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  1. ReliabilityTech

    Pull cords & Conveyors

    itsmoked: It's my understanding that you would want your controlled stop to be just that, a slow, ramping, controlled halt to the conveyor. The e-stop input would have different characteristics in its stopping curve. Likely your normal stop function would have a timer to ensure all material is...
  2. ReliabilityTech

    Pull cords & Conveyors

    I appreciate the responses. And yes, I should have mentioned that this conveyor is/will be VFD driven. I guess I am set in my ways of its predecessor which had a multi-conductor teck running along the length of the conveyor, picking up devices (side travel, horns, pull cords, etc.) which were...
  3. ReliabilityTech

    Pull cords & Conveyors

    General question about the standard or regulations involving how a pull cord e-stop circuit is wired. Can a pull cord circuit be wired through a PLC for a stop command to be implemented, or does it have to be hard wired back to the contactor of the starter for the conveyor motor? Are both...
  4. ReliabilityTech

    Insane Motor Circuit

    Waross: The input voltage only drops to 563V. The 13.8kV side (primary of first transformer) doesn't budge. There is an SVC after the site's utility transformers that reacts to sags/spikes. I was following up to let the interested parties, including yourself, know that this is ongoing and that...
  5. ReliabilityTech

    Insane Motor Circuit

    UPDATE: There was monitoring equipment attached to this circuit recently and the secondary voltage of the auto transformer was (obviously) where the bottleneck was occurring. The output was ~3100V and was not generating enough torque to turn the motor's attached load. The auto transformer has...
  6. ReliabilityTech

    General HV Fuse Question

    Thank you very much! This is very confusing especially since the "250" portion is in bold and the "RC140" is smaller on the fuse's label. Might explain why we were seeing temperatures >110C!!! Our thermal imaging camera lens only goes to 110C. Thanks again for your explanation.
  7. ReliabilityTech

    General HV Fuse Question

    I have a fuse that apparently has two ratings. On the datasheet for the fuse on the SIBA site, it has a rated current of 140A. It was sold to my group as a 250A fuse. SIBA 3019614.250 The In = 250RC140A My understanding is that this is a 140A rated fuse with the 250A referring to the designation...
  8. ReliabilityTech

    Insane Motor Circuit

    Good points, gentlemen. Thank you very much with keeping up with this thread. Where the electrical contractor is currently since my initial post last week: A company projects representative/consultant newly appointed to this project has terminated any further testing by the contractor since...
  9. ReliabilityTech

    Insane Motor Circuit

    Thank you very much for your reply! I appreciate the feedback no matter which direction it is coming from. I've had a very difficult time finding any external references where a 600V source is used to drive a 4160V motor whether it's through an autotransformer or standard transformer. Stepping...
  10. ReliabilityTech

    Insane Motor Circuit

    Because I'm not an engineer, and I'm currently in heated discussions with an electrical engineer, I need some theoretical assistance with the following circuit. 13.8kV primary to 600V secondary, 600V secondary to 600V/4.16kV autotransformer to 4.16kV softstarter, softstarter to 4.16kV motor...
  11. ReliabilityTech

    SEL-751A Modeled in ETAP

    Good day all, With the available settings in ETAP in reference to the SEL-751A, how do I incorporate the fiber-optic arc-flash detector to lower the category of the busses that I am faulting. The only curves I can alter are the normal phase, neutral, ground, and negative sequence overcurrent...

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