want to know about working of soft starter for motor control?
want to know about working of soft starter for motor control?
(OP)
can someone tell me about the working and design of soft starter panels. if somebody has some material on it please let me know.





RE: want to know about working of soft starter for motor control?
1. Soft-starting panels are widely used and available off the shelfs.
2. Check
http://www.ab.com
http://www.squared.com
http://www.siemens.de
http://www.ge.com
http://www.alstom.com
http://www.abb.com
http://www.eaton.com
and many smaller motor control companies available over
http://www.thomasregister.com
for a better price.
RE: want to know about working of soft starter for motor control?
Soft starts are usually applied when a (relatively) large motor is run on a (relatively) small power system. In other words, if a single motor's full load power is equal to 25% or more of the rated capacity of the transformer feeding it, then unacceptable voltage sag results when the motor is started at full voltage. A soft start will eliminate this problem and will allow motor full load to equal transformer full load. (25% figure given above is a ballpark number, if others in the forum have more specific info please post it)
As well, soft starts may be applied to systems where it is desirable to reduce the mechanical shock of full voltage starting by gradually ramping up to speed.
Finally, soft starts may be used on large motors (>1000hp) to increase the # of allowable starts per hour. Heating is the limitation for # of starts in large motors. By limiting starting current you reduce the heating significantly and may obtain more starts per hour.
I hope this helps.
RE: want to know about working of soft starter for motor control?
1. To include y-delta starters under soft starting
2. To include other power electronic principles in addition to the above posting, e.g. motor variable speed drives.
3. Visit
http://www.manufacturing.net/magazine/dn/supplements/motion/soft.htm
for more info on soft starting.