Soft starting and stopping of 3-phase induction squirrel cage motors.   
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The Carlo Gavazzi RSHR is your solution for soft starting and stopping 3 phase induction motors! This is a compact easy-to-use AC semiconductor motor controller. 3-phase motors with nominal load currents up to 45 A can be soft-started and/or soft stopped. You can adjust starting and stopping time, as well as initial torque, with built-in potentiometers. The RSHR Midi controls 2 phases only, one phase is continously connected to the load. Soft starting and soft stopping is achieved by controlling the motor voltage. During running operation the semiconductors are bypassed by internal electromechanical relays. Starting and stopping time as well as initial torque can be independently adjusted by built-in potentiometers. LEDs indicate the status of the controller including an alarm status in case of overtemperature in the RSHR...V21 models. The RSHR Midi comes with an integrated heatsink and is ready to mount on DIN rail. When used on a typical 400VAC supply, the 3-Phase controller can soft-start and soft-stop 3-phase motors up to 22kW (30HP) when connected In Delta and up to 15kW (20HP) when connected In Line. All 3-phases are switched. Starting and stopping time as well as initial torque can be independently adjusted by potentiometers on the facia. A version adapted for starting Scroll Compressors is also available. This device does not include internal bypass relays but provides a relay contact to help energise an external bypass contactor. Please see the attached data sheet for a list of all available soft starts. Part numbers not available to order online may be special ordered with a lead time of 7-8 weeks. |
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