SMC™-50 Solid-State Smart Motor Controller
This document serves as a selection guide for the Rockwell Automation SMC-50 Smart Motor Controller, a micro-processor based soft starter designed for three-phase squirrel-cage induction or Wye-Delta motors. The controller features a fully solid-state design using six SCRs to vary conduction periods and control voltage during starting, running, and stopping, eliminating the need for an internal bypass contactor.
The guide outlines various modes of operation including Torque Control Start, Linear Speed Acceleration, Soft Start, Pump Control, and Dual Ramp Start. It provides product selection tables for both normal duty applications (such as pumps and compressors) and heavy duty applications (such as rock crushers and long conveyors), along with information on optional modules and network communications.
| Voltage Range | 200...690V AC |
|---|---|
| Current Range | 20…690V 90…520 A |
| Control Type | Solid-state (SCR) |
| Motor Types | Three-phase squirrel-cage induction or Wye-Delta |
| Expansion Ports | Three |
No, the SMC-50 Starter is fully solid-state with no integrated bypass, though an external bypass contactor can be added as an option.
The rated voltage is 200…690V AC.
It offers nine standard start modes.
The maximum current rating is 520 A.