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Display cooler start-up electrical system
author: supermarket refrigerated showcase category: commercial refrigeration Views: 577Time: 2016-08-22
display cooler start-up electrical system
The typical display cooler start-up electrical system circuit differs only in the low temperature compensation circuit and the low temperature compensation method. The following briefly introduces the display cooler start-up electrical system. If the display cooler thermostat knob is placed in the OFF position, the contacts 1, 2, and 3 will be disconnected, and the compressor, compensation heating wire, and lighting circuit will lose power and not work. If the thermostat knob is turned away from the OFF position, the contacts 1, 2, and 3 are closed, the compressor power supply circuit is connected, and the compressor starts to run. At the beginning of the beginning, the display cooler PTC starter resistance value is very low (22Q~33Q range), AC 220V through the PTC starter, compressor start winding formed a large current (about 4A), the corresponding operating current is about 7A ). The large current of
causes the temperature of the PTC starter to rise sharply above the Curie point and enter a high resistance state (equivalent to disconnection). In this way, most of the voltage of the starting circuit is added to the PTC starter, and the PTC device always maintains a high temperature and high resistance state. The compressor's starting work is completed, the current of the starting loop drops to about 30mA, and the current of the operating loop drops to about 1A. Other circuits work the same as the relay start system. Summary of display cooler start-up electrical system: Although common display cooler electrical systems have multiple styles, the door light control circuit is basically the same, and the compressor start method is nothing more than a relay type and a PTC type. There are various forms of low temperature compensation circuits. In addition to the number of heating wires and the difference in power, there are also differences in control methods, such as whether there is a low temperature compensation switch, whether the switch is controlled manually or automatically (sudden thermostat), etc.
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