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Author Topic: CNC4PC C11G Analog Output Spindle Control  (Read 14923 times)

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Re: CNC4PC C11G Analog Output Spindle Control
« Reply #20 on: January 04, 2010, 11:22:32 PM »
Personally, I'd take a PWM spindle control interface over a Step/Dir charge pump any day.  Peter Homanns DC03 works flawlessly, and is VERY accurate and linear.  I can typically set VFD frequency to with 0.5Hz or better.

Regards,
Ray L.
Regards,
Ray L.
Re: CNC4PC C11G Analog Output Spindle Control
« Reply #21 on: January 05, 2010, 01:55:49 AM »
Personally, I'd take a PWM spindle control interface over a Step/Dir charge pump any day.  Peter Homanns DC03 works flawlessly, and is VERY accurate and linear.  I can typically set VFD frequency to with 0.5Hz or better.

Regards,
Ray L.


Me too. :)
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Homann Designs
http://www.homanndesigns.com
email: peter at homanndesigns.com

Offline ftec

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Re: CNC4PC C11G Analog Output Spindle Control
« Reply #22 on: January 05, 2010, 02:28:01 AM »
Personally, I'd take a PWM spindle control interface over a Step/Dir charge pump any day.  Peter Homanns DC03 works flawlessly, and is VERY accurate and linear.  I can typically set VFD frequency to with 0.5Hz or better.

Regards,
Ray L.

Me too. :)

Very tempting, but I'd rather have used serial communications for the VFD if it only were possible with this Chinese thingie. With other benefits it would free the pin 14 for the 5th servo axis when using  C11 card.
« Last Edit: January 05, 2010, 02:29:57 AM by ftec »
Re: CNC4PC C11G Analog Output Spindle Control
« Reply #23 on: January 05, 2010, 07:12:27 AM »
Hi,

Yes, I know what you mean. It wouldn't be too hard to do a Modbus to the Chinese VFD converter. Just not enough time to do everything.



Cheers,


Peter.
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Homann Designs
http://www.homanndesigns.com
email: peter at homanndesigns.com

Offline ftec

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"Error" in C11 manual - pin14 frequency
« Reply #24 on: January 06, 2010, 06:48:49 AM »
Regarding my reply #18 there is a little more to it.

The C11 manual says that you need to set the Velocity to max in the Motor tuning /Spindle. Then it also says (which first slipped my attention) that the C11 card requires a 25kHz pulse train in pin 14. This means that setting the spindle speed to max applies only when using the 25kHz Kernel speed. With higher Kernel speeds the spindle speed should be set so that Steps * Vel / 60s  = 25kHz. The linarity changes if the frequency is changed to what the manual says. I decided to keep the Vel in max though I use a Kernel speed of 45kHz.
Re: CNC4PC C11G Analog Output Spindle Control
« Reply #25 on: January 06, 2010, 05:21:32 PM »
1- The VFD I am using ( a 15HP GS3 from automation direct) has an analog output supply of 10V at 20mA max.  The C11G has a required input of 12V @50mA.  Do I really need another isolated power supply?  I feel like I have about enough in that control panel...  24VDC, 24VAC, 12VDC for the drives, 60VDC for the servos, and on and on.....

Doesn't the GS3 have RS485 ModBus?  Try controlling the RPMs/Hzs via Modbus.  You should be able to the achieve the target RPMs with no problems...

We use ModBus to control our 10HP Spindle
<a href="http://www.youtube.com/v/QUB8hFWrnfw&amp;hl=en&amp;fs=1&amp;rel=0&amp;color1=0x006699&amp;color2=0x54abd6&amp;border=1" target="_blank" class="new_win">http://www.youtube.com/v/QUB8hFWrnfw&amp;hl=en&amp;fs=1&amp;rel=0&amp;color1=0x006699&amp;color2=0x54abd6&amp;border=1</a>

JH
« Last Edit: January 06, 2010, 05:24:29 PM by JHChoppers »