A: 1. Conventional scheme (applicable to 90% synchronous motors on site)
When the elevator starts (zero speed), the motor vibrates. Please reduce P4.17 and increase P4.18 appropriately;
When the elevator starts (zero speed), the motor moves to the heavy side (elevator running backward), please increase P4.17 appropriately and reduce P4.18; if the motor produces slight vibration or noise at this time, P4.21 current compensation coefficient can be appropriately increased to eliminate motor vibration and noise.
If the conventional scheme can not solve the starting reverse slip problem of synchronous motor on site, the following scheme can be tried:
2. Scheme 1: set P4.19 = 20 and P4.20 = 0.5. If the starting reverse slip is improved, the parameter of P4.19 can be increased gradually, and the value of P4.20 is 0.5, which remains unchanged until the start-up does not reverse. If P4.19 = 20, P4.20 = 0.5 is set and abnormal noise or vibration is generated during motor operation, please restore P4.19 and P4.20 to factory values and save parameters.
3. Scheme 2: add F0.17 parameter, add + 2 on F0.17 original parameter, P4.24 = 2, and appropriately reduce P4.25 parameter (- 5 / time, generally set to 35), until maintenance operation, elevator start-up moment does not reverse slip, and save parameters.