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Delta 46-745 VFD Problem

C

craterdog

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Aug 21, 2007
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I recently purchased a Delta 46-745 16" lathe with a Baldor VFD at an "as is-where is" auction. When I plugged it in and turned it on, the green power light came on, the red fault light came on, the stop light was blinking and the motor would not work. I called the Delta tech line and they referred me to Baldor, saying they had no idea what the problem was and that the VFD is no longer available. I have tried to reach Baldor but have not been able to find a tech support number to talk to them. I was able to get the Baldor manual, model no. MN715P, but there's no info in the troubleshooting area that describes the conditions on my lathe. Does anyone have any suggestions as to how I can get this problem fixed?
Tim Carter
 
Larry,
Thank you for the link to the manual but it's not the right one. The manual is for the MN715 and mine is the MN715P, where I believe the "P" stands for potentiometer. Mine does not have a display to read the fault codes, only a set of lights that are supposed to blink in various sequences to tell you what the fault is. Thanks again.
Tim
 
Your local electric motor repair shop probably has someone familiar with VFD's. They might be able to help you.
 
I looked at the manual on the Baldor site and saw that the fault codes all refer to the fault light blinking a certain number of blinks to indicate various types of fault conditions. I suggest backing up and reading the manual from the beginning. Things to check include DIP switch settings, the positions of the six potentiometers, wires to the speed control if remotely located, wires to the motor, etc.

There may be a reset that would fix your problem.
 
Has anyone either had a Baldor VFD repaired or replaced for this lathe? The Baldor model is IN0694B03. Would appreciate any help.
 
The recommendation seems to be a WEG CFW100073SDZ This appears to fit the bill. I this what you installed Bill? Also with this inverter do you still have reverse?
 
If it were mine, I'd do some quick checking to try and fix the existing system.
If you can get at the wiring, then check the inputs to the VFD with a voltmeter.

I presume its 220 single phase input. From the manual you can determine which terminals that is. Your inputs should be fine but you can rule out any issues with plugs or master power switch, grounding etc.

Then check the outputs for all 3 legs of the 3 phase. I would disconnect the motor for this test.
You should see fairly similar voltages (about 210 - 230 volts) likely with one leg lower.

If any of these is very low, or non existent, then there's a VFD issue.

Check the manual and see if its possible to do a factory reset. That should clear any error codes. Then retest without motor.

If the VFD passes, then I would borrow a 3 phase motor, hook it up and do a test run. Its possible someone hooked up the motor on the wrong voltage, etc. On used equipment don't assume the previous owner had it set up correctly. Its fairly hard to burn out a 3 phase motor, but possible.

One issue is that VFDs don't like sitting around idle for long periods. i think it has to do with caps drying out. I've had ones sitting for years without issue though.

That VFD should be easily replaceable. I've been using the Delta brand, second hand, off the boat from China, via eBay. Cheap, good manuals, never had an issue. 1-3 hp converted should about $200 or less.

Hook up is easy. Just label the wires you took off and connect them back again. Its pretty easy. if you have a remote, its a bit more work, but most VFDs are very similar.

Hope that helps.
Olaf
 
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