No snatch from MPU-controlled soft starts
A
REO product story
Edited by the Engineeringtalk editorial team
Feb 28, 2002
The Vareosoft range of soft starts from Reo has been extended by the addition of the microprocessor controlled SAG M series.
The Vareosoft range of soft starts from Reo has been extended by the addition of the microprocessor controlled SAG M series.
These soft starts will eliminate the high torque, delivered at full load, on start up of a motor which creates the customary "snatch" that can result in wear and mechanical damage to couplings and transmission equipment.
In eliminating this jerking movement the SAG M series is ideal for reducing stress in the mechanical transmission of applications involving pumps, fans and compressors.
The new SAG M is designed for three-phase AC motors in three and six line connection.
It uses six high power thyristors, to gradually increase the voltage applied to the motor, starting slowly and limiting start up currents.
Once the adjustable ramp up time has been reached, the thyristors are bypassed via a contactor so that the mains voltage is applied directly to the motor.
This means the thyristors are not in continuous operation, as with most electronic soft starts, and no additional cooling is required.
This feature, coupled with the small size of the starter, means panel space is kept to a minimum.
The soft starters can also be used to ramp down where heavy dynamic loads are encountered.
Soft starter operation uses the principle of phase angle control.
This technique uses triacs and thyristors with the level of voltage delivered by the control system being determined by the point on the mains sinewave at which the device fires.
The longer the line delay, or greater the firing angle, the lower the output voltage.
The device switches itself off as the current drops to zero and is fired again on the next half sine wave.
Reo's SAG M soft starts control all three phases in this manner.
Reo offers the SAG M in six sizes ranging from 7.5 to 37kW.
Further Vareosoft soft starts are available up to 160kW.
Acceleration and deceleration ramps are variable between 0 and 60s and starting torque is adjustable between 0 and 100%.
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