Heater problem

　　菲尼克斯端子线圈加热器接线端子处的三根火线对地电压，如果三相火线对地电压都正常，说明主线路及电源正常，加热器有问题。

　　Phoenix terminal coil heater wiring terminal three live wire to ground voltage, if the three-phase live wire to ground voltage is normal, it means that the main line and power supply is normal, there is a problem with the heater.

　　重点检查：加热器是否损坏。

　　Key inspection: whether the heater is damaged.

　　检查方法：测加热器三根发热丝的电阻，正常情况下三根发热丝的阻值都差不多。如果有一根发热丝阻值无限大，说明该发热丝损坏。

　　Inspection method: test the resistance of the three heating wires of the heater. Under normal circumstances, the resistance values of the three heating wires are similar. If there is a heating wire resistance value is infinite, the heating wire is damaged.

　　主线路或接触器的问题

　　Main line or contactor problem

　　测得三相加热器接线端子处三根火线对地电压不正常，则说明是主线路有问题。在接触器吸合的情况下测接触器出线端电压是否正常。如果正常，则是接触器出线端到加热器之间的电缆有问题。否则，就是接触器前端或接触器有问题。

　　The voltage of the three live wires to ground at the wiring terminal of the three-phase heater is abnormal, which indicates that there is a problem in the main line. When the contactor is closed, test whether the outgoing voltage of the contactor is normal. If normal, there is a problem with the cable between the outlet of the contactor and the heater. Otherwise, there is a problem with the contactor front end or contactor.

　　接触器触头的问题

　　Contactor contact problem

　　如果菲尼克斯端子接触器出线端电压不正常，可以再测接触器进线端电压是否正常。如果接触器进线端电压正常，说明是接触器有问题，比如主触头磨损、或主触头不通等。

　　If the outgoing voltage of the Phoenix terminal contactor is abnormal, measure the incoming voltage of the contactor again. If the incoming voltage of the contactor is normal, it indicates that there is something wrong with the contactor, for example, the main contact is worn or blocked.

　　电源到接触器端的问题

　　Power supply to contactor problem

　　如果接触器端电压不正常，说明是接触器前端有问题。再测电源电压是否正常，如果电源电压正常，则是电源到接触器端有问题。

　　If the voltage at the contactor end is abnormal, it indicates that the front end of the contactor is faulty. Then test whether the power supply voltage is normal. If the power supply voltage is normal, there is a problem between the power supply and the contactor.

　　保险线与断路器的问题

　　Safety line and circuit breaker problem

　　如果菲尼克斯端子电源电压不正常，那就检查保险丝、断路器等有无损坏。

　　经验总结：一般保险丝烧坏、发热丝烧坏的可能性较高，其它原因出现概率相对较低，在查找故障原因时，可以优先检查这二个地方，通过排除法逐步找到原因所在。

　　If the phoenix terminal power supply voltage is abnormal, check for damage to fuses, circuit breakers, etc.

　　Summary of experience: Generally, the probability of fuse and hot wire burning is high, while the probability of other causes is relatively low. When finding the cause of the fault, you can check these two places first and find the cause gradually through the elimination method.