VFD terminals , how to wire

Hi, it’s been years since I wired a VFD, and I have forgotten the little I knew to start with. My problem is that the input side of the Delta VFD-EL is marked R/L1,S/L2,T/L3. The manual is full of drawings and safety this and that but nothing has clear has live, earth and neutral. So can anyone please let me which of these terminals are indeed live and earth and neutral. Thanks.

As with many vfd u it’s on the market, they can be fed from either single or multi phase supplies.

As per the manual linked to, not necessarily your vfd specifically, as I couldn’t find your model number…but on page 3-6 it states the main input for a single phase supply  can be connected to any of the input terminals…,that is: Live to L1 and Neutral to L2 , or Live to L2 and Neutral to L3 or even Live to L1 and Neutral to L3….

Ensure the incoming earth conductor is connected appropriately to the Earth terminal.

https://gappautomation.azurewebsites.net/download/file/127/242/deltaia-mdsvfd-l2umen20020531pdf

Edited By John Rudd on 13/08/2022 17:16:29

Looks like for single phase L1 L2 but check for yourself link

http://www.realimpeks.co.rs/download/delta_vfd_el.pdf

H

For single phase input L1 is live and L2 is neutral, Earth goes to the earth terminal or point on the chassis marked as such and L3 is left not connected. It may have a link plate from L2 if it does, leave that alone.

Does anyone know where the various letter codes come from and if there are more?

R Y B refers to the Red Yellow Blue wiring colour code

L1, L2, L3 I think is the current European standard

H1,H2,H2 and T1,T2,T3 are a mystery to me

ABC and UVW are arbitrary sequences I think, but I vaguely remember RST is from a German standard and the letters are short for the words describing the 0°, 120° and 240° phase angles.

So much for standardisation!!!

Dave

Thanks chaps, sorted now. What a pain it’s all become. You just get in the hang of L,N,E and they change it to meaningless nonsense

My Mitsubishi VFD uses L1 and N for the single phase input and U V W for the output to the motor.

I think that the U V W comes from a German standard (VDE?) but not sure.

in the good old days, the British Electricity Boards had their own defined standards. (So did the post office)

BEBS12 covered colour codes for multi core cables and PO44 covered the "grass hopper" fuses used for 50V dc control circuits.

funny how some things still stick, after 40-odd years.

Dick