Jet GH-1340T lathe info

[Randoo]

I just picked up a 1993 Jet GH-1340T lathe but I can't find any real information about it. I'm hoping someone can point me towards a manual or electrical schematic. I'm going to power it up with a VFD but still want to use the foot brake most of the time. I thinking I can set the VFD to coast to stop when the brake is applied so I don't fight or harm the VFD. Not sure if I still want to use the forward and reverse contactors to break the motor leads or just use the contactors as inputs to the VFD. Anyone powering their lathe with a VFD and still use the foot brake? How did you set it up?

Thanks,
Randy

 

[Randoo]

I traced out the wiring and drew up a schematic. Thinking I will use one of the main contactors to power up the VFD when I turn on the control selector switch. Have a basic idea of controls for the drive but won't be sure until the drive arrives so I can check out the manual. I still am looking for a manual. Any 1340 lathes that are close to this that has a manual I can get?

Thanks,
Randy

 

[ignator]

You DO NOT want any contactor between the VFD and motor. It's the quickest way to blow up a VFD. So never put a switch contact between the VFD and motor. Let the VFD control it.
I have a similar lathe that has 3phase main motor and 3phase coolant pump motor. I did rewire the lathe to use the main power switch to power the VFD input. And a FWD and REV contact from each of the original motor contact switches to the VFD for digital input control using the +24VDC discrete power of the VFD.
And yes, you can set the VFD up to coast to stop.
This keeps the interlock parts of your lathe motor control, so if the FWD/REV control lever is left in the on position, it prevents the lathe from running on power up. So you don't touch any part of that interlock wiring. Just the output contacts of the FWD/REV contactors in the control box. And these are isolated from any input power of the AC mains during operation, as you've disconnected them to be reused to control the input discretes of the VFD.

 

[ignator]

As for the coolant pump, I bought a super cheap VFD from eBay, and power just that from the front panel switch, But maybe your coolant pump is not 3phase. Mine was, so a $40 VFD was the easy solution, as it's a less then 1/10thHP motor.