Causes and solutions for phase failure of industrial refrigerators

Causes and solutions for phase failure of industrial refrigerators

Industrial refrigerators display reverse phase loss failure, which is a common failure of abnormal power supply. The reason for this failure is simple, and it is very convenient to repair, as long as a person with a little electrician basis can solve it easily!

The power supply of industrial refrigerators is powered by a three-phase four-wire system. There are directional restrictions in the operation of some electrical accessories of the equipment. Besides, the motor is not allowed to run without phase, which will cause mechanical failure or burn the motor coil, so cold water Machine manufacturers have installed power protection devices (phase sequence and phase failure protection relays)

. 　　 The failure of "reverse phase loss" is nothing more than the following conditions:

　　 1. The power protector is broken:

When the industrial refrigerator is normally powered, close the air switch in the control box. At this time, the indicator light on the power protector will light up (red means power is supplied, yellow means power is normal), if only the red light is on, It means that the three-phase power supply is missing one item or the sequence of the three-phase power supply is incorrect. If it is confirmed that the power supply is normal, but the indicator light of the power protector is off, it means that the protector is damaged.

　　The power protector is located in the control box, open the control box panel, you can quickly understand who is the power protector.

　　 Treatment method: judge whether there is phase loss or reverse phase according to the indicator light on the protector. Use a multimeter to find the cause of one phase missing from the three-phase power supply and eliminate it, or change the order of the three-phase power supply (change the order of the two at will). Or replace the power protector.

　　 Two, power supply lack of phase or phase sequence reversed:

　　 This problem can be basically judged by our power protector. When the power protector only has a red light on, it can basically be regarded as a lack of phase or a reverse phase sequence.

　　 Treatment method: Check the three-phase power supply with a multimeter to find out the cause of the lack of phase. Or change the order of any two of the three-phase power supply.