Does anyone know what OSHA, NFPA, or NEC codes mandate as far as E-Stopping motors driven by Inverters or DC motors run by drives? Is there a national standard or is it a 'local regulations' issue?
I've dealt primarily with imported Eurpean machinery for the past 10 years, and I've seen contactors between ac drives and the motor, contactors before the drive killing power to the drive on e-stop, and most recently circuits letting the drive 'fast-stop' the motor and then opening a contactor between the motor and drive. They LOVE electro-mechanical brakes so coasting is usually not an issue with these motors.
I'm not a big fan of killing the power to the drive for an e-stop myself, but haven't really heard or read anything one way or the other.
I'm not doing a project or designing anything, I was just relaxing on my day off here and thinking about motors and drives (WHAT HAS BECOME OF ME!!!) and thought about the many methods I've seen and wondered what some of your opinions are.
Any of you drive reps ""DickDV"" know how this is supposed to be done? Also if you buy a European machine and it's not done to the American standard, does it have to be changed? or is it ok since it wasn't built here?
Hope you all are having a wonderful weekend!!
Chris
I've dealt primarily with imported Eurpean machinery for the past 10 years, and I've seen contactors between ac drives and the motor, contactors before the drive killing power to the drive on e-stop, and most recently circuits letting the drive 'fast-stop' the motor and then opening a contactor between the motor and drive. They LOVE electro-mechanical brakes so coasting is usually not an issue with these motors.
I'm not a big fan of killing the power to the drive for an e-stop myself, but haven't really heard or read anything one way or the other.
I'm not doing a project or designing anything, I was just relaxing on my day off here and thinking about motors and drives (WHAT HAS BECOME OF ME!!!) and thought about the many methods I've seen and wondered what some of your opinions are.
Any of you drive reps ""DickDV"" know how this is supposed to be done? Also if you buy a European machine and it's not done to the American standard, does it have to be changed? or is it ok since it wasn't built here?
Hope you all are having a wonderful weekend!!
Chris