G120的A7903故障及预防

近来,在调试中发生一件很奇怪的事,G120驱动5.5KW 的电机,空载运行一点事都没有,有负载时
总是莫名的报A7903,并在过程中,可观测到电机的实际速度由设定一直就升到最大速度,等于就失控了,现在对接地进行了处理,有所好转,但还时有发生

做电机啊识别，与转速优化

电机识别，与转速优化 都已经做过了

关于报警的描述，参考手册中的描述具体排除。
建议几个查找的地方，1、彻底排查速度给定的EMC情况，2、设备良好接地，3、检查并分析负载情况，4、在工艺和保护充分的情况下，适当的调节阈值（参数见下面），5、考虑电机的选项是否偏小，6、检查变频器内电机参数是否有改变，从而改变电机模型。
good luck！！

A07903 Drive: Motor speed deviation
Message value: -
Drive object: SERVO, SERVO_AC, SERVO_I_AC, VECTOR, VECTOR_AC, VECTOR_I_AC
Reaction: NONE
Acknowledge: NONE
Cause: The absolute value of the speed difference from the two setpoints (p2151, p2154) and the speed actual value (r2169)
exceeds the tolerance threshold (p2163) longer than tolerated (p2164, p2166).
The alarm is only enabled for p2149.0 = 1.
Possible causes could be:
- the load torque is greater than the torque setpoint.
- when accelerating, the torque/current/power limit is reached. If the limits are not sufficient, then it is possible that
the drive has been dimensioned too small.
- for closed-loop torque control, the speed setpoint does not track the speed actual value.
- for active Vdc controller.
For U/f control, the overload condition is detected as the Imax controller is active.
See also: p2149 (Monitoring configuration)
Remedy: - increase p2163 and/or p2166.
- increase the torque/current/power limits.
- for closed-loop torque control: The speed setpoint should track the speed actual value.
- de-activate alarm with p2149.0 = 0.

初步确定是电网干扰引起，准备换个电源试试