Centroid Community CNC Support Forum

tblough wrote: ↑Sat Mar 21, 2020 12:42 pm Don't know if it will help, but you could try a 100nf capacitor across the VFD analog input terminals.

You mean put the capacitor between acorn and the VFD?

martyscncgarage wrote: ↑Sat Mar 21, 2020 12:43 pm I would go with Tom's earlier suggestion then with that board. It does not appear to be an Acorn issue.

New info. If I hold the wires with my hands the voltage drops a little bit.

Can be ground issues ?

You might be misunderstanding me. I want you NOT to use the wire in the plastic wireway. I want you to make up a pair of wires long enough to go from Acorn analog output to the VFD analog input EXTERNALLY and retest. The purpose is to see if you have any voltage or noise being induced on the pair o...

Ok, I want you to disconnect the analog wires at Acorn and at the VFD. I want you to make up a pair of wires (about 18 gauge), twist them together. Long enough to reach from Acorn analog output to the VFD loosely, and connect them and restest. (Do not put them in the wireway, bypass it) keep them a...

Even worse.

With acorn plugged of I measure on the analog input of the VFD it reads 1.5v

What the hell???

Thank you for posting the video. First command an M3s0 Then Command an M5 This should force Acorn t near 0 vdc Measure the voltage ON Acorn terminals with the VFD connected. What are you getting? If you have any voltage on the wires, unplug the Analog connector on Acorn and check the Analog input t...

My apologies, I missed you posted the manual link. Yes, I agree Acorn +analog output to VFD Terminal 8 (Analog Input 1 Voltage) Acorn -(Com) analog output to VFD Terminal 7 (GND) Ok here is the link to the YouTube video of the test. This is very frustrating. I hope this can pop some lights. https:/...

Did you bench test the VFD without connecting it to Acorn? Put a jumper from VFD common to forward, and use a common battery, and connect it's polarity to the VFD analog input common and 0-10vdc input? Yes I did as on your Video on youtube. Without the VFD attached the voltages are spot on at the a...

Did you bench test the VFD without connecting it to Acorn? Put a jumper from VFD common to forward, and use a common battery, and connect it's polarity to the VFD analog input common and 0-10vdc input? Yes I did as on your Video on youtube. Without the VFD attached the voltages are spot on at the a...

martyscncgarage wrote: ↑Fri Mar 20, 2020 2:23 pm You didn't answer the questions. Make and model of the VFD and provide sketch of how you wired it to VFD. Not doubting you, double checking you....I can't "See what you See"

Page 22 on the attached user manual.

I have wired to the 7 and 8 on the NPN configuration.