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Appreciate you both for replying. There's no vibration whatever to the chasis in question. And yes, cards are locked in with the tabs. I have been using the -asb user manual as a guide. Roy- that's a good catch on that Modicon. Isn't it typical how a simple installation error would cause so much...

Hello Controldude. I personally checked all the terminators and proper termination on the io link and chasis grounding. I even checked each point with a scope, and there was no indication of ground loop, reflected signals, congested or excessive attenuation. The timing of the fault appears...

Hi Roy. These remote racks are housed in several cabinets in the field. Each cabinet has a UPS which feeds a 24VDC PS. This PS then feeds the in-chasis AB PS and all I/O power for that cabinet. So, yes, voltage return is common to all.

I have an AB plc5 with remote racks which intermittently giving me rack fault. Nothing we've done so far works. We even had a rep from AB to come out to to look over our DH+ network, but he's stumped. At this point I'm entertaining the idea of isolating my discreet I/O field wiring, and...

Thank you all for your suggestions. It'll be a few more days before I can get my hands on the motor for further testing. Here are some more details that have been asked for through the thread: The motor was purchased new 01/01 and has not been reworked. Actual RPM is 588-591. Nameplate RPM is...

I have a 125 HP, 600 RPM, 480/60/3 225 FLA induction motor driving a piston compressor. It keeps tripping on O/L (set at 234A). I put a power analyzer to it, and this is what I got: 81 kW, 175 kVAR, 193 kVA, 0.42 PF, 3 phase A 231/231/231, 3 phase U 482/482/482. Does this sound like a defective...