Jet 1642 stalling

[RGrady]

I bought a Jet1642EVS with the 1-1/2 hp motor about 3 months ago. As time goes on it seems to be getting very easy to stall the motor even on the high torque setting. I check to see if it was the belt slipping but it is stopping the motor. Has anyone else experienced this problem?
Thanks

 

[Bill Boehme]

I bought a Jet1642EVS with the 1-1/2 hp motor about 3 months ago. As time goes on it seems to be getting very easy to stall the motor even on the high torque setting. I check to see if it was the belt slipping but it is stopping the motor. Has anyone else experienced this problem?

I hope that it is not the case, but it is possible that the motor could be failing due to arcing between adjacent wires in the windings. Variable Frequency Drives are tough on a motor due to the very high voltages transients generated when the high frequency pulsed input voltages signals from the VFD are connected to the motor which has a highly inductive load reactance. Keep your fingers crossed and don't get overly alarmed by my speculation. Without actually testing the motor, you can't tell for sure.

If you have some way to quantify the torque, it would be worthwhile to measure it at the same speed periodically to verify that it really is degrading or you are just getting stronger.

Sometimes load reactors are inserted between the VFD and the motor to attenuate the high voltage transients. It is also common to use line reactors between the VFD and power source, especially if the run back to the transformer is long or has a high impedance to ground. My observation of a few different lathes with VFD is that they don't use either line or load reactors. In fact, some of the lower cost drives won't even work properly if reactors are installed. As a general rule for industrial controllers, both load and line reactors are installed.

Bill

 

[Jack Savona]

What about a call to JET tech dept.? May get some good info from them.

Jack

 

[RGrady]

I have e-mailed Jets tech dept but they are closed till Monday. Was just wondering if anyone else had this porblem and how it was solved.
And just when I was thinking that woodturing is not rocket science I look at Bill's biography and see his occupation as "ex rocket scientist". Bill were you an Electrical eng. in the construction industry? I have been a Mechanical const. supt. in D/FW for the last 25 years. Maybe we chewed some of the same ground. 🙂
Oh by the way you shot that response about 5' over my head. heh heh

 

[Bill Boehme]

And just when I was thinking that woodturing is not rocket science I look at Bill's biography and see his occupation as "ex rocket scientist". Bill were you an Electrical eng. in the construction industry? I have been a Mechanical const. supt. in D/FW for the last 25 years. Maybe we chewed some of the same ground. 🙂

Sorry about getting too technical -- I get carried away sometimes (they're coming to take me away ....).

I worked as a control system designer / analyist (autopilots, guidance systems, fire control systems, etc.) on various types of aerospace vehicles. Then I went over to the dark side of the force and I .......
.......I hate to say it ........ I, uh, well I didn't mean to do it, really .....
OK, I will say it ----- I became a manager. OK, my dark past has been exposed and now I feel better.

Bill

 

[hcbph]

Is there a chance you either have low voltage or problems in the circuit/service? I've seen equipment slow down due to low voltage before. Also if you happen to have aluminum wiring, I'd get an electrician in to check out your service. If it's copper, I'd check to insure all the connections from the circuit panel through the outlet are tight. If it's in the lathe, that's a little out of my area and appears to be already covered.

Good luck. Let us know what happens

Paul

 

[RGrady]

Lat night I unplugged the lathe for about 10 minutes to let the capacitor discharge and re-boot the VFD. It seems to be performing better. Dont know if this was the problem or maybe I was getting a low voltage situation. I live out in the sticks and it was a stormy day so that is a possibilty. I will talk to WMH Monday and set-up atime to take it to a service center and have it checked out just in case.
Bill, I wish you had not revealed your dark secret of being a manager. Managers are skeery people. I am now duly skeered, very very skeered. 😀

 

[MichaelMouse]

Lat night I unplugged the lathe for about 10 minutes to let the capacitor discharge and re-boot the VFD. It seems to be performing better. Dont know if this was the problem or maybe I was getting a low voltage situation. I live out in the sticks and it was a stormy day so that is a possibilty. I will talk to WMH Monday and set-up atime to take it to a service center and have it checked out just in case.
Bill, I wish you had not revealed your dark secret of being a manager. Managers are skeery people. I am now duly skeered, very very skeered. 😀

When the voltage drops, my lights dim, so that's what I'd use as an indicator. We get a lot of "touches" on the lines in our area, depending on the strength and direction of the wind. We've had some pretty good fires from time to time, and more than one firefighter has mentioned sending a bill to the company for brushing their lines.

Managers aren't bad until they cease to be task managers and become people managers. Remember one of my instructors, a Marine Col. who said "you can manage the daylights out of an inventory of pliers, but you have to lead men." When they gave me a desk to fly, happily, they also gave me a good NCOIC, and between us we tried to stay out front of the gang we worked with. Which is where you must be if you're leading.

 

[RGrady]

Just got off the phone with Bobby in WMH tool groups tech dept. After doing a few checks for him he is sending me a new motor. 😀
It is nice to do business with a company that conducts itself ina professional manner.