The occurrence rate of the constant temperature and humidity test chamber failure is related to the quality and operation, and the circuit design is also the same, so the price is low. Inappropriate quality selection will bring more failures in the later stage, which will also generate more maintenance costs. When it is more expensive than when purchasing equipment, in this chapter, Shanghai Linpin Instrument Co., Ltd. Co., Ltd. tells the users about the troubleshooting of the equipment motor!
[Constant temperature and humidity test box motor short circuit fault description]
1) Short circuit between motor running windings → When this problem occurs, the motor can start the running program reluctantly, but its sound will be significantly larger than normal, and the running current is more than 1 time than the normal value. Measuring the resistance of the running winding, it can be measured that it is smaller than the normal value.
2) Short circuit between motor start windings → When this problem occurs, the motor can start normal operation manually, but the problem is that it cannot be started after starting the relay.
3) The motor starting winding is short-circuited with the running winding. When this problem occurs, the multimeter can be used for inspection. The resistance of the starting and running windings is significantly reduced compared with the normal value. In the state where the control circuit such as the power supply voltage and the starting relay are normal, the starting relay has a continuous overload phenomenon, and the thermal protection contact trips. For the solution of these problems, it is normal to directly change one compressor.
[Specifications of other faults in constant temperature and humidity test chamber motor]
1) Motor winding wiring or lead disconnection → The motor leads and the three terminals in the compressor casing fall off, which may cause the motor to open. For the maintenance of this situation, the compressor should not work after the constant temperature and humidity test chamber is turned on after the power supply voltage is normal. The starter winding and the running winding can be measured with a multimeter. The resistance is infinite, which can be proved. There is a break in the motor.
2) The common terminal of the motor terminal is in contact with the casing. When the fault occurs, the motor can be started and operated, but the grounding of the constant temperature and humidity chamber is good.
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