3 phase Motorboss soft start
3 phase Motorboss soft start
(OP)
I am designing a new starter/control system for a 3000 psi hydraulic power supply with a 3 phase, 460Vac 100hp motor. I have been looking for something more efficiant than a star delta and found the Motorboss soft starter sold by Advanced Motor Power, www.advancedmotorpower.com, has anyone ever used one of these before?





RE: 3 phase Motorboss soft start
Read the following FAQs and look through previous discussions on this forum.
Energy Savers for Induction Motors FAQ237-971
How to select the correct motor starting method - Overview FAQ237-1029
What is a Soft Start? FAQ237-1064
RE: 3 phase Motorboss soft start
RE: 3 phase Motorboss soft start
RE: 3 phase Motorboss soft start
JRaef.com
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: 3 phase Motorboss soft start
RE: 3 phase Motorboss soft start
RE: 3 phase Motorboss soft start
RE: 3 phase Motorboss soft start
RE: 3 phase Motorboss soft start
cbarn24050's explanation is correct, except it is also possible to indirectly calculate current that way as well. Allen Bradley did that for years with their SMC product line (prior to the SMC Dialog and Flex), even to the point of providing overload protection. It's a very old technology dating back the the earliest days of soft starters, but most manufacturers abandoned it for the following reason. Once a bypass contactor pulls in you lose ALL ability to sense current. That is why the AB SMC's required an "adaptor module" and an external OL relay if you used a bypass contactor. The Powerboss apparently has the same problem, that is why they barely mention the issue of using bypass contactors; they require additional hardware for protection AND they completely negate their "energy saver" function, the main thrust of their sales pitch.
JRaef.com
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: 3 phase Motorboss soft start
RE: 3 phase Motorboss soft start
RE: 3 phase Motorboss soft start
I agree with GGOSS though, the Motor Buss functionality as a soft-starter seems weak and the major manufacturers all have an energy saving function. The price seems high for what you get.
RE: 3 phase Motorboss soft start
Regards,
GGOSS