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Commercial refrigeration electrical system
The working principle of commercial refrigeration electrical system
Ordinary direct cooling commercial refrigeration electrical system, the compressor start mode has two types: relay start type and PTC start type. The typical circuit of
relay-activated electrical system is more common in old commercial refrigeration. The working process of this kind of circuit has just been plugged in. Because the thermostat and the overload and overheat protector are in the on state, the AC 220V voltage forms a loop through the relay winding, the compressor running winding and the overload protector, generating a large current of 6A~10A. This large current draws the armature of the starting relay (the pull-in current is 2.5A), and the normally open contact of the relay is turned on. The compressor starting winding is energized to generate current, forming a magnetic field, and the rotor rotates. After the motor speed increases, the current in the circuit drops under the action of the back electromotive force. When it drops to not enough to attract the armature (release current is 1.9A), the normally open contact of the relay is disconnected, the start winding stops working, and the current drops to the rated current (About 1A), the motor runs normally. The contact of
overload and overheat protector is normally closed, but when the motor is overcurrent or the temperature of the shrink machine is too high, it will automatically switch to the open state to protect it. Because the overload and overheat protector is connected in series with the compressor, the current will increase when the compressor is overloaded, and the current flowing through the resistance wire in the overload protector will also increase and generate heat. The bimetal will be rapidly deformed due to heat and the contact will be disconnected. , Cut off the compressor power supply, the motor stops rotating. In addition, because the overload protector fastens the compressor casing, when the compressor casing temperature is too high for some reason, the bimetal in the overload protector will deform and reflex, cutting off the compressor power supply circuit. After a few minutes, the bimetal in the overload protector returned to its original position, and the compressor circuit was connected again, and the compressor continued to run. When the overload protector is switched on and off for the second time, it emits a ding sound click , so when a commercial refrigeration compressor fails to operate normally and regularly emits click and sound, it is judged as overload protection.
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