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For every motor, some form of electrical control is required, from simple ON/OFF to more complex variable speed applications. Motor control devices encompass simple manual controllers, motor contactors and starters, drives and soft starters.
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Motor Controls
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AC and DC motors are used throughout industry in a wide range of applications. Conveyors, pumps, fans, blowers, drills, cranes, augers, and more all use motors to provide the needed motion with the necessary torque and speed. Motor control devices provide a method of controlling these motors, and vary from simple ON/OFF, all-or-nothing control to advanced speed control using variable frequency drives (VFDs) and soft starters.
Motor Controls Overview
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IEC Magnetic Motor Starters
IEC motor starters are used to operate polyphase induction motors and protect them against running or stalled overcurrents, with components that meet IEC standards. Configurations include open frame units or starters in pre-wired enclosures, from brands such as WEG and Eaton.
IEC Manual Motor Protectors
IEC manual motor protectors provide an all-in-one motor control/protection solution integrating control, disconnecting means, and circuit protection. A full line of accessories includes shunt trips, external handles, and mounting hardware.
IEC Magnetic Contactors
IEC magnetic contactors provide electrically operated load control for diverse load switching needs. Contactors are available in capacities up to 400A, from brands such as WEG, Fuji, Eaton, IronHorse, and AutomationDirect. Miniature contactors offer high horsepower ratings in a small footprint, while safety contactors feature mechanically-linked contacts to provide safe operation of machines and equipment.
IEC Overload Relays
IEC overload relays provide reliable and accurate electronic or thermal protection from device or component overload or phase loss. Units from various brands are available in a range of amperage capacities, with certain models offering configurable parameters, self-powered operation, and communications capabilities.
Definite Purpose Contactors
Definite purpose contactors are designed for application-specific use, such as HVAC or compressors, providing reliable load control that can handle diverse switching needs. These compact contactors are available in up to 60A capacities, in 1- or 3-phase configurations, and with coil voltages from 120 to 480 VAC.
Motor Disconnects & Controllers
Manual motor controllers and disconnects safely control and disconnect power from motors. UL 508 rated open frame and enclosed devices are available from reliable brands including Bryant, Merz, and Socomec.
Pin and sleeve interlocked motor disconnects provide convenient and safe connection for mobile equipment.
Motor Control Relays
Motor control relays perform protective functions for motors and components to ensure proper and efficient operation.
- Phase monitoring relays detect faults in a 3-phase system
- Alternating relays balance load usage
- Pump seal failure relays monitor pump shaft seals
AC Variable Frequency Drives (VFD)
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A wide range of AC variable frequency drives (VFD) is available for motor speed control and other industrial control applications.
- Micro variable frequency drives (VFD) enable speed control for AC motors at an affordable price in a compact footprint.
- General purpose variable frequency drives enable speed control for AC motors such as those in conveyors, fans, pumps and material handling.
- High-performance AC drives offer advanced features such as STO, closed-loop vector control and a built-in logic controller.
- NEMA 4X-rated drives are suitable for washdown-duty applications. They offer V/Hz, sensorless vector or field oriented vector control up to 30hp.
AC Motor Soft Starters
Solid state soft starters provide many advantages when used instead of electro-mechanical contactors, including reduced shock and starting stress on motors, resulting in an extended motor lifespan.
- Compact soft starters offer a reduced footprint for solid state motor control in ratings up to 85A (depending on series). Starters are available for 1- or 3-phase motors.
- Basic soft starters provide dependable performance on motor starts and stops, in ratings up to 412A (depending on series) and a selection of trip classes
- Full-featured soft starters are fully digital, and use thyristors in all three motor phases for controlled reduced voltage motor starting and stopping; available in ratings up to 477A, and AC or DC control voltages
DC Drives
IronHorse DC drives can accommodate from 1/50hp @ 12 VDC out (with 12 VDC in) up to 3hp @ 180 VDC out (with 240 VAC in). DC motors and drives can provide several advantages:
- Inexpensive
- Low speed performance
- Low speed power
-
Simple
- DC drives typically use potentiometers for configuration
- No parameters or programming needed (for most models)
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