Catalogs > Industrial Controls Catalog > Motor Control, Solid-State > Soft Starters > SMC™ 50 Solid-State Smart Motor Controllers
SMC™ 50 Solid-State Smart Motor Controllers
| Introduction |  |
Standards Compliance and Certifications | |
Modes of Operation | |
Description | |
Cat. No. Explanation | |
| Product Selection | |
Accessories | |
Renewal Parts | |
Specifications | |
Approximate Dimensions | |
| Product Overview |
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Bulletin 150 — SMC™-50 Smart Motor Controller
Overview
The SMC-50 (Frame B) Smart Motor Controller provides microprocessor-controlled, fully solid-state (SCR, no bypass) starting for standard three-phase squirrel-cage induction or Wye-Delta (6-lead) motors.
Features
- Frame B: 90…180 A range
- Nine standard start modes
- Rated voltage: 200…690V AC
- Three expansion ports to install option modules
- Fully solid-state*, continuous SCR control
- Built-in electronic motor overload protection
- Current and voltage sensing on each phase
- Metering
- DPI Communication Protocol
- Parameter configuration options
- Energy saver mode
- Logging of the last 100 events with time stamp
- Network communication (option)
- External bypass as an option
- Conformally-coated PCBs
Selection Guide
This selection guide/catalog provides minimum information needed to select the proper SMC-50 Smart Motor Controller according to the motor ratings used in the application. For normal duty applications (e.g., pumps, compressors, and short conveyors), refer to the Normal Duty Product Selection tables on Normal Duty Rated Open Type Controllers — For Use with Line-Connected Motors and Normal Duty Rated Open Type Controllers — For Use with Delta-Connected Motors. For high inertia, heavy duty applications (e.g., rock crushers, wood chippers, centrifugal fans, and long conveyors), refer to the Heavy Duty Product Selection tables on Heavy Duty Rated Open Type Controllers — For Use with Line-Connected Motors and Heavy Duty Rated Open Type Controllers — For Use with Delta-Connected Motors. For best selection results in all cases, especially where there is frequent starting and stopping or when it is unclear if the application is Normal Duty or Heavy Duty, it is highly recommended that the free selection tools be used (available at http://www.ab.com/industrialcontrols/products/solid-state_motor_control/software/). For additional assistance, please contact Industrial Controls Technical Support at 440-646-5800.
Product Overview
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The SMC-50 Smart Motor Controller is a micro-processor based soft starter designed to maximize the efficiency of motor starts and stops. Featuring a fully solid-state design, the SMC-50 uses six SCRs (two per phase), which are always engaged (no internal bypass) to vary the conduction period and control the voltage (torque) to the motor during starting, running, and stopping. The starter has many advanced power monitoring and motor/starter protection features to help increase overall reliability. Product scalability is enabled by its three connection ports (Port 7, 8, & 9) to house additional I/O, network communication, or parameter configuration modules (a maximum of three modules). Scalability continues into the configuration of the controller via three different options: (1) a parameter configuration module with limited configuration capability using DIP and selector switches, (2) a multilingual 20-HIM-A6 controller or a panel-mount keypad with LCD display featuring more advanced configuration features, and (3) software that is PC based and network capable (e.g., DriveExplorer) with optimal configuration features. The SMC-50's front panel features a single, multi-colored LED status indicator which provides both diagnostics and controller status information as well as a Push-to-Reset/Hold-to-Test push button which allows manual reset of an actual fault condition, and initiates a tuning cycle or test for fault.
NOTE: A characteristic of AC induction motors is that the current drawn on starting (Start Current = Locked Rotor Current = LRC) is typically 6 to 7 times the running current..Controlling the voltage applied to a motor also controls the applied current, where the % change in applied V is approximately proportional to the % change in current (I). Current (I) controls the full load torque (FLT) produced by the motor where the % change in I2 is approximately equal to the %FLT change in motor torque. In other words, the % change in V2 is approximately equal to the % change in the motor FLT. It is vital to understand that controlling the voltage applied to a motor modifies the motor torque for successful soft starting. When a motor starts, it typically develops 180% of its FLT and draws 600% of its full load current.