7、 变频器的接地应该与PLC控制回路单独接地，在不能够保证单独接地的情况下，为了减少变频器对控制器的干扰，控制回路接地可以浮空，但变频器一定要保证可靠接地。在控制系统中建议将模拟量信号线的屏蔽线两端都浮空，同时由于在机组上PLC与变频器共用一个大地，因此建议在可能的情况下，将PLC单独接地或者将PLC与机组地绝缘开来。

   8、变频器的接地
   400V级：C种接地（接地电阻10Ω以下）。
   接地线切勿与焊机及动力设备共用。
   接地线请按照电气设备技术基准所规定的导线线径规格。
   如35KW的变频器接地线线径推荐为22 mm2，87KW的接地线线径推荐为50 mm2。
   接地线在可能范围内尽量短。由于变频器产生漏电流，与接地点距离太远则接地 端子的电位不安定。

备货，备货，降降降，火火火，火火火……

————————————————————————————————

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