1. Preparation work before the installation of the brake motor. Motors that have been newly installed or idle for more than three months shall be checked for their functions, electrical functions and machine functions before application to ensure reliable operation of the motors.

1. Check the insulation resistance of the brake motor windings. Open the junction box. Use a megohmmeter above 500V to measure the insulation resistance between the winding and the base. The usual resistance should be >5M ohms. Remove the continuous piece of the connection terminal and measure the insulation between the winding phases. The usual resistance should be >10M ohms. If in the above measurement process, the resistance value is too low once, you should disassemble the electrical idea to find the cause. If there is no fault point, the insulation function of the electric idea will drop due to damp, and the baking should be carried out to drive the damp, and the application can not be placed until the insulation is qualified.
2. Measure the resistance of the three-phase winding. Investigate whether the resistance values ​​are similar. If the resistance values ​​are quite different, check whether the motor winding leads have poor contact, etc.
3. Check whether the brake motor machine is qualified. Scroll the shaft by hand to check whether it is flexible, whether there are unusual conflicts, jams, shaft shifting and abnormal noises. At the same time, check whether the components are complete, whether the solid screws are tightened, whether the coupling or pulley is installed and calibrated properly.

2. Brake motor placement and trial operation
Before wiring the brake motor, check whether the control circuit and protection circuit are normal, whether the fuse is suitable, and whether the connection points between the control appliances are firm. As usual, connect the motor power supply and start without load, and investigate whether the motor running direction meets the equipment requirements. If the rolling direction is opposite, only need to switch any two of the power supply wires of the motor terminal board. After starting the experiment normally, connect the motor to the load for trial operation, and check whether the part-time current is normal. If the current is too large, stop the machine for inspection. If the motor does not rotate, the speed is very low, or there is an abnormal hum after the load is loaded, the power should be cut off immediately. If the power-on time is slightly longer, the motor windings may be destroyed, and the control circuit and equipment may be damaged. This is a normal state , The machine is overloaded or stuck, and the electrical appliance is running in phase failure. At this time, the fault should be checked carefully, and the trial operation can only be resumed after the fault is eliminated.