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Commercial refrigeration starter and protector disassembly, diagnosis and maintenance (2)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 493Time: 2016-08-22
The click sound emitted by the overload protector intermittently. Due to the damage of the starter, the start winding circuit of the commercial refrigeration compressor will fail. It can be connected, without starting current, no rotating magnetic field is formed, and the compressor does not operate; the working current of the same-operating winding circuit is very large (about 10A), the resistance wire in the overload protector is heated to deform the bimetallic strip out of the contact atmosphere, and the compressor is cut off Power is supplied, and after a while, the temperature of the bimetallic strip is restored to the original ON state, and the above process is repeated again. Heavy hammer starter diagnosis. This type of starter is mainly contact ablation, resulting in poor contact. Repeatedly measure the upside and inverted resistance several times. When it is normal, it should be turned off and turned on upside down. If it is not turned off once upright, or not turned on upside down, it is judged that the starter silicon is broken. The launcher is damaged.
[Note] The inverted measurement of the heavy hammer starter should be turned on, and the upright measurement should be turned off. The hammer starter is generally installed on the compressor upright. According to the diagnosis of PTC starter, it burst and failed after damage. PTC starter diagnosis, it is mainly burst and failure after damage. Remove the sound of beating and fragments when shaking by hand, indicating that the PTC component has been opened. The measured value is too large or too small (normal value is 110Q-33Q, generally 22Q-4.4.Q), it means that the starter is damaged. Capacitor starter diagnosis. The damage of capacitor starter is mostly breakdown. After removing the commercial refrigeration capacitor, use the RX100 block of a multimeter to measure the pin resistance. The resistance value is small at the moment of measurement and then gradually rises to near infinity, indicating that it is normal; if the resistance value is close to 0Q, it indicates that the capacitor has broken down. Use a digital meter capacitor block to measure no capacity, indicating that the capacitor has failed.
Initiator is damaged. If the initiator is damaged, replace it with the same specification. Because the starter is a vulnerable part, it is easy to buy and the price is low, so there is no need to repair it. For the poor contact of the heavy hammer starter, some contacts will return to the original position by knocking on the ground a few times. This method can be tried for emergency repair.
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