For other starting methods (electronic soft starter, start reactor, etc.) the following is valid: the mains current during the start equals the motor current. Due to the fact that our starter is

Control supply voltage (Us), is the voltage feeding the electronic com- ponents inside the softstarter, for example the printed circuit board. A common volt- age is 100 - 250 V AC. Control circuit voltage (Uc), is the voltage for controlling the start and stop command of the softstarter. Common values are 24 V DC or 110 - 240 V AC.

A solid-state soft start controller or starter controls the starting torque and current of an AC motor electronically . They can be used in almost any application such as: • Commercial—HVAC fans and pumps • General industrial—fans, pumps, conveyors, material handling, and processing equipment

Reduced Voltage Starter; it reduces the supply voltage during motor startup to reduce the inrush current. The soft starter uses this technique to start an 

Calculate the Design current (load current) = KW/ (1.73 X 400 X p.f X eff.) = In b. Apply all applicable correction Factors, say Ct. c. Determine the protective device rating. = In if the intention for Overload protection and Greater than In if for O/C in general. d.

This module computes the motor start-up in unlimited networks and offers the Saturation and eddy-current losses in the motor allowed for (linear or 

The current is more regulated using a soft starter. With a DOL there will be larger spikes in current as the motor starts. With a soft starter, the time the motor gets us to speed is slower and more controlled. While a DOL gets the motor up to speed almost instantly. This can have undesirable effects that we will talk about next.

We presume, you've carried out the motor starting study with your other base load ON and established the Voltage drop at the bus.

How to Calculate Motor Start Up Current? · First, determine the rated power (watts). In this example, the rated power (watts) is determined to be 415 . · Next, 

A solid-state soft start controller or starter controls the starting torque and current of an AC motor electronically .

12/3 · Sometimes named pedestrian voltage or torque, this is the point from where the softstarter starts or stops its ramps. The torque of the motor will drop with the square of the voltage and if the voltage is set too low, for example 20 %, the starting torque will become 0.22 = 0.04 = 4 % only, and the motor will not start from the very beginning.