DC Inverter Air
Annexes
Annex 1 Analysis of Common Faults of Compressors
1. Compressor Fault Detection
(1) Short‐circuit fault of compressor coil: with the multimeter, the resistance between terminal blocks or
between terminal blocks and the ground is measured as 0 ohm under the condition that the compressor is in a
cold state;
Specific fault symptom: power air switch is subject to the leakage of electricity and tripping when the
compressor is started.
Reasons:
a. The air and moisture entered in the cooling system will lead to a poor insulation effect of the coils and it may
cause the short circuit of compressor coil when it is operated in high temperature and pressure for a long time; b.
The system power supply quality is poor, leading to under‐voltage or over‐voltage, phase failure and partial
phase and even the short circuit of compressor coil;
c. The debris entered into the system will block the filter and reduce the circulating amount of the refrigerant,
leading to insufficient running pressure and overheat running of the compressor and even the short circuit of
compressor coil;
(2) open‐circuit fault of compressor coil: With the multimeter, the resistance among terminal blocks is
measured as ∞ ohms under the condition that the compressor is in a cold state.
Specific fault symptom:
a. The compressor is unable to start in case of any open circuit for either group of coils, and the current of other
two groups of coils is big. After a long time, it will lead to the burning of compressor built‐in protector or two
groups of coils.
b. The compressor is unable to start in case of any open circuit of either two groups of coils, and the current of
the residual group of coils is big, and after a long time, it will lead to the burning of compressor built‐in protector
or two groups of coils.
c. The compressor is unable to start in case of any open circuit of three groups of coils, and any group of coils has
no current.
Reasons:
a. The air and moisture entered in the cooling system will lead to a poor insulation effect of the coils and it may
cause the open circuit of compressor coil when it is operated in high temperature and pressure for a long time; b.
The system power supply quality is poor, leading to under‐voltage or over‐voltage, phase failure and partial
phase and even the open circuit of compressor coil;
c. The debris entered into the system will block the filter and reduce the circulating amount of the refrigerant,
leading to insufficient running pressure and overheat running of the compressor and even the open circuit of
compressor coil;
(3) Stuck Fault of Compressor Motor: when the compressor bearing is rotated under the condition of insufficient
lubrication or lack of lubricant, it will cause the abrasion and stuck of compressor bearing.
Specific fault symptom: it will cause the current protection or compressor built‐in protection shortly after the
start of the compressor,
Reasons:
a. The refrigerant leakage and the lubricant leakage occur in the cooling system, which has resulted in the
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