Hey all, new conveyor panel coming in for our infeed line. PowerFlex 525, 5 HP, a 440R dual channel relay for the two E-stops. Our old panels all have a 100S contactor the relay drops.

The panel builder wants to drop the contactor and take the relay outputs straight to the drive's S1 and S2 terminals. Saves panel space and a part, and he says the drive's STO "is rated for it". I asked for the certificate and got a brochure.

I've read the safety section of the 525 manual twice, and on the bench unit with a 5 s decel set the drive just coasts on STO. Our safety guy is out for three weeks.

Half of me says STO is enough these days, the other half says keep the contactor. Which is it? The conveyor is flat, no incline, no brake. Not sure what I should be asking the panel builder for either, because a brochure isn't going to do it.