LinuxCNC Support Forum :: Topic: 7i77 testers wanted (20/26)

PCW OFFLINE Moderator Posts: 1644 Thank you received: 86 Karma: 116	Yes, changing the sign on maxscale should reverse the output polarity Why do the enable outputs not work? Normally drive enables require either a pulldown to ground or a pullup to some voltage to enable. The 7I77 enable outputs can do either of these. (within their 100V 50 mA limits)
	The administrator has disabled public write access.

Re:7i77 testers wanted 28 Mai 2012 16:11 #20472

maxvdh
OFFLINE
Senior Boarder
Posts: 69
Karma: 0

PCW wrote:

Yes, changing the sign on maxscale should reverse the output polarity

Why do the enable outputs not work? Normally drive enables require either a pulldown to ground or a pullup to some voltage to enable. The 7I77 enable outputs can do either of these. (within their 100V 50 mA limits)

I meant that the current configuration, where I'm trying to use X-enable, Y-enable, and Z-enable output pins offered as a choice in PNCConf. The 7i77 servo enable circuits do work, I believe. I haven't tested them with the servos yet but they work well for the spindle. I need to connect them up such that they will supply a 24V field I/O signal to the servo amplifier enable relays.

The administrator has disabled public write access.

Re:7i77 testers wanted 28 Mai 2012 17:16 #20473

PCW OFFLINE Moderator Posts: 1644 Thank you received: 86 Karma: 116	Oh OK, just wanted to mention that they should pretty much always work for enables (other than direct relay driving of more than 50 ma) BTW something must be setting the analog enables on or the analog outs will be at 0V
	The administrator has disabled public write access.

Re:7i77 testers wanted 28 Mai 2012 21:30 #20476

maxvdh
OFFLINE
Senior Boarder
Posts: 69
Karma: 0

andypugh wrote:

maxvdh wrote:

net estop-out hm2_5i25.0.7i77.0.0.output-00
net xenable hm2_5i25.0.7i77.0.0.output-03

Well, these are half of it, defining signals and where they need to go to. What I don't see in the lines you have pasted is where the signals come from.
I would rather expect to see, for example
net estop-out halui.estop.is-activated
because estop-out is just a signal name, and it has no meaning to LinuxCNC. halui.estop.is-activated, however, is an output pin driven by LinuxCNC.
The same is true for xenable, I would expect it to be netted to axis.0.amp-enable-out

(Yes, i do know most of these pin names off by heart, but they are all listed in the docs for example:
www.linuxcnc.org/docview/html/gui/halui.html
www.linuxcnc.org/docview/html/man/man9/motion.9.html
Knowing where to look for each one is a bit more difficult)

net jog-incr-a => jogincr.sel0
net jog-incr-b => jogincr.sel1
net jog-incr-c => jogincr.sel2
net jog-incr-d => jogincr.sel3

Here we have the reverse problem, I don't see where jog-incr-a etc are driven from. I would expect them to be wired to gpio and from there to the jog-speed selector switch.

Turns out pin misspelling was the issue with this one. It is "x-enable" that is netted to axis.0.amp-enable-out. HAL file said "xenable", no dash. That's one problem solved. THANKS!

Still wondering about the lack of positive DAC output for the spindle when the spindle runs in reverse, as was discussed in that thread I mentioned. Is there something I can do to properly configure this in PWM "mode 1"?

The administrator has disabled public write access.

Re:7i77 testers wanted 29 Mai 2012 06:35 #20481

PCW OFFLINE Moderator Posts: 1644 Thank you received: 86 Karma: 116	The 7I77 does not have any PWM modes. If your VFD cannot be configured for +-10V operation, the ABS component must be inserted to make the spindle speed request always positive
	The administrator has disabled public write access.