ecoclima CM2-H16/4DR2, Руководство по обслуживанию

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Four: compressor drive module protection failure
1. Overview of faults
The internal machine displays protection faults of compressor driving module, such as "E4", "F9", "P9" and other faults related to
compressor operation and module driving.
2. Cause
of failure
Compressor phase current is too large, module driving voltage is too low, or IPM module temperature is too high.
3. Possible
failure point
Compressor wiring is reversed, and the driving software parameters of outdoor electronic control components do not match the
compressor;
The power supply is unstable and the voltage changes suddenly;
Poor contact between IPM module and radiator, and failure of thermal conductive silica gel;
Normal protection under high load (abnormal system, such as excessive refrigerant filling, pipeline blockage, dirty blockage of both
devices, etc.);
External controller failure, such as compressor phase current sampling circuit failure, IPM module failure;
Compressor failure, such as short circuit of coil, demagnetization of motor, poor centering of upper and lower flanges, wear of parts,
etc.
4. Fault
handling flow
V: Fault of DC fan of external machine
1. Overview of faults
The indoor unit displays "E2", and the failure of the external DC fan is mainly to ensure the normal operation of the external fan and
prevent the abnormal rotating speed from causing poor heat dissipation effect and overheating of the system.
2. Cause
of failure
The controller detects that the speed of the external DC fan is abnormal, which is caused by poor contact of fan wires, damage of
fan or damage of electronic control components.
3. Possible
failure point
Unstable connection of DC motor;
The coil of DC fan is burnt out;
The fan blade is stuck by foreign matter;
Outdoor controller failure
4. Fault
handling flow
VI. Over-current protection fault
1. Overview of faults
The indoor unit shows overcurrent protection fault, and the compressor stops during protection. Over-current protection mainly
NO
YE
S
Module
failure
Circuit
protection occurs
after a period of
startup
Failure is
displayed within
1 minute after
power-on and
power-on
Is the speed
of external
motor normal
Troubleshooting of non-
rotation of reference external
fan
Outside environment
temperature is too high?
The system has poor
heat dissipation
Check
whether the
system
pressure is
too high
Measure whether
the impedance of
compressor phase
line and casing is
too low
Replace the
electronic control
assembly
Replace the
compressor
NO
NO
YE
S
YE
S
Too much refrigerant?
Capillary blockage, dirty
blockage of both devices,
foreign matter in compressor,
etc.
Is the
compressor
line
connected
correctly
Disconnect the
compressor line, power it
on again, and whether it
still shows fault
Correct
wiring
Replace the
electronic control
board assembly
NO
YE
S
YE
S
NO
YE
S
Malfunct
ion of
DC fan
Whether the
fan terminal
is secure
Re-plug the terminal and
power it on
Is the
fan stuck
Is there short
circuit or open
circuit between
fan lines
Clean up
the
obstacles
on the fan
Is the fan
short-circuited
with the
housing
Replace fan
NO
YE
S
Replace
outdoor
electronic
control
components
NO
NO
YE
S