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have you tried the debounce input setting in general config? had a similar issue long time ago and debounce cured it. don't remember what I had to set it at but it worked.
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haven't used Mach3 for quite a while. Chuck ----- Original Message -----
From: "John Dammeyer" <johnd@...> To: <[email protected]> Sent: Tuesday, January 28, 2020 3:45 PM Subject: Re: [MachCNC] Electrical Noise I went into the config page and checked the 5kHz charge pump. The only repeatable failure I'm getting on a regular basis is when I home the Z axis. Here's what happens: 1. Ref All Home button. a. Z axis Knee (Gecko Stepper driver with 1200oz-in motor, 60VDC) heads down at about F10 b. Z axis knee stops with ESTOP message. c. This happens a number of times until it finally makes it to the home switch. d. Then X and Y (HP_UHU Brushed DC Servo 105VDC) silently move to their home positions no problems. 2. G00 X0 Y0 Z0 which is mid table and mid Z distance a. All axis move simultaneously. 3. G01 Z4.000 F10.0 to move knee back close to home/limit switch a. Moves perfectly at same speed as homing. So while moving the system theoretically is always looking for the limit switch. While Homing the system is looking for the home/limit switch. The only thing moving is the Z and at roughly the same speed as homing. But it won't stop with a move. 4 or 5 tries with an ESTOP while homing. None of this happens with the parallel port interface under LinuxCNC (same hardware, dual boot to other system). So I'd say the noise filtering on the home/limit switch is different for homing under MACH than it is under normal motion while under LinuxCNC the filtering is the same for both operations. Therefore I need to look at how the limit switches might be picking up noise of course and add some ferrites to the Stepper motor cable. They are Normally closed micro-switches connected directly to the PMDX-126 inputs. But that all the other motion operations do not have an ESTOP puts the issue squarely with MACH3 Homing operation. And the up side is that if I can rewire my Stepper Motor for the knee with better shielding and ferrites so that it doesn't ESTOP on homing then I know I'll have eradicated noise at the source. Which is a good thing. But still curious why only MACH and only with homing. Suggestions? Thanks John From: [email protected] [mailto:[email protected]] On Behalf Of Dan Mauch Sent: January-28-20 10:03 AM To: [email protected] Subject: Re: [MachCNC] Electrical Noise Years ago there was an issue with the charge pump frequency not associated with a laser. It was many years ago but you might try to do a search in the archives about charge pump freq. I vaguely recall that some devices had a problem and that they fixed it but not sure how. Dan Mauch |
