It is necessary to confirm whether the wiring and power supply of the equipment are normal, and whether the elevator is controlled when the no-break board is not connected to the 3P line (the normal state is controlled).

For example, in the controlled state, the ladder is not controlled after the 3P cable is connected to the ladder control device, and the ladder control device works normally in the open state, then it may be judged that the ladder control product is faulty.

In the case of uncontrolled state, it is necessary to check whether the status of the wire rod and the elevator is normal, confirm whether the on-site break free wire board can be replaced, and carry out the exchange test.

If there is no test equipment that can be switched, it is necessary to confirm the positive and negative line sequence of the field signal line, and send it to our after-sales personnel to confirm whether it matches the fail-proof wire board. If it does not match, it is necessary to customize the fail-proof wire board. If it matches, it may be the fail-proof wire board fault.