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Possible candidate for 3-phase for my lathe?

Right. I forgot it said momentary switches. I may have momentary switches now because there is at least one contactor in the existing electrical box now.

My pdf is truncated. I'll have to try it again.

I confess that I find it hard to believe that the fwd/rev switches are momentary. If that's the norm, I'm not aware of it.

Or is that perhaps an optional configuration?
 
My pdf is truncated. I'll have to try it again.

I confess that I find it hard to believe that the fwd/rev switches are momentary. If that's the norm, I'm not aware of it.

Or is that perhaps an optional configuration?
The VFD can also have the two momentary switches act as JOG buttons. While held down the motor turns.
 
Jog is not a huge deal to me though I can see the value.
My needs are:
A start/stop switch
Forward switch
Reverse switch

Jog is entirely optional.
 
This is what I have now.
Left is for coolant pump which I don't have.
Indicator light
Reverse rotation
Stop switch
Forward rotation
PXL_20250511_225956547.MP.jpg
 
Oh that's the start/stop to me.

Well......

IMHO, it's an EStop. The EStop should use a brake resistor and it should stop NOW. Almost to the point of breaking something. Basically max torque but in reverse.

The regular stop should use a programmed decelleration that is similar to the acceleration rate when it is turned on. Both are reasonably fast but not emergency class. I set these rates based on smoothness. This is important because I sometimes go from full forward to full reverse.
 
Well......

IMHO, it's an EStop. The EStop should use a brake resistor and it should stop NOW. Almost to the point of breaking something. Basically max torque but in reverse.

The regular stop should use a programmed decelleration that is similar to the acceleration rate when it is turned on. Both are reasonably fast but not emergency class. I set these rates based on smoothness. This is important because I sometimes go from full forward to full reverse.
I can add a brake resistor.
With a threaded spindle nose I can't do a hard stop as I risk spinning the chuck off.
 
Last edited:
I can add a brake resistor

Yes, I see it there.

I've downloaded the manual twice now. It seems to be incomplete. I cannot find page 3-47. In fact the last half of section 3 is missing for me.

I REALLY want to see how this momentary switch stuff works.
 
I can add a brake resistor.
With a threaded spindle nose I can't do a hard stop as I risk spinning the chuck off.

Nice edit. I agree. A threaded spindle adds its own requirements.

This is probably one of the many advantages of a VFD. You can make it what it needs to be.

If you always use a torque wrench to install the chuck, you could, set the decell rate to be safely below that. Better would be to actually measure the torque to loosen the chuck and program the VFD decell to stay below that.
 
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