Why Solid State solution for motor control ?

Motor control has always been something difficult to tackle with as a motor is first of all an inductive type of load with high starting currents (which doesn’t help reduce size and costs of protection devices like fuses) and over voltages generated at turn-off.

This is why Solid State solutions are more and more popular to control motor loads. Another big advantage of using power electronics is that numerous control modes can easily be performed thanks to very fast response time, and computing power of micro-processors.

celduc® Relais specialising in Solid State Relays manufactures in France with a high level of quality a complete range of Solid State Contactors for motors, as well as soft starters and motor reversers.

Soft Starters:

Drawbacks of direct starting are as following:

-High inrush current: Heat, flicker risks, energy and installation costs
-Noise, arcs: Short control lifetime and maintenance costs
-High transient torque: Excessive wear of the coupling parts leading to maintenance costs
-Quality problems and product wastes may occur

A Solid State soft starter will then limit the starting current hence saving energy. It will at the same time limit torque for a longer lifetime of mechanical parts.

celduc® Relais has designed a range of soft starters for AC motors up to 26 kW (wired in Delta).

Motor reversers:

Several models of reversers are available in the product range of Celduc® Relais up to 7.5 kW. They have the interlocking function and over-voltage protections integrated. A larger rating will be available soon in 2008.