Homemade auxiliary power for elevator

[Manowar1985]

Hi everyone. I am new here and I would like to ask for your help about my small elevator.
So when the power is out I want the system to automatically switch to the power auxiliary system.So the only thing I came up with is the attached schematic but I fear the interference of the 220v of the ac outlet with the 220v of the inverter output.If you have any suggestions it would be appreciated. Thank you

 

[itsmoked]

You cannot do that for so many reasons...

Look up "automatic transfer switch".

Learn about the current needed at 12V to run your inverter.

Learn what "contactors" do.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[zeusfaber]

Everything Keith said - with a few questions to get you thinking:

You've gone to significant lengths to provide a 12V dc supply to operate a relay that's switching 12V dc. Did you know that you can get relays where the coil operates with a different sort of supply to the current it's switching? You can get relays with coils that operate off 230V ac - and most contactors use a mains voltage coil.

How happy are you with a system where the inverter backfeeds the supply line (and all its attached loads all the way back to the thing that tripped to cause the power cut)?

Get a highlighter and on your diagram mark the Live that comes out the inverter, trace it up to the transformer, across the rectifier and into the relay. Why is this energy path significant?

What does the spec sheet for your inverter have to say about having an external ac power source parallelled with the output? Does this change depending on whether the dc input is energised? How did Keith acquire his nickname?

You haven't drawn the motor controls. Did you just leave them out to simplify the sketch (fair enough), or are they in the power lines upstream of the drawing?

Does it matter if the elevator loses power? If it does matter, what are you going to do to make sure that the user does the right thing with the time the backup buys them, rather than getting caught out when the battery is exhausted?

A.

 

[LionelHutz]

RTFM. Connecting AC to the output of the inverter will blow it up. It likely warns against that exact connection in the manual.

Even if it can provide the power required to run the motor, the inverter likely can't provide the power required to start the motor.

 

[IRstuff]

see:

https://www.elevators.com/wp-content/uploads/documents/Visi-48/Visi 48 - Specifications 20120301.pdf

this one requires 30A service at 220V; that's 6.6 kVA; your drawing shows a total capacity of 780AH, which means you can run the elevation for maybe 12 minutes total time.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

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[itsmoked]

Yes TooldToCare it works!
Now can you please self delete your hijack post?

Keith Cress
kcress -

http://www.flaminsystems.com