Jet 1840 240 volt won’t run

[Paul Lajoie]

My 3 year old Jet 1840 240 volt decided it doesn’t want to run. Was turning working a puzzle box top so on /off a couple times nothing I haven’t done before. Then nothing. I have power, even reset power breaker just in case. Only lathe and dust collector on circuit never at same time. Dust collector still runs so rule out breaker. Not seeing codes on back of controller. Checked Estop fault does light up but goes out as soon as butting released. Unplugged and let sit a couple hrs still nothing. I heard other turners having to blow out start stop switch, but those were mini lathes. Full size have that problem? Hoping it’s something simple, anyone got a solution? Thanks for any ideas.


Paul

 

[John K Jordan]

If it's a Delta S1 VFD there should normally be, I think, "F 000" on the vfd display in the back when turned on. I've had to replace a VFD that went bad - bought an inexpensive generic one and programmed it. Doc Green has a good article on, not your model, but this type of lathe and VFD.

Maybe look at his PM Electrical article

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Doc Green's woodturning tips.

www.docgreenwoodturner.com

I had to clean out the dust on a Jet 1642 switch. Took it apart (don't drop and lose the tiny ball bearing), cleaned it out, reinstalled after wrapping the back with plastic wrap and tape so dust couldn't get in again.

JKJ

 

[Paul Lajoie]

If it's a Delta S1 VFD there should normally be, I think, "F 000" on the vfd display in the back when turned on. I've had to replace a VFD that went bad - bought an inexpensive generic one and programmed it. Doc Green has a good article on, not your model, but this type of lathe and VFD.

Maybe look at his PM Electrical article

Articles Index

Doc Green's woodturning tips.

www.docgreenwoodturner.com

I had to clean out the dust on a Jet 1642 switch. Took it apart (don't drop and lose the tiny ball bearing), cleaned it out, reinstalled after wrapping the back with plastic wrap and tape so dust couldn't get in again.

JKJ

Thanks John think I’ll be taking the switch out tomorrow. Wish me luck.

Paul

 

[Richard Coers]

Is there a potentiometer on that machine? Those are susceptible to failure when the the contact arcs a couple times and fails.

 

[John K Jordan]

If it's a Delta S1 VFD there should normally be, I think, "F 000" on the vfd display in the back when turned on.

I think the display on back of the VFD will be present if the lathe is simply plugged in, even if the lathe is not turned on. At least that's what I think I remember when I tried this yesterday on my PM. But my brain is aging and not always reliable....

 

[Paul Lajoie]

The vid has 3 lights, ready, run, and fault. Plugged in the ready lights up, when the Estop is pushed fault lights up then goes out when button is released. Assuming the run lights up when energized. Can I “jump” start it with out harming the VFD?

 

[John K Jordan]

The vid has 3 lights, ready, run, and fault. Plugged in the ready lights up, when the Estop is pushed fault lights up then goes out when button is released. Assuming the run lights up when energized. Can I “jump” start it with out harming the VFD?

I'd have to look closer at mine on the PM3520b. I don't remember what indicator lights do what when. I might be able to take a peak at mine tomorrow

I've taken several non-functional VFDs apart and the electronic complexity inside is impressive.

Don't know exactly what you mean by "jump" starting it but I'd be very cautious about applying any voltage anywhere without completely understanding how it's supposed to work and if that's different from how it's currently behaving. For debugging I'd probably first trace the control wiring and make a circuit diagram, then measure the voltages with a DVM when the various controls are operated and see if they make sense. The Delta S1's I'm familiar with use low voltage DC on the control circuits, either 5v or 10v. The speed circiot, I think is AC. The output to the motor is 3-plase.

All the wiring connections shoud be labeled and accessable once the VFD cover is removed.

I haven't had an "estop" button like that on any of my lathes - just mechanical ON/OFF switches and an emergency off toggle switch mounted in a magnetic box. Is the "estop" a spring-loaded switch? Should be easy to test with DVM once isolated by disconnecting

Doc Brown's article might help - the wiring colors are someimes differeent on different lathtes but the function should be the same.

Can examine frequencies of the phases, etc with an oscilloscope for debugging that part of the electronics. The voltages there can be hazardous.

I wish I lived around the block - this kind of debugging can be fun!

JKJ