7i76e wiring to KBIC 120 speed controller question
- footpetaljones
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04 Oct 2019 01:19 #147060
by footpetaljones
7i76e wiring to KBIC 120 speed controller question was created by footpetaljones
I have a KBIC 120 controller I wired up to my 7i76e and I was hoping that I would be able to get a quick check on my wiring for it. While searching, I found multiple threads giving warnings about how wiring it incorrectly can lead to blowing it up, so I am hoping to avoid that. Thank you.
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04 Oct 2019 04:40 #147092
by andypugh
Replied by andypugh on topic 7i76e wiring to KBIC 120 speed controller question
I would wait for confirmation from PCW on this.
I think that it is P1 (Low) to Spindle -, P3 (High) to Spindle+ and P2 to spindle-out. The analogue output of the 7i76 is actually a digital potentiometer.
I don't know if you can use I1 and I2 to operate the spindle enable.
What did you base your diagram on?
I think that it is P1 (Low) to Spindle -, P3 (High) to Spindle+ and P2 to spindle-out. The analogue output of the 7i76 is actually a digital potentiometer.
I don't know if you can use I1 and I2 to operate the spindle enable.
What did you base your diagram on?
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- footpetaljones
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04 Oct 2019 11:38 - 04 Oct 2019 11:38 #147111
by footpetaljones
Replied by footpetaljones on topic 7i76e wiring to KBIC 120 speed controller question
I followed what was shown/described in the manual. Page 6 of my manual says that for voltage following analog signal connect between P2 and F-. I would have thought the same as you, to connect to P1, P2, and P3, so that is the main source of my confusion.
Manual
Manual
Last edit: 04 Oct 2019 11:38 by footpetaljones.
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04 Oct 2019 13:22 #147112
by andypugh
Replied by andypugh on topic 7i76e wiring to KBIC 120 speed controller question
Yes, you are right for voltage following, but the 7i76e has an isolated digital potentiometer.
And in voltage following mode the supply voltage has to be an isolated supply (not referenced to frame earth) as P3 is referenced to spindle+.
And in voltage following mode the supply voltage has to be an isolated supply (not referenced to frame earth) as P3 is referenced to spindle+.
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04 Oct 2019 13:23 #147113
by bevins
The ref voltage is 0-7VDC. You could just neg to pin1 and spindle out pin 2. Which is basically emulating a pot. May have to drop voltage with a resister, but I don't see why that wouldn't work.
Replied by bevins on topic 7i76e wiring to KBIC 120 speed controller question
I followed what was shown/described in the manual. Page 6 of my manual says that for voltage following analog signal connect between P2 and F-. I would have thought the same as you, to connect to P1, P2, and P3, so that is the main source of my confusion.
Manual
The ref voltage is 0-7VDC. You could just neg to pin1 and spindle out pin 2. Which is basically emulating a pot. May have to drop voltage with a resister, but I don't see why that wouldn't work.
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05 Oct 2019 05:23 #147155
by andypugh
I think that pin 1 is at +100V, you need to be very careful with it.
Which is why I suggest not connecting anything but KBIC potentiometer terminals to the isolated digital potentiometer on the 7i76.
Replied by andypugh on topic 7i76e wiring to KBIC 120 speed controller question
The ref voltage is 0-7VDC. You could just neg to pin1 and spindle out pin 2. Which is basically emulating a pot. May have to drop voltage with a resister, but I don't see why that wouldn't work.
I think that pin 1 is at +100V, you need to be very careful with it.
Which is why I suggest not connecting anything but KBIC potentiometer terminals to the isolated digital potentiometer on the 7i76.
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- footpetaljones
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06 Oct 2019 01:45 #147230
by footpetaljones
Replied by footpetaljones on topic 7i76e wiring to KBIC 120 speed controller question
I swapped the wiring to follow Andy's recommendation of using P1, P2, and P3 and it worked like a charm. The scale is still off from only being fed 5v, but with only 2000 rpm it isn't too big of a deal. I need to read through the KBIC manual again to see if there is a scale adjustment, but if not I'll look at getting and adjustable PSU Failing that, solder in a resistor to a fixed 10v psu.
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08 Oct 2019 06:13 - 08 Oct 2019 06:13 #147431
by andypugh
Replied by andypugh on topic 7i76e wiring to KBIC 120 speed controller question
I think that there are potentiometers on the board to adjust the speeds.
Last edit: 08 Oct 2019 06:13 by andypugh.
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14 Oct 2019 04:09 #147836
by Benb
Replied by Benb on topic 7i76e wiring to KBIC 120 speed controller question
KB electronics has card model SI-5 (P/N 9443). the card provides isolation for external potentiometer Input.
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16 Nov 2019 12:22 #150468
by biqut2
How exactly did you wire this up? I have the same speed control and it works fine from a pot but when I connect P1 P2 and P3 to the isolated digital pot on the 7i76 I don't get any control.
Replied by biqut2 on topic 7i76e wiring to KBIC 120 speed controller question
I swapped the wiring to follow Andy's recommendation of using P1, P2, and P3 and it worked like a charm. The scale is still off from only being fed 5v, but with only 2000 rpm it isn't too big of a deal. I need to read through the KBIC manual again to see if there is a scale adjustment, but if not I'll look at getting and adjustable PSU Failing that, solder in a resistor to a fixed 10v psu.
How exactly did you wire this up? I have the same speed control and it works fine from a pot but when I connect P1 P2 and P3 to the isolated digital pot on the 7i76 I don't get any control.
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