Greg Michalski wrote:
> The manual(s) seem to be lacking on charge pump operation and this being my
> first foray into the world of CNC I have a couple questions:
>
> 1. Does the charge pump run non stop from the time you open EMC till you
> close it (or it crashes) or does it stop on E-Stop condition?
>
That is up to you, based on how you configure your HAL setup.
> 2. To add it to my setup do I need to add anything other than the following
> 4 lines to my machines .hal file:
>
> loadrt charge_pump
> net charge-pump <= charge.pump-out
> addf charge-pump base-thread
> net charge-pump => parport.0.pin-xx-out
You probably need one more:
setp charge-pump.enable 1
That will enable the pump so that it runs continuously until you shut
EMC down. If you only wanted it to run when EMC is not in E-stop, you
would connect the enable pin to an E-stop related signal.
> My intention is to have the charge pump wait for EMC to be running then
> close a contactor supplying the stepper powersupply and the mill control
> circuitry. That allows me a single power button (the CPU) as opposed to 2 or
> 3 and guarantees that only when EMC is control can anything happen and no
> sequencing issues (do this then that, then this - ie human error). I may
> even add a relay to drop the panel power switch out once the charge pump
> engages so that I can't accidentally bump it and upset the OS at all. But I
> don't want the mill and power supply to be shutdown completely with the
> activation of an "E-Stop" or "Machine Power Off". I only want E-stop to
> disable the amplifier enable and the spindle enable, not drop the charge
> pump too. So in short - I want the Charge Pump running the moment EMC2
> successfully loads, till the moment it closes (purposefully or otherwise).
The 'setp' command I described above should do that.
> Am I correct or am I a resident of left field? I am designing my enclosure
> right now and don't have a spare mobo available to temporarily fire up EMC2
> and see what happens until I finish the enclosure setup, which will kind of
> be determined by the functionality of the charge pump...catch 22 anyone?
>
How to do E-stop is an on-going debate. Some people (me included) think
that if you have a charge pump, E-stop should turn it off. That is more
fail-safe than your arrangement, where the pump is running as long as
EMC is running. But the final decision is up to you. Only you know
your machine and your situation.
> The Charge Pump component from the CVS repository (GNU GPL truncated for
> space) is:
>
> // This is a 'charge-pump' component for EMC2 HAL
> // Copyright 2006 Jeff Epler
>
> component charge_pump "Create a square-wave for the 'charge pump' input of
> some controller boards";
> option singleton yes;
> pin out bit out "Square wave if 'enable' is TRUE or unconnected, low if
> 'enable' is FALSE";
> pin in bit enable = TRUE "If FALSE, forces 'out' to be low";
> function _ nofp "Toggle the output bit (if enabled)";
> license "GPL";
> ;;
> FUNCTION(_) {
> if ( enable ) {
> out = !out;
> } else {
> out = 0;
> }
> }
>
> Not being that well versed in coding (been a very long time) I'm confused.
> Do I need to somehow send an enable the charge pump - and how do I go about
> doing that automatically as I verbosely stated above?
Yes, the enable pin turns the charge pump on and off. Setting it true
with 'setp charge-pump.enable 1' is all you need to make the pump run
all the time. If you wanted to turn the pump on and off, the enable pin
is how you would do that.
>
> Thanks.
>
> Greg
Hope this helps,
John Kasunich
-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference
Don't miss this year's exciting event. There's still time to save $100.
Use priority code J8TL2D2.
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
