Saw tooth UPS output
Saw tooth UPS output
(OP)
I have a colleague who is working on a three phase UPS (MGE Comet). He attached his scope to the output and he is getting 480VAC phase to phase and a perfect sine wave which is as expected. He is reporting that when he goes from phase to neutral he gets a 277V saw-tooth. I do not have any pictures from his scope to post yet. This makes no sense to me as a PWM Inverter produces a PWM square wave which is then filtered to create a sine wave. If the sine wave is there for phase to phase then the PWM section of the UPS is working correctly. Any ideas?????
UPS Service Manager http://www.nolanpower.com





RE: Saw tooth UPS output
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Saw tooth UPS output
RE: Saw tooth UPS output
You have just confirmed that I am definately going senile! I just checked my threads and I did already post this problem last year. Everything blends into a blurr after a week or so!!!!!!
UPS Service Manager http://www.nolanpower.com
RE: Saw tooth UPS output
RE: Saw tooth UPS output
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
RE: Saw tooth UPS output
So, it is probably third tone injection this time also. No need to worry, I would say.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Saw tooth UPS output
Gunnar: I was referring to L-GND as the output of this UPS should have the neutral grounded.
UPS Service Manager http://www.nolanpower.com
RE: Saw tooth UPS output
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
RE: Saw tooth UPS output
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Saw tooth UPS output
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
RE: Saw tooth UPS output
That is obvious, isn't it?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Saw tooth UPS output
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
RE: Saw tooth UPS output
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.