Your motor is 4 HP (3 KW) but the generator set is 7 KW. You can not start the motor with DOL start. See the previous thread http://cr4.globalspec.com/thread/45119.
For direct starting you need at least 12 KW generator. You can buy a VFD to start it.
- MS
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"All my technical advices in this forum must be consulted with and approved by a local registered professional engineer before implementation" - Mohammed Samad (Linkedin Profile: http://www.linkedin.com/in/msamad)
It is almost certain that you CAN start and run your compressor from the 7kw gen... but one has to know how. So lets make some checks first. I assume that you have a standard 3 phase, class "B" industrial induction motor. So here is what you do.
1) Disconnect your motor shaft from the drive-train to compressor and start your motor completely unloaded. If your motor will start and run, then you can start your compr. with the 7kw generator. Read on.
2) Drive your compressor (V-belt drive preferable) through a hydrodynamic coupling, better known as a fluid coupling. The company you buy the fluid coupling from will give you a fully engineered drive design, so you do not need to bother with anything. This will cost much much less than replacing the generator. (Contact Rexnord-Falk.)
3) If your motor will NOT START fully unloded, then indeed there is a gen. problem. Provided you use a fluid drive, a replacement gen. will need to be much less than 12 kw.
4-hp Compressor
Re: 4-hp Compressor
