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Jet 1640 Inverter Fault -- Error Message "Aerr"

David Muehlbauer

David Muehlbauer

Joined
Feb 25, 2020
Messages
26
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9
Location
Mesa, AZ
I am posting this mostly as information, because when it happened to me I couldn't find any answers in the Manual or in any Forum posting.

I was turning a segmented bowl and had a catch on the inside and the motor stopped. The digital display read 'Aerr' (at least that's my best guess what it was saying). Turning the lathe off and on had no effect. Unplugging and re-plugging (re-booting) had no immediate effect. The inverter box on the back had the 'Fault' light illuminated. I spent some time searching the Manual and a couple of online forums and found no answers.

I unplugged the lathe for a while (maybe 10 minutes), and when I plugged it back in the digital display returned to zero and everything is working OK. I'd be curious if anyone knows what the stupid error message was or meant. but I guess if it happens again I'll know what to do.
 
I always blame it on earthquake.
 
David Muehlbauer said:
I am posting this mostly as information, because when it happened to me I couldn't find any answers in the Manual or in any Forum posting.

I was turning a segmented bowl and had a catch on the inside and the motor stopped. The digital display read 'Aerr' (at least that's my best guess what it was saying). Turning the lathe off and on had no effect. Unplugging and re-plugging (re-booting) had no immediate effect. The inverter box on the back had the 'Fault' light illuminated. I spent some time searching the Manual and a couple of online forums and found no answers.

I unplugged the lathe for a while (maybe 10 minutes), and when I plugged it back in the digital display returned to zero and everything is working OK. I'd be curious if anyone knows what the stupid error message was or meant. but I guess if it happens again I'll know what to do.
Click to expand...
I got that AErr code on my 1840. After lengthy time to get response from Jet tech I had no solution in sight. Troubleshooting on my own I found a very fine accumulation of dust on the spindle near the sensor. This is behind the control panel and not easily accessed without removing that front cover. I wiped away the dust, made sure the sensor light was clean and plugged in the lathe. The error code blinked on again and then cleared to the familiar speed reading. Problem solved. Lathe works great again.
 
Ben Simmons said:
I got that AErr code on my 1840. After lengthy time to get response from Jet tech I had no solution in sight. Troubleshooting on my own I found a very fine accumulation of dust on the spindle near the sensor. This is behind the control panel and not easily accessed without removing that front cover. I wiped away the dust, made sure the sensor light was clean and plugged in the lathe. The error code blinked on again and then cleared to the familiar speed reading. Problem solved. Lathe works great again.
Click to expand...
That sensor is only there to read the speed of the spindle and that signal just goes to the speed indicator without any connection to the VFD.
Look at the VDF to see if there is a model number then go to DELTA's web page and look for a manual for that model that should have a list of fault codes.
 
Don Wattenhofer said:
That sensor is only there to read the speed of the spindle and that signal just goes to the speed indicator without any connection to the VFD.
Look at the VDF to see if there is a model number then go to DELTA's web page and look for a manual for that model that should have a list of fault codes.
Click to expand...
Worked with the Jet tech at length. He said the code AErr indicated a fault in the remote shutdown switch. (Not covered by 5 year warranty but available for purchase for $100 and change.) I replaced that item and it made no difference. Jet tech said only other recourse to troubleshoot was an electronic box sold by delta to check the system. Jet doesn’t sell them. Neither does Delta. I was treated very rudely by customer service at Delta when I requested info. I ordered the part on eBay but have not yet received. In meantime I started my cleaning project and suddenly the lathe that wouldn’t work for two months works just fine.
 
Don Wattenhofer said:
That sounds like total BS
Click to expand...
Yup, very often is with untrained tech support folks reading from a script. In my past life as a small engine tech and business owner, I could tell you stories about folks that called the FACTORY for tech support, and then brought their machine in and tried to tell me how to fix it.. EVERY SINGLE TIME, the factory tech support was wrong. (and a couple of those customers wasted more of my time trying to argue the factory was right than it took me to fix the machine in front of them to show the factory was WRONG) Leaves me very leery of ANY factory tech support lines...
 
Don Wattenhofer said:
That sensor is only there to read the speed of the spindle and that signal just goes to the speed indicator without any connection to the VFD.
Look at the VDF to see if there is a model number then go to DELTA's web page and look for a manual for that model that should have a list of fault codes.
Click to expand...
Yes. Delta fault code for the series e inverters says AErr means analog signal error. Solution:check wiring of ACI.
 
Ben Simmons said:
Yes. Delta fault code for the series e inverters says AErr means analog signal error. Solution:check wiring of ACI.
Click to expand...
Analog signal error relates to the speed setting dial or potentiometer, which would and should result in a fault code since the VFD would not know what speed to run at. The cost of $100.00 for a $5.00 potentiometer seams a little excessive, to bad Radio Shack is not around any more you could probably have gotten a replacement pot.
 
So, other people seem to experience this AErr code and lathe shutdowns. The problem seems to come and go on some machines. Mine just shut down again after three days of working great. Any speculation as to what the specific problem might be and how to address or ask for repair solutions?
 
Ben Simmons said:
So, other people seem to experience this AErr code and lathe shutdowns. The problem seems to come and go on some machines. Mine just shut down again after three days of working great. Any speculation as to what the specific problem might be and how to address or ask for repair solutions?
Click to expand...
Yes because the code means "analog signal error" and the analog signal is derived from a potentiometer which is a variable resistor that has a sliding contact.
The 2 ends of the resistor are connected to a DC voltage of probably 10 VDC and the slider provides the analog voltage speed setting: example set to 1 on the dial = 1 volt or 10% speed, set to 5 = 5 volt or 50% speed and set to10 = 10 volt to 100% speed. The slider can fail to make contact due to wear or dust and that can be intermittent especially on a low quality potentiometer.
 
I'm no expert, but I think faults can be stored for a short time unplugged, because the capacitors will hold a charge for a while.
 
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