AC contactor selection and operation and maintenance - Schneider Electric
First, the contactor selection:
1 The rated current of the main circuit contact should be greater than or equal to the rated current of the controlled device. The contactor of the control motor should also consider the starting current of the motor. In order to prevent frequent contact of the contactor main contacts, the frequently operated contactor rated current can be reduced.
2 The rated voltage of the electromagnetic coil of the contactor is 36V, 110V, 220V, 380V, etc. The electromagnetic coil is allowed to be used within the range of 80% to 105% of the rated voltage.
Operation and Maintenance:
Check items during operation:
1) Whether the passing load current is within the contactor rating;
2) The split signal of the contactor indicates whether it matches the state of the circuit;
3) Is the running sound normal, and whether there is a discharge sound due to poor contact;
4) Whether the electromagnetic coil is overheated or not, and the short circuit of the electromagnet is abnormal.
5) Whether the arc extinguishing cover is loose or damaged;
6) Whether the auxiliary contacts are burnt or not;
7) Whether the transmission part is damaged or not;
8) Whether there are adverse operating factors in the surrounding operating environment, such as excessive vibration, poor ventilation, and excessive dust.
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