Midea LSBLG255/MZ, Техническое и сервисное руководство

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DX type water-cooled screw chiller (PCB Control) MCAC-CTSM-2014-03
106
2.Troubleshooting
No. Alarm
Trouble
Description
Action Reset Type Possible Cause
1
Power Failure
Protection
Phase
sequence
relay switches
OFF
Compressor cannot work;
The compressor stop
running immediately
Reset manually on the
touch screen
The power quality is
poor, there may exist
phase inversion,
lacking phase or
phase imbalance.
2
Compressor
Motor
Protection Compressor
motor module
switches OFF Compressor cannot work;
The compressor stop
running immediately
Power off the unit and
re-up electricity ,reset
manually on the touch
screen
1.The power of
motor is poor, there
may exist phase
inversion, lacking
phase, over-voltage,
under-voltage
2. The motor overheat
3
Compressor
Overload
Protection
Excess current
and cumulate
energy make
the thermal
relay trip
The compressor stop
running immediately Reset manually on the
touch screen
1,The compressor
continue running in
bad condition,
over-current
2,The setting value of
thermal relay too low
4
Contactor
Protection
The coil of
contactor does
not suction
normally
The compressor stop
running immediately Reset manually on the
touch screen
1.The suction of the
contactor is abnormal
when Y type switch to
△
type
2.The vibration during
operation cause the
contact to loosen
5
Anti-freeze
Protection Anti-freeze
switch OFF The compressor stop
running immediately Reset manually on the
touch screen
1,The chilled water
flow fall sharply, the
water temperature too
low
2,Anti-freeze switch is
damaged or wiring
connection is
abnormal
6
Water Flow
Fault
The water flow
switch
continue
disconnecting
more than 5s
1.Compressor cannot
work; The compressor
stop running
immediately
；
2.Chilled water flow
failure. The chilled water
pump stop working after
30s delay; Cooling water
pump and cooling tower
shut down after 120s
delay
3.Cooling water flow
failure: The cooling water
pump and cooling tower
shut down after 30s
delay; chilled water pump
stop working after 180s
delay.
Power off the unit and
re-up electricity, reset
manually on the touch
screen
1,The water pump
failure, the water flow
too small
2,Water flow switch
failure or wrong wiring
connection
7
High-pressure
Protection High pressure
switch OFF
The compressor which
exists protection stop
running immediately;
Other compressors
continue running
Press red reset
button, reset manually
on the touch screen
1,The cooling water
quality is too bad and
the heat exchange of
condenser is
abnormal
2,There is too much
non-condensable gas
in the system
3,The cooling water
flow too small or the
temperature too high
4,Too much
refrigerant