Wiring different on new spindle, need help.

[terry1956]

Hi chaps. My last spindle died when a bearing went. I ordered what I hoped would be a direct replacement. But when it turned up the wiring is different. The spindle I had before had the wiring connector clipped onto the spindle. This new one as the wires inside a black box on the front. Inside the lid it states 330v, or 220v. There are three terminals and also an earth terminal. But I have know idea which of the three terminals to use. There are know instructions at all. I was hoping to keep using the original VFD to run the new spindle. The old spindle was 3.5kw, the new one is 4kw. Can anyone please help . Thanks

[Clive S]

Hi chaps. My last spindle died when a bearing went. I ordered what I hoped would be a direct replacement. But when it turned up the wiring is different. The spindle I had before had the wiring connector clipped onto the spindle. This new one as the wires inside a black box on the front. Inside the lid it states 330v, or 220v. There are three terminals and also an earth terminal. But I have know idea which of the three terminals to use. There are know instructions at all. I was hoping to keep using the original VFD to run the new spindle. The old spindle was 3.5kw, the new one is 4kw. Can anyone please help . Thanks

To be sure a picture of the connections would help plust a picture of the VFD wiring

[terry1956]

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[terry1956]

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[terry1956]

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[terry1956]

Hope these help, sorry I don’t have a very good camera

[Doddy]

Possibly a part number for the motor? the images are a little indistinct. Also part number of the VFD?

[terry1956]

The vfm is wired to the spindle, using terminals E,R,S. Inside the spindle cover is the following information. 220v, pin W2,U1. pin U2,V1. Pin V2,W1. And also. 330v. Pin W2 U1. pin U2,V1. pin V2,W1. None of which makes any sense to me at all.

[Doddy]

Can't advise at this stage without more info (see above) - it sounds as though you was wired for a single-phase motor and your new one is three phase, but I'm guessing an awful lot. Does the VFD have a R, S and T terminal? (it'd be good if it does and the new spindle is 3-phase)

[Clive S]

The vfm is wired to the spindle, using terminals E,R,S. Inside the spindle cover is the following information. 220v, pin W2,U1. pin U2,V1. Pin V2,W1. And also. 330v. Pin W2 U1. pin U2,V1. pin V2,W1. None of which makes any sense to me at all.

Can you take another pic of the black box without your hand holding it so that you can see the terminals

[terry1956]

Thanks for trying to help, there is no number on the motor, but this is the front plate. A few more pictures.27835

[terry1956]

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[terry1956]

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[Doddy]

Sorry, my bad before - the incoming supply is to R,S, and E=Earth. The output is the UVW terminals (wired Blue, Brown and Earth wire <naughty>), ah, so it was three phase and you're looking to wire the new spindle similarly?, looks do-able.

We could still do with what Clive asked for - a better image inside the terminal housing on the spindle. What you've described are six terminals - two for each winding, and three windings for a three-phase motor. The manner these have been described wires the windings in what's known as a delta configuration. Normally this is one of two types of configuration, the second being "star configuration", and is normally used for a "proper" three-phase 415VAC-across-phase supply. The delta configuration is more typical of a 220VAC three-phase supply much as you might expect from a simple VFD.

What's confusing me is that you've described the wiring identically for 220V and 330V operation. I suspect there may be other markings, perhaps subtle, on the terminal enclosure to describe better the difference between 220 and 330V operation.

[Doddy]

Right, I'd like someone else to check my working here - I've had to squint an awful lot at that last image. There should be 6 bolt heads with three plates attached. Those plates can be reconfigured according to star/delta configuration. You should reconfigure the plates to sit one across the U1 and W2 bolts. One across the U2, V1 bolts and one across the V2, W1 bolts. Three plates, sitting parallel with each other. Your U/V/W wiring goes one to each of these (e.g. U to U1, V to V1 and W to W1). If the motor spins the wrong way, reverse two phases.

The other configuration - star, for 380V (not 330V) is shown with the plates shorting the W2, V2 and U2 bolts. But you probably don't want this.

That's the wiring side of things - does your VFD support the 4KW spindle?, you may need to reprogram it with the new spindle characteristics.

[Doddy]

...and you need 4 core cable - to provide earth to the spindle.

[Doddy]

Something like this...

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[JAZZCNC]

Can you show us a picture of the actual spindle terminals.