Soft starter with internal bypass

Soft starters traditionally use solid-state, silicon-controlled rectifiers (SCRs) to control voltage to the motor during startup, runtime and shutdowns. The reduced torque and current slowly introduces energy to the motor, mitigating electrical and mechanical stress to the application. If these SCRs remain in the circuit once the motor is up to speed, the heat generated by these devices leads to electrical inefficiency.

“Now, users have the option of choosing the proper power structure for their application when purchasing the SMC-50 smart motor controller. For operations that run over an extended period, built-in internal bypass allows users to shift from solid-state switches to bypass contactors,” said Rick Anderson, product manager for Soft Starters, Rockwell Automation. “By switching over to the bypass circuit, users can save on energy and decrease operational costs by minimising excess heat buildup.”