Soft Starters

Soft starters are used on equipment that causes a high current inrush during start-up. Typical examples are large fans, compressors, lifts or chillers. Sometimes they are also used for smooth stopping and starting of conveyors and pumps. REO offer two types of control methods for soft starting; phase-angle control or current limiting. The latter technique employs microprocessor technology.

VAREOSOFT SAG M300 Soft Starters with current limit control

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These soft starters are microprocessor controlled and are designed to work with asynchronous motors connected in open delta configuration. By using this technique the soft starter can handle more power than when connected in a conventional star circuit. Motors of up to 55kW open delta (37kW star)can be controlled with this range of units.

The M300 range limits the current during start-up and so it is more efficient. All settings are made through a touch panel which incorporates an LED display.

They protect the mains supply from sags and damaging surges (transients), while reducing the current demand during start-up.

VAREOSOFT SAG Soft Starters

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This range of controllers is suitable for 3-phase asynchronous motors with up to 160kW power rating. Phase angle control is used and there are simple trimmers for adjusting the ramp up time, starting torque and the ramp down time (for dynamic loads that can be powered down).

These units are very easy to install, in series between the supply and load. An integral by-pass contactor is built into the unit, therefore an additional mains contactor is not required. All three phases are controlled and there are output signals, for when the controllers has reached the top of the ramp and for fault conditions such as over temperature

VEROSOFT SAG-6 for Hydraulic Lifts

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The VAREOSOFT SAG-6 range for hydraulic lifts is comprised of electronic motor control units for AC asynchronous motors, with open delta connection (6 cable circuit). VAREOSOFT SAG-6 for hydraulic lifts can be used for soft starting AC asynchronous motors. The unit operates on the phase angle control principle. The soft start can be achieved with an adjustable voltage ramp. The starting moment can be adjusted separately. The basic unit is supplied without a motor contactor but this can be offered, in an advanced version.