Starting a used 22KW motor

[Phreezzz]

Hi
I recently purchased an industrial blower (Roots) with a 22KW motor. I am located in a 415v 50 Hz territory.
No control system came with this purchase (OK, it was cheap) and I have a set of six labelled wires from the motor.

Cost of a new star delta starter is greater than I paid for the entire package, and needless to say hurts to have to fork out this much money.
I have found a 60KW starter used for military systems, but it is 60Hz. (Made by Whippell Electrical, England).
Would this device operate on 50Hz? I imagine only the contactors may be problematic, perhaps not have the full pulling power?

Another option I am considering is building a star delta starter from the various components. However this may prove even more costly. I noted another thread on this forum (back in 2004) that had links to various starter schematics.
One of these was for a two speed controller for a 3 phase motor. In effect, and as far as I can see, this is a star delta starter without the time controlled relay. In other words, low speed is the soft start position and high speed switches over to the full load position.

Is my assessment correct? Would a low high speed controller be in effect a 'manual' star delta starter, costing less as I no longer need the time controlled relay and providing me with a low speed motor option?

Apologies if either of above questions have been asked and answered before, but I have searched this forum before posting
Thanks in advance

Phil

 

[itsmoked]

Ah dang! I blew the punch line. DOH!!

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[Phreezzz]

Thanks for the explanation, I thought it was a post, and a warning, not just a sig!
Hey, it made me read the rules more carefully than I would have otherwise, so cant be a bad thing

Thanks again for all the assistance

Phil

 

[waross]

In any industrial that I have been in there was at least one 'hiding place" where the maintenance people would get out of sight when the work load was light. The hiding place is never in the room with the roots blower. Just too noisy.
Comparing roots blower with centrifugal fans of similar HP. , the roots typically has a smaller radius with the resulting lower inertia. Not no inertia, but less than a heavy duty centrifugal fan of equal HP.