Anomalous Behavior of Beagle Bone Green on Acorn Board with separate power supplies

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martyscncgarage
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Re: Anomalous Behavior of Beagle Bone Green on Acorn Board with separate power supplies

Post by martyscncgarage » Mon Feb 05, 2018 3:16 pm

andyolney wrote:
Mon Feb 05, 2018 2:47 pm
Marty-

Ouch, wrong again! Somehow I got the diode direction wrong in my head in the Acorn output schematic.

The vfd does indeed have a positive voltage (about 23v) at terminals 4 and 5 when I disconnected from the acorn.

On the other hand, the acorn seems to control it fine: CW, CCW, and speed control work. Can you point me to the thread where this is discussed ?
I do have a relay board I can use if needed.

I tested the acorn turn on again - no lights or heartbeat if the VFD is on before I power the acorn.

Andy

Its buried in all the messages...try and search for VFD or TECO VFD
Did you disconnect the wire from the VFD to Acorn com and the outputs, I assume Acorn starts ok then?
Is there a manual in PDF format you can post for your VFD?
"Jack of all trades, master of none!"
Mesa, AZ

andyolney
Posts: 21
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Re: Anomalous Behavior of Beagle Bone Green on Acorn Board with separate power supplies

Post by andyolney » Mon Feb 05, 2018 5:37 pm

Yes, Acorn starts with both power off to the VFD and the terminals 4 and 5 disconnected.

Attached is the manual, looks like a relevant bit might be this:
clip.JPG
Thanks for the help.
Andy
Attachments
ACE KL Inverter Manual.pdf
(2.69 MiB) Downloaded 2 times

martyscncgarage
Posts: 946
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
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CNC11: Yes
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Location: Mesa, AZ

Re: Anomalous Behavior of Beagle Bone Green on Acorn Board with separate power supplies

Post by martyscncgarage » Tue Feb 06, 2018 10:02 am

andyolney wrote:
Mon Feb 05, 2018 5:37 pm
Yes, Acorn starts with both power off to the VFD and the terminals 4 and 5 disconnected.

Attached is the manual, looks like a relevant bit might be this:
clip.JPG
Thanks for the help.
Andy
Did you measure for DC voltage between COM and FWD? with the VFD wires disconnected from Acorn
It appears to be that COM is at 0 potential an theoretically should be able to be connected to Acorn COM.


Perhaps Matt Centroid Engineer can take a look.
Marty
"Jack of all trades, master of none!"
Mesa, AZ

andyolney
Posts: 21
Joined: Sat Nov 11, 2017 7:26 pm
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Location: Port Townsend, WA

Re: Anomalous Behavior of Beagle Bone Green on Acorn Board with separate power supplies

Post by andyolney » Tue Feb 06, 2018 3:41 pm

I have the common tied together on both the acorn and the vfd, including the 0 to 10 volt speed control.
The voltage between the common and the forward terminal is about 23 volts.
Andy

eng199
Posts: 31
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Re: Anomalous Behavior of Beagle Bone Green on Acorn Board with separate power supplies

Post by eng199 » Wed Feb 07, 2018 10:33 am

Voltage from the VFD input is feeding back into the ACORN output before the ACORN supply starts.

Review the document on the first page of this thread or the sticky post here:
viewtopic.php?f=60&t=1470&sid=d4d62d288 ... ae6df2aea5

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