ATS 277/480V to 120/208V

[GnomeDaddy]

The situation is at my facility they are asking me to take a ATS that was used on a building and use it on another. My administrator hasn't responded to me but my main question is the current location it was used at was 277/480 3 phase. The new location is 120/208 3 phase. Can I utilize that ATS on the diffrent voltage? I haven't found anything saying no. But I am second guessing my knowledge on this.

 

[ptonsparky]

Other than the pickup and drop out voltage are worlds apart, the contacts will handle the lower voltage.
Probably not worth the effort unless you can replace the entire logic control with the proper voltage.

 

[charlie b]

Well, perhaps yes, but no anyway.

Voltage ratings are based on the component's insulation system's ability to prevent leakage current from the current-carrying metal to the outside world. Since the ATS can handle 480 volts without leakage current, it should easily handle 208 volts.

My concern is the method that the ATS uses to detect a loss of voltage on the normal side. Would it not transfer when it sees only 208 volts available?

 

[charlie b]

I see Tom beat me to the draw with essentially the same response.

 

[GnomeDaddy]

Well, perhaps yes, but no anyway.

Voltage ratings are based on the component's insulation system's ability to prevent leakage current from the current-carrying metal to the outside world. Since the ATS can handle 480 volts without leakage current, it should easily handle 208 volts.

My concern is the method that the ATS uses to detect a loss of voltage on the normal side. Would it not transfer when it sees only 208 volts available?

I appreciate this, as I was looking at it I am able to adjust it. I am looking code wise, an the fact it is essentially using old equipment.

 

[ptonsparky]

You are able to select the voltage range? Set up a test and try it out. You don't have to test with a load to make it cycle .

We aren't there to see the condition of it.

I'm old and most of me still works.

 

[hillbilly1]

Some can be changed by only replacing the transformer pack (Kohler), not sure if the pack has multiple taps, don’t know about others.

 

[Seven-Delta-FortyOne]

Brand and model of ATS is going to matter a bunch…..

 

[Birken Vogt]

You will probably need to change the actuator coil as well. If it uses 480 volts to operate now. Often they have a different coil for 208 than 240 even. Off the cuff it is probably not worth it. Is this ATS very large and/or special?

 

[electrofelon]

It really depends on the ATS. I installed a 600 amp Thompson a couple years ago, you could change the voltage on it. There's usually nothing wrong with used equipment, and no code prohibition of it. I use used equipment frequently.

 

[hillbilly1]

Seems like on the last few ASCO’s I put in, you could select the voltage rotation from the programming menu.

 

[Birken Vogt]

You are still going to have to change hard part(s) that are voltage specific.

 

[hillbilly1]

You are still going to have to change hard part(s) that are voltage specific.

Not necessarily, the older Kohlers used step down transformers for the control solenoids and electronics. Residential grade transferswitches though, usually are line voltage on the solenoids or actuators. The transformer would be the only part changed. Or may be multi tap.