Soft start and soft stop

Soft start and soft stop – Overview

What is a soft starter?

A soft starter is an electronic motor control device for the soft start and stop of three-phase induction motors.

The motor voltage is adjusted with a phase control by a ramp function. The supply frequency of the motor remains identical to the mains frequency.

With soft starting, the initial voltage (= starting torque) and the voltage rise (= acceleration) are adjustable.

During soft stop, the voltage is reduced with a ramp function.

All KIMO^® soft starter (soft start & soft stop) in an overview

KIMO Fig. Drehzahlregelung am Beispiel der Lüftertechnik

Applications

Soft start and soft stop devices are used wherever motors – as mentioned above – need to be started or slowed down gently. Pumps and conveyor belts are perhaps obvious examples.

However, the following articles also show other areas of application:

Start attentuation (AM) and soft starters (SM, SM2)
0.5 – 7.5 kW

SoftCompact^® AM, SM

Features

1- or 2-phase controlled
AM : Start attenuation with bridging relay
SM : Soft start with bridging relay for single-phase capacitor motors
SM2 : Soft start with bridging relay and soft stop
Switch-on torque and run-up voltage ramp separately adjustable
Module housing for mounting on 35 mm DIN rails. Very compact version with a width of 45 mm.
With integrated bridging contactor
Easily retrofitted
Can be used as a combined soft-start and injection brake using the electronic brake modules LEKTROMIK B1