It's been a number of years since I've installed a UPS, and I know the answer to the question might vary with system type, but, are UPS systems genrally SDS systems. I have one with no information. Secondary voltage readings (hot to grounding) make me thik it is not a SDS.
Ups
- Thread starter augie47
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- Massachusetts
It varies as you guessed, I look at the wiring diagram for a factory neutral ground bond or I provide it. As I mentioned in another thread 99% of the time the job prints tell me what to do. I have only hooked up a couple of UPSs 'on my own'.
brian john
Senior Member
- Location
- Kilmarnock, Va
- Occupation
- Retired after 52 years in the trade.
What is the input and out voltage.
Is there a 4-wire bypass. Neutral from the line source connected to the load.
In my expierence asking the UPS techs will do you no good as they are totally clueless and will tell you to ground it no matter what.
Is there a 4-wire bypass. Neutral from the line source connected to the load.
In my expierence asking the UPS techs will do you no good as they are totally clueless and will tell you to ground it no matter what.
dbuckley
Senior Member
- Location
- Canterbury, New Zealand
The question must be "why are you interested?"
In terms of installing a ground bond, most UPSs dont do that as they have a bypass as noted above. However, a UPS with input transformers and no wrap-around bypass is a SDS, and then you get to bond N/G at the UPS output, but these UPS systems are relatively rare.
In terms of installing a ground bond, most UPSs dont do that as they have a bypass as noted above. However, a UPS with input transformers and no wrap-around bypass is a SDS, and then you get to bond N/G at the UPS output, but these UPS systems are relatively rare.
brian john
Senior Member
- Location
- Kilmarnock, Va
- Occupation
- Retired after 52 years in the trade.
Was hired to check a UPS that had been installed another contractor. This guy installed an off the shelf transformer for the wrap around bypass. BIG NO NO, the UPS output did not match the phase shift of the off the shelf transformer. The manufacutre's bypass transformer was 4 times the price of the off the shelf.
dbuckley
Senior Member
- Location
- Canterbury, New Zealand
The only question is why they called you in. One wonders if they had a smoke release incident...
K8MHZ
Senior Member
- Occupation
- Electrician
Small UPS
Small UPS
I assume you are talking about larger UPS devices than I have at my home. We have 6 or 7 or 8 of them.....I lost count. None of them are wired as SDS, just plug in back ups for computers, radios and cordless phones.
When not using the battery back up, they just pass the AC mains power to the powered devices. When we lose power a relay supplies power from the 12 VDC gel cell through an inverter. Very fast switching, too.
Is there something I am doing wrong or should know about my set up here?
Small UPS
I assume you are talking about larger UPS devices than I have at my home. We have 6 or 7 or 8 of them.....I lost count. None of them are wired as SDS, just plug in back ups for computers, radios and cordless phones.
When not using the battery back up, they just pass the AC mains power to the powered devices. When we lose power a relay supplies power from the 12 VDC gel cell through an inverter. Very fast switching, too.
Is there something I am doing wrong or should know about my set up here?
dbuckley
Senior Member
- Location
- Canterbury, New Zealand
No, you've got a typical "toy" UPS setup. purchase, plug in, forget. If you had 6 or 7 or 8 larger UPSs then you would need to have a huge house and still have nowhere to sleep other than on top of battery racks.
larger UPSs need a tad more planning than just pluggin' them in
larger UPSs need a tad more planning than just pluggin' them in
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