VFD terminals , how to wire

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VFD terminals , how to wire

This topic has 7 replies, 6 voices, and was last updated 14 August 2022 at 15:43 by DiodeDick.

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13 August 2022 at 17:00 #609456
Michael Callaghan
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@michaelcallaghan68621
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.
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13 August 2022 at 17:00 #32277
Michael Callaghan
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@michaelcallaghan68621
13 August 2022 at 17:12 #609458
John Rudd
Participant
@johnrudd16576
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
13 August 2022 at 17:34 #609463
Harry Wilkes
Participant
@harrywilkes58467
Looks like for single phase L1 L2 but check for yourself link

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

H
14 August 2022 at 12:50 #609536
Pete Rimmer
Participant
@peterimmer30576
Posted by Michael Callaghan on 13/08/2022 17:00:40:

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.

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.
14 August 2022 at 15:20 #609554
SillyOldDuffer
Moderator
@sillyoldduffer
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
14 August 2022 at 15:29 #609556
Michael Callaghan
Participant
@michaelcallaghan68621
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
14 August 2022 at 15:43 #609560
DiodeDick
Participant
@diodedick
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
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