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The soft starters of the SH series provide jerk-free starting or starting and stopping of asynchronous motors. This avoids torque surges due to the otherwise abrupt starting torque, current peaks when switching on and voltage dips in the mains and reduces wear on the mechanical drive elements.
The SH1 series soft starters for progressive start-up are used with single-phase and three-phase motors when jerk-free starting is desired.
The SH2 series soft starters for progressive run-up and run-down are used to control the starting torque, to reduce the starting current and for controlled run-down.
The device types SH2- ../690 from 30 to 75 A are designed for a particularly wide voltage range from 208 to 690 V and can therefore be used universally.
In contrast to electromechanical starters, the electronic starters of the SH series allow the starting torque to be adjusted.
SH1 soft starters for progressive start-up are particularly suitable for conveyors, automatic doors, drag lifts and machines with belt drive.
Soft starters SH2 for progressive run-up and run-down are used for fans, pumps, refrigeration compressors, air compressors and machines with high inertia.
With SH1 series soft starters, the current is controlled in one phase, with SH2 devices in two phases, time-dependently by an increasing voltage ramp.
The initial value of the voltage ramp – and thus the breakaway torque – can be adjusted via a potentiometer.
A second potentiometer is used to adjust the ramp-up time according to the requirements.
With the SH2 devices, the deceleration time can be adjusted via a third potentiometer. SH2 units also have a relay output that indicates soft starter operation.
After start-up, a built-in bypass relay or contactor bypasses the electronics and the motor runs directly on the mains. This contactor drops out when the stop command is given, regardless of whether the run-out is free or controlled.