Hello,
I am looking for a Soft starter with forward/reverse?
Frequency inverters of course have this function but I am looking for a soft starter.
Slow speed and jog operations
Apart from ramping up and down the speed between zero and rated motor speed, Emotron TSA softstarters offer low speed operation in both forward and reverse without additional hardware. Slow speed or jogging forward or backward can be useful for aligning a load or having the motor running at low speeds for test or service purposes. Examples of applications where such low speed or jog operation is valuable are loading/unloading of centrifuges or mixers, or positioning feeding conveyors.
Hello,
I am looking for a Soft starter with forward/reverse?
Frequency inverters of course have this function but I am looking for a soft starter.
There are some reversing solid state starters which do not use contactors. They have 4 additional SCRs which, when turned on, reverse 2 of the phases. Of the total of 10 SCRs, only 6 are turned on at a given time. The extra SCRs and the firing circuits for them add significantly to the cost and reversing contactors are generally cheaper, especially for smaller horsepower units.
Here is a diagram of an Eaton Tru-Start 10 SCR reversing starter.
chopin said:Is it not as easy as to use a relays to revers your phases depending on the requested motor direction
BITS N BYTES said:IMHO VFD's [Frequency Inverters]are a much better solution that "old style" soft starters. AND in most cases less cost and MANY suppliers. I wouldn't waste my time on soft starters anymore.
Yes, I didn't know there were still some of the offered, or I would have mentioned it. Back a couple decades ago, they were cheaper than VFD's. Not so much anymore I imagine.
This would efinately cost more than a VFD
Very true up to about 100hp. BUT, VFD's are not as robust when you have generated power and other issues.