I need to modify a piece of equipment to include a circuit for an additional piece. The equipment is powered at 460VAC, 3-phase. The original equipment contains one step-down xfmr to 120VAC, and is protected by two primary and one secondary fuses. The add-on is 120VAC, nearly 10A max inrush...
I have a report of two of the three motor phase terminals in a motor contactor being fused (shorted by melting) together. Twice in a row, same machine, same motor, same phases.
This is on a machine in the field. I was thinking it could be a short in the motor windings. We are operating...
I am redoing a cabinet layout. We are using a different control transformer that is larger, and so the fuse holder that was formerly mounted on top of the transformer is being replaced by two DIN-rail mounted fuse holders (2P primary + 1P secondary). I am wondering what the proximity...
Hi all. I have been working with a softstarter fault issue on my company's equipment for over a month now. The softstart is an Allen-Bradley SMC-3, and the fault is four-flash Phase-Loss/Open Load. I have initiated one fix so far, which initially reduced the faults entirely. What I suspected...
Our machinery normally uses 460V, 3-phase supply. We have come across an instance where customer only has 208V, 3-phase, and not a hope of changing. I am in the process of converting the equipment. Someone suggested wiring the 460V motors in the delta configuration. Any advice?
I have a dumb question: In our control cabinet, we run several motors off the 3phase, 460V line. I need to add another branch circuit. I have the motor starter, reverser, motor, etc, but what do I do about the wiring? I've noticed that the terminals of the other motor starters use two wires...
I am designing a simple test setup with an Crouzet PLC. I am concerned about fusing and voltage spikes or bounce that would damage the PLC or other components, or give false reads on the PLC inputs. I have no control, at this point, over the PLC code. I would like to mimic as close as...
