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Motor reversible operation control circuit

Commissioning of motor reversible operation control circuit

1. Check whether the wiring of the main circuit is correct. In order to ensure that the phase sequence of the motor can be reliably replaced when the two contactors are in operation, the upper port of the contactor should be kept consistent during wiring, and the phase of the contactor should be phased.

2. After checking the wiring is correct, the power-on test, in order to prevent accidents during the power-on test, the motor wiring should be disconnected first.

Pre-processing of fault phenomena;

1. Do not start; one of the reasons is to check whether the control insurance FU is open circuit, whether the thermal relay FR contact is wrong or bad contact, and whether the normally closed contact of the SB1 button is bad. The reason for the second button interlock is incorrect.

2. When the device is activated, the contactor “Do not suck” is not sucked; this is because the interlocking connection of the normally closed contact of the contactor is wrong, the interlocking contact is connected to lock itself, and the closed contact is the contact when starting. The electric coil of the coil is closed, the normally closed contact is disconnected after the contactor is sucked, the contactor coil is discharged again, the normally closed contact is released, the contactor is turned on and the contact is closed again, and the contact is disconnected, so哒” The contactor does not attract.

3, can not be self-locking and lift the hand contactor to disconnect, this is because the self-locking contact wiring is wrong.