Medium Voltage RediStart Micro: MVRSM12 / 18 Series

The Medium Voltage RediStart Micro is a microprocessor controlled solid state reduced voltage starter for three phase medium voltage induction motors. The Medium Voltage RediStart Micro operates on a user specified current ramp for optimal motor control and protection. This type of operation is referred to as closed loop current control. The motor is accelerated from an initial current setting to the maximum current setting during the defined ramp time.

Current Ramp mode is recommended for high inertia and heavy load applications where full motor torque is required to accelerate the load. For this mode, the maximum current setting should be set at 600%. This current setting delivers more than enough current to the motor to develop full motor torque. NOTE: Even though the maximum current is set at 600%, this maximum will only be reached if the motor requires 600% to achieve full speed. Ramp time is also a factor in determining whether or not maximum current is reached.

Constant Current mode is recommended for light loads, or when the power supply is limited. The motor must not require full torque to accelerate the load under this constant current mode. For this mode, the maximum current setting may be reduced to deliver the required starting torque to the motor. Setup should be done under worst case load conditions to ensure acceleration to full speed under all load conditions.

Benshaw, Inc., 1659 East Sutter Road, Glenshaw, PA 15116. Tel: 412-487-8235; Fax: 412-487-4201.