How To E-Stop A Powerflex Drive

[lowdere]

I'm working on a vfd estop application for the first time. I have a belt conveyor driven by a Powerflex 700. Lanyards on the conveyor are for estop.

I'm having trouble understanding exactly what dictates requirements for an estop. Is it acceptable to simply turn off the Enable control signal to the drive, ... or must I install a contactor between the drive and the motor with some sort of relay management module to disconnect the drive safely?

Whatever the answer is... what code dictates my requirements? I have been digging through MSHA, NFPA, and NEC for something, but I have done nothing more than confuse myself.

Thanks,
Eric

 

[ozmosis]

I'm not 100% sure on what the advice should be for a Cat1 situation. I've just been wading through our company advise on Safety Systems (Siemens) and found a useful book (although a fair sized download) on the subject. If it is of use:

http://support.automation.siemens.c...=en&aktprim=99&siteid=csius&extranet=standard

then in the Self-Help area box under 'Product Name or Part number'copy and paste this part number: 6ZB5000-0AA02-0BA1.
This will take you to the page where the Siemens Safety Systems manual can be downloaded (22MB I'm afraid). Of course it's only Siemens products but included is a wealth of technical detail that explains fully most areas of safety and what you should do.
Hope this helps!

 

[moltra]

I copy the following from the PF 70 manual.

"Safe Off Option, the first offering available within the DriveGuard™ series of safety solutions, prevents a drive from delivering rotational energy to motors by integrating a safety circuit with the drive’s power switching signals. This solution meets EN 954-1, Category 3."

The only difference between what I am doing and this is that I am using a seperate safety relay to break the power to the SCR's.