Charge pump from Mesa 7i96 in 4+1 config?

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6 years 4 months ago - 6 years 4 months ago #170347 by msageryd
Charge pump from Mesa 7i96 in 4+1 config? was created by msageryd
I have my 7i96 in 4+1 configuration, because I need a PWM signal for spindle control.

I also need a charge pump signal. I think this should be about 10 kHz. I haven't found any way to disable the need for a charge pump in my controller. ( www.cnc-step.com/5-channel-stepper-motor-controller/ )

Is it possible to get a 10kHz output from 7i96?
Last edit: 6 years 4 months ago by msageryd.

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6 years 4 months ago - 6 years 4 months ago #170369 by PCW
Replied by PCW on topic Charge pump from Mesa 7i96 in 4+1 config?
Hmm that looks like you would have been better off connecting that box to a 7I92
(or the expansion connector of the 7I96) because you could have a 1:1 cable connection

You can use a free stepgen as a charge-pump signal by setting it into velocity mode
with quadrature outputs and setting the velocity to 10000, something like:
Code:
setp hm2_7i96.0.stepgen.03.control-type 1 # velocity mode setp hm2_7i96.0.stepgen.03.step_type 2 # Quadrature so square wave setp hm2_7i96.0.stepgen.03.maxaccel 0 # default '1' is very slow setp hm2_7i96.0.stepgen.03.maxvel 0 # don't bound frequency setp hm2_7i96.0.stepgen.03.steplen 100 # short so won't interfere with frequency setting setp hm2_7i96.0.stepgen.03.stepspace 100 # short so won't interfere with frequency setting setp hm2_7i96.0.stepgen.03.velocity-cmd 10000 # set frequency to 10 KHz net [some_enable_signal] hm2_7i96.0.stepgen.03.enable # only enable charge pump when desired
Last edit: 6 years 4 months ago by PCW.

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6 years 4 months ago #170370 by msageryd
Replied by msageryd on topic Charge pump from Mesa 7i96 in 4+1 config?
Wow thanks!
Yeah, I suppose a 7i92 would have been way easier. But I also wanted a serial connection for a remote 7i73 which I'll connect to my physical control panel.

I hooked up the step3+ pin to an osciloscope in the hope to see a frequency. All I get is a steady +5V, even after issuing the commands you stated in halcmd. Shouldn't the signal start to oscillate when I manually set enable to true?
setp hm2_7i96.0.stepgen.03.enable true

I've probably missed something stupid.

I can confirm that I have contact with 7i96 by reading input pins.

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6 years 4 months ago - 6 years 4 months ago #170371 by msageryd
Replied by msageryd on topic Charge pump from Mesa 7i96 in 4+1 config?
@PCW In what way could I have a 1-1 connection from the expansion connector? Do you mean that this connector can output step/dir for my axes as well as chargepump, spindle-pwn, e-stop input, limit inputs, etc?
Last edit: 6 years 4 months ago by msageryd.

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6 years 4 months ago #170372 by PCW
Replied by PCW on topic Charge pump from Mesa 7i96 in 4+1 config?
You need to do all the mentioned setup (especially the control_type and step type)

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6 years 4 months ago #170373 by PCW
Replied by PCW on topic Charge pump from Mesa 7i96 in 4+1 config?

msageryd wrote: @PCW In what way could I have a 1-1 connection from the expansion connector? Do you mean that this connector can output step/dir for my axes as well as chargepump, spindle-pwn, e-stop input, limit inputs, etc?


Yes, the 7I96 expansion port can emulate any parallel port type configuration with the appropriate firmware

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