UPS Upgrade
UPS Upgrade
(OP)
Im new here in the forum, and i've learned a lot of things by simply reading all posted threads. So, Thank you.
Can you guys help me on this. We need to upgrade our data center 30KVA UPS to 30KVA SMART UPS VT. this model include an automatic maintenance bypass panel. i attached here the existing electrical plan together with our proposed plan. my question is,
1. can we connect the existing 33KVA AVR before the new 30KVA UPS at the same 100AT lines?
2. Does the AVR consume as much current as the UPS?
3. Will there be any problem if an AVR is connected before the UPS? I mean, the redundancy on voltage regulation? We want to place the AVR before the UPS mainly because, at bypass mode (normal line) we still want the input supply to be regulated.
Any help will be much appreciated.
Can you guys help me on this. We need to upgrade our data center 30KVA UPS to 30KVA SMART UPS VT. this model include an automatic maintenance bypass panel. i attached here the existing electrical plan together with our proposed plan. my question is,
1. can we connect the existing 33KVA AVR before the new 30KVA UPS at the same 100AT lines?
2. Does the AVR consume as much current as the UPS?
3. Will there be any problem if an AVR is connected before the UPS? I mean, the redundancy on voltage regulation? We want to place the AVR before the UPS mainly because, at bypass mode (normal line) we still want the input supply to be regulated.
Any help will be much appreciated.






RE: UPS Upgrade
Rafiq Bulsara
http://www.srengineersct.com
RE: UPS Upgrade
If you intend to regulate the mains to the UPS then the regulator appears to be marginally sized if you're expecting it to supply the UPS, plus its losses, and also the power required for recharging the battery following a power outage.
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If we learn from our mistakes I'm getting a great education!
RE: UPS Upgrade
RE: UPS Upgrade
The 100A breaker is more than enough for 30kVA of load. Check with the UPS and AVR manufacturers for recommended breaker size.
If you must comply with the NEC, the 100A main breaker in your panel is too large. It should be 90A maximum for protection of the 45kVA transformer.
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: UPS Upgrade
Bill
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"Why not the best?"
Jimmy Carter
RE: UPS Upgrade
RE: UPS Upgrade
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If we learn from our mistakes I'm getting a great education!
RE: UPS Upgrade
Your new system may have the ability to be wired like this but you will have to check with APC.
The AVR is on the bypass line to protect the load from any fluctuations while the system is running in bypass either for maintenance or due to an inverter failure.
There is no real benefit from putting an AVR on the rectifier input supply and is only adding something to this supply that may fail.
UPS engineer http://www.calibrepower.co.uk