Rockwell's Allen-Bradley SMC-50 smart motor controller offers advanced soft-start​er functions

Rockwell Automation's Allen-Bradley SMC-50 smart motor controller includes a newly designed three-phase, fully solid-state, silicon-controlled rectifier (SCR) power structure. The SMC-50 controller addresses the motor control needs of OEMs and end users seeking a more economical alternative to drives and more advanced control than across-the-line starters. The SMC-50 controller combines advanced monitoring and protection features, multiple start and stop options, and expandable control inputs and outputs.

Rated at 200V-690V AC and with software from 90 to 520 amps, the SMC-50 controller is designed for controlling motor speed and torque in a range of normal-duty applications.

For application scalability, it features nine standard starting modes, six stopping modes and several slow-speed functions. In traditional starting mode, for example, if the SMC-50 controller senses that the motor has reached full speed before completing the selected ramp time, it will automatically switch to providing full voltage to the motor. The linear-acceleration starting mode offers the lowest starting current profile per start, consistent acceleration time, and enhanced control over both torque and speed. Regardless of the starting mode chosen, the SMC-50 controller stores the actual motor start time and peak current value to assist in setup and process optimization.

Depending on the application, controlling voltage during motor stopping is equally critical to controlling voltage during motor starts. For example, the SMC-50 smart motor controller using the Allen-Bradley smart motor braking feature engineered with automatic zero-speed shut-off, quickly stops a motor without the need for additional hardware or feedback devices.

To further protect motor assets and decrease downtime, the SMC-50 controller uses advanced power monitoring and diagnostics. This results in highly scalable user-configurable faults and alarms, including motor overload protection, over/under voltage, stall protection, over/under power, jam detection, over/under current, excessive starts, current and voltage imbalance, power frequency protection, power factor protection, and preventative maintenance faults and alarms. The SMC-50 controller also boasts features such as energy saver, motor winding heater, and the snapshot and event log features, which capture fault, alarm and operational history.

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