Motor Control Panels
Designed to your specific requirements
We have the experience to design motor control centres and control panels to your specific requirements. Utilising soft start units, variable speed drives, (Inverters), PLC’s, interfacing with instrumentation and providing telemetry.
ide’s Motor Control Panels feature:
- Direct On Line, (DOL), motor starters up to 18.5kW as standard.
- Star-Delta motor starters from 7.5 to 30 kW as standard.
- Single motor / pump control.
- Dual motor / pump control, (Standby and or Assist).
- 2 wire and 3 wire remote / automatic start stop control for use with level switches and process instrumentation.
Direct On Line (DOL)
A basic form of motor starting, this applies the full line voltage directly to the motor terminals when the motor is required to run. Usually used on smaller motors when the starting inrush current does not cause a detrimental voltage drop of the supply. The supply circuit often dictates the maximum size of motor that is practical to start using this method. Three power conductors are used to connect the motor to the starter, and applications commonly include pumps, fans, and compressors.
Star Delta (SD)
A form of 400/600V Three Phase motor starting for motors too large for use with DOL starters. A star delta starter applies the supply voltage to the motor in two stages, the first with the motor connections in a star configuration resulting in reduced torque, but also a reduced current surge and volt drop on the supply circuit. The second stage, (after the motor has begun to run up to speed), switches the motor windings from a star to a delta configuration. This will cause a second surge on the supply circuit, but it will be lower than that of a DOL starter. Care must be taken during commissioning to set the time delay between Star and Delta to suit the application and reduce the starting surges as far as possible.
The correct type of motor must be chosen where the delta configuration voltage, matches the supply voltage. 6 power conductors must be used to connect the motor to the starter. As with DOL, applications commonly include pumps, fans, and compressors.
Soft Start (SST)
Soft Starts are connected in the same manner as a DOL starter, and can be thought of as an electronic system offering similar, (and enhanced), benefits of the Star-Delta starter. When the motor is required to run, voltage is supplied at a low level and gently ramped up to full voltage. This results in a smoother start for the motor, limiting torque and current peaks. Most models have the facility to control a soft stop of the motor, and high end models can offer torque control and motor protective functions beyond the thermal overload relay associated with DOL and Star-Delta starters. When the motor is up to full speed, a bypass contactor is often employed to switch the soft start out of circuit thus considerably reducing maintenance schedules and maximising the life of the soft start unit. Applications commonly include pumps and conveyor systems.
Variable Speed Drives (VSD)
Variable speed drives or inverters, are also connected in the same manner as a DOL starter, unlike a soft start using voltage control to gently start and stop motors, the VSD uses frequency control and can continuously vary the speed of a motor to match process conditions.