- info@blemo.com
- 06106-8295-0
A range of devices from 0.37 to 55 kW.
With 3 to 110 A rated current for asynchronous motors.
Voltage ranges: 110 to 480 V, 1~ and 3~, power ranges: 0.37 to 55 kW.
Softstarter SH21
The soft starters of the SH11/21 series ensure smooth starting (SH11) or starting and stopping (SH21) of asynchronous motors. This avoids torque surges due to the otherwise abrupt starting torque, current peaks during switch-on and voltage dips in the mains and reduces wear on the mechanical drive elements. The SH11 series soft starters for progressive start-up are used with single-phase and three-phase motors when jerk-free starting is desired.
The SH21 series of 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 in single-phase and three-phase motors. The soft starters are designed for a voltage range of 110 to 480 V and can therefore be used universally.
In contrast to electromechanical starters, the electronic starters of the SH11/SH21 series allow the adjustment of the starting torque and the starting time. The soft starters are particularly suitable for conveyors and conveyor belts, automatic doors, drag lifts, small gantry cranes, fans, pumps, refrigeration compressors, compressors and machines with high inertia and all machines with belt drive.
Functional description
With the soft starters of the SH11 series, the current in one phase, with SH21 in two phases, is controlled time-dependently by an increasing voltage ramp.
The starting torque can be set via a potentiometer.
The run-up time is set as required via a second potentiometer.
With the SH21 devices, the run-down time can be set via a third potentiometer. SH21 devices also have a relay output that indicates the status of the soft starter.
After start-up, a built-in bypass relay bypasses the electronics and the motor runs directly on the mains.
