any error in mistake for
inverter compressor.
NO
YES
NO
YES
YES
NO
NO
YES
Local factor
Open the stop valve.
Replace the connecting wires and
ensure right connection of the
connector.
Ensure correct connection.
W
U
V
Ensure correct connection.
Replace the compressor.
Conclude the work
There is a possibility of defect of
pressure equalizing.
Check the refrigerant circuit.
Defect of pressure equalizing
Check the refrigerant circuit.
Replace the INV compressor.
∗
1: Pressure difference between high pressure and low pressure before starting.
