Building management system

T

Therealcrt

Senior Member
Location
Kansas City
Occupation
Electrician
Got called on a service call The customer has a building management system panel, as of right now there’s a 120 V circuit running to the panel connected to a terminal block input and the wire is on the output of the terminal block are capped off instead of being landed on the 120 to 24 V transformer. Instead, they have a battery back up plugged into a receptacle, and the output of it is ran to the panel and landed on the transformer input terminal essentially providing normal power to the panel instead of the feed from the electrical panel. It’s done this way so if the building loses power Since the battery back up is connected to the building management system panel, it won’t lose power.question, obviously how do I provide normal power from the electrical panel to the building management system panel but also still intertwine the battery back up to the panel in case of the power outage that will stay on do I need a special set of contacts to route the circuit through as well as the output of the battery back up and then feed the building management system panel from that?
 
What is feeding the battery right now?

What type of battery is it? is it a 120V APC unit, similar to that of a computer back up battery?
 
I think what you're asking is "How do I do this so the panel has continuous power, even if the battery backup system must be removed?" If so, a wrap-around bypass like Vertiv's MicroPOD is the answer.
 
ModbusMan said:
I think what you're asking is "How do I do this so the panel has continuous power, even if the battery backup system must be removed?" If so, a wrap-around bypass like Vertiv's MicroPOD is the answer.
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No the battery backup still needs to be involved Just not as the main power feed to the panel
 
Are you just concerned that the panel is running off of whatever receptacle the battery backup is plugged into instead of the intended circuit run to the panel? If so, why not just install a receptacle on the panel circuit and keep the backup wired in as it is now? I don't know how big the management panel is. If you have to put the receptacle and battery outside of it, maybe make it a simplex receptacle and add some signage of "Do Not Unplug".
 
Are you saying that the BMS panel does not have built in battery back-up?
 
gadfly56 said:
Are you saying that the BMS panel does not have built in battery back-up?
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Wouldn't surprise me... Niagara JACE units of the 200/300/600 series had a small NiCd pack as an option, but the newer 8000s didn't. Automated Logic had a spot to put a 123 cell on their LGR and ME boards, but I haven't run into any of their current gen yet (though I'll be getting some later this year :) ) I can't remember seeing any sort of battery on the Alerton BCM or ACM modules I have, but their system makes me grumpy for other reasons even if they do have something built-in.
 
Electromatic said:
Are you just concerned that the panel is running off of whatever receptacle the battery backup is plugged into instead of the intended circuit run to the panel? If so, why not just install a receptacle on the panel circuit and keep the backup wired in as it is now? I don't know how big the management panel is. If you have to put the receptacle and battery outside of it, maybe make it a simplex receptacle and add some signage of "Do Not Unplug".
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No, the problem is there’s only one location to land incoming power on the BMS panel at one point. It was the dedicated 120 V circuit from the panel now it’s the output side of the battery back up. That’s providing the constant power, but it will also provide the backup power obviously
 
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