E、 Components fault and test methods
1、Ordinary compressor
1）: Ordinary test (power off)
Testing method:
Check the compressor by eyeballing first. If there has burnt vestiges on the surface of compressor or the
compressor gives out the bad smell, the reason mainly is that the winding is burnt. If the compressor terminal
is burnt, mostly it is caused by the heavy current or the bad contact.
2）：Resistance test
①、short circuit: Measure resistance of each winding by universal meter, if the resistance value is lower than
the standard, the winding may short circuit.
②、open circuit: Measure resistance of each winding by universal meter, if the resistance value is infinite, the
compressor winding may open circuit.
3）： Electric leakage & insulation test
Measure resistance between the points of winding and other part of compressor by universal meter, if the
resistance value is infinite, means no electric leakage and the insulation is perfect. If the resistance value is
tiny or zero, electric leakage may exist in compressor or insulation material may be aged or broken.
2、AC motor of indoor and outdoor unit
1）、General inspection
Testing method:
In the case of non-power,twist motor rotor by hand,meanwhile shaking motor. checking is there any
rust,whether blocked.
Fault judgement:
If the motor rotor can’t twist, that means the motor blocked. when shaking motor,there should be no
abnormal noise, if the noise of inside the motor is small,it means motor shaft loose.if the noise of inside the
motor is big,it means there is sundries inside of motor or electrical components loose.
2）、DC resistance
（1）turn-to-turn short circuit:measure entire winding resistance by multimet,if the difference between
measured value with standard value is larger,it means turn-to-turn short circuit.
（2）opencoil: measure entire winding resistance by multimet,if the resistance is ∞,means opencoil.
3）、Electric leakage & insulation test
Measure resistance between the points of winding with other part of motor by universal meter, if the
resistance value is infinite, means no electric leakage and the insulation is perfect. If the resistance value is
tiny or zero, electric leakage may exist in motor or insulation material may be aged or broken.
3、general Electric control panel(PCB)
1）、test method for common electronic component,
To Next Page
Loading...
Need help?
General
