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I have eight different kV motors that I need to run from the same source. I cannot change the topology to have different sources for each motor. Ideally something that simply turns the relays on one at a time for five minutes at a time would be fine. I need to ensure with a degree of certainty that:

  1. Two or more motors cannot be run at the same time
  2. Between switching motors there should be a small dead time.

I cannot use a cheap (/chinese) relay board controller but it needs to come from a reputable supplier. I have read alot about using two contactors to INTERLOCK a motor to go forward and reverse but cannot find a way to daisy chain them. However the word interlock is defined for two devices, so it might be that I am missing the correct terminology to find the component.

Does anyone know of any topologies, hierarchies or components that could resolve this for me?

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    \$\begingroup\$ What's a kV motor? \$\endgroup\$ – Marko Buršič Apr 6 at 19:03
  • \$\begingroup\$ A motor that requires a 1.5kV supply \$\endgroup\$ – JiPecki Apr 7 at 5:57
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First, I would use a proper industrial PLC (Programmable Logic Controller) from a reputable supplier, not a board-level device from any supplier of any pedigree.

Secondly, you can simply daisy-chain relay normally-closed contacts to create an additional hardware interlock.

schematic

simulate this circuit – Schematic created using CircuitLab

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Using industrial power contactors with add-on contacts, you can prevent to start more than one motor at once, this is fairly simple relay logics.

enter image description here

There are also pneumatic timers, for those contactors. They are expensive, but I have never seen anything more robust than those timers.

enter image description here

You should describe more in detail, what you need. Perhaps you will need also motor protection circuit, perhaps a small PLC like Siemens LOGO if you need a software interlock and timer, perhaps some kind of start/stop switch,...

schematic

simulate this circuit – Schematic created using CircuitLab

| improve this answer | |
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