VFD for Other Than Motor Load?
VFD for Other Than Motor Load?
(OP)
In V/Hz mode with a transformer coupled load, can say a bank of resistive heaters be fed? If so, what type of load imbalance could it handle?
The VFD is "free" and a new SCR controller will cost as much, or more than a simple VFD.
The VFD is "free" and a new SCR controller will cost as much, or more than a simple VFD.





RE: VFD for Other Than Motor Load?
Also, set the drive for constant volts per hertz so the speed input translates directly into voltage change which translates by voltage squared into heat.
RE: VFD for Other Than Motor Load?
Imbalance can be as high as 35% before heater probe replacement can be scheduled.
RE: VFD for Other Than Motor Load?
RE: VFD for Other Than Motor Load?
RE: VFD for Other Than Motor Load?
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Sometimes I only open my mouth to swap feet...
RE: VFD for Other Than Motor Load?
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: VFD for Other Than Motor Load?
It is also about other things, but the risk of heating the transformer core is stressed. I will do some measurements on a small drive and a small transformer to find out how severe the problem is.
It may take a while before I can do that. Will probably have results beginning of next week. Can you wait that long?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: VFD for Other Than Motor Load?
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: VFD for Other Than Motor Load?
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: VFD for Other Than Motor Load?
RE: VFD for Other Than Motor Load?
Hmm... Why didn't I think of that?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: VFD for Other Than Motor Load?
Of course this was all a "dig" to Scotty but I doubt he's even noticed.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: VFD for Other Than Motor Load?
I will update after Friday's testing.
I will also be sure to select the null option for the potential enhancement variant ;).
RE: VFD for Other Than Motor Load?
Thanks for the feedback.
We await your Friday report!
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: VFD for Other Than Motor Load?
After all, the transformer has some R in its windings. And it doesn't hurt compensating for it. BUT NOT MUCH!!!
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: VFD for Other Than Motor Load?
Glad you got sorted out Laplacian. Remember to disable the voltage boost!
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Sometimes I only open my mouth to swap feet...
RE: VFD for Other Than Motor Load?
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: VFD for Other Than Motor Load?
What voltages are you talking about from VFD-transformer?
Also, when you talk about output phase imbalance, do you really want to disable the output phase loss detection in the VFD, would it not be preferable to keep it in?
RE: VFD for Other Than Motor Load?