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Can I use the V1k on SCR based drives as well as diode front end drives?

The V1K is designed for use with modern PWM drives where dv/dt and the reflected wave phenomenon is a prevalent issue. Older series current source and SCR based drives incorporate early technology and switching speeds that do not produce as harmful a content of dv/dt and thus would not require this type of device for motor protection. Your drive manufacturer can respond to this question should you be using an earlier series of drive technology.