Conventional lathe can not start the power supply display is normal, the point of no response, manually press the relay lathe can be normal positive or hair turn.

There should be several possibilities:

1. is the control circuit insurance is not tightened or burned, you can use a multimeter to check the measurement of the resistance of the fuse is zero, infinity when the insurance has been burned, update it.

2. Whether the forward and reverse interlock contact of the relay can be reliably connected.

3. Whether the relay coil is burnt.

4. Whether the connection of each related control loop is reliable.

5. Whether the forward and reverse control switch is damaged.