shaileshal

I am facing some what similar issue and am unable to understand what really is wrong.

I have disabled all limit switches of all axis, except Xmin limit switch is enabled and set for ONLY acting as HOMING limit switch.

**************************************************************

01/01/2009 02:13:56.638 [TX] – $x<CR><LF>

01/01/2009 02:13:58.220 [RX] – [xam] x axis mode                 1 [standard]<LF>

[xvm] x velocity maximum        600.000 mm/min<LF>

[xfr] x feedrate maximum        600.000 mm/min<LF>

[xtm] x travel maximum          150.000 mm<LF>

[xjm] x jerk maximum       20000000 mm/min^3<LF>

[xjh] x jerk homing        20000000 mm/min^3<LF>

[xjd] x junction deviation        0.0500 mm (larger is faster)<LF>

[xsn] x switch min                1 [0=off,1=homing,2=limit,3=limit+homing]<LF>

[xsx] x switch max                0 [0=off,1=homing,2=limit,3=limit+homing]<LF>

[xsv] x search velocity         500.000 mm/min<LF>

[xlv] x latch velocity          100.000 mm/min<LF>

[xlb] x latch backoff            10.000 mm<LF>

[xzb] x zero backoff              2.000 mm<LF>

tinyg [mm] ok> <LF>

tinyg [mm] ok> <LF>

**************************************************************

I have the limit switch connected as NC and set the $st = 1.

Now we move the slide to some position as below:

**************************************************************

01/01/2009 02:14:25.013 [TX] – g1x-20f300<CR><LF>

 

01/01/2009 02:14:35.048 [RX] – tinyg [mm] ok> <LF>

line:0,posx:-0.000,posy:0.000,posz:0.000,posa:0.000,feed:0.000,vel:0.272,unit:1,coor:1,dist:0,frmo:0,momo:1,stat:5<LF>

tinyg [mm] ok> <LF>

posx:-0.016,vel:27.162<LF>

posx:-0.124,vel:108.646<LF>

posx:-0.404,vel:221.503<LF>

posx:-0.833,vel:286.691<LF>

posx:-1.324,vel:300.000<LF>

posx:-1.823<LF>

posx:-2.298<LF>

posx:-2.797<LF>

posx:-3.296<LF>

posx:-3.796<LF>

posx:-4.270<LF>

posx:-4.769<LF>

posx:-5.269<LF>

posx:-5.768<LF>

posx:-6.242<LF>

posx:-6.742<LF>

posx:-7.241<LF>

posx:-7.740<LF>

posx:-8.215<LF>

posx:-8.714<LF>

posx:-9.213<LF>

posx:-9.713<LF>

posx:-10.187<LF>

posx:-10.686<LF>

posx:-11.186<LF>

posx:-11.685<LF>

posx:-12.159<LF>

posx:-12.659<LF>

posx:-13.158<LF>

posx:-13.657<LF>

posx:-14.132<LF>

posx:-14.631<LF>

posx:-15.130<LF>

posx:-15.605<LF>

posx:-16.104<LF>

posx:-16.603<LF>

posx:-17.103<LF>

posx:-17.577<LF>

posx:-18.077<LF>

posx:-18.576<LF>

posx:-19.071,vel:294.500<LF>

posx:-19.520,vel:242.893<LF>

posx:-19.836,vel:137.506<LF>

posx:-19.969,vel:45.903<LF>

posx:-20.000,vel:2.445<LF>

posx:-20.000,vel:0.000,stat:3<LF>

**************************************************************

After this we set this position as home position using following command:

**************************************************************

01/01/2009 02:14:41.669 [TX] – g28.1<CR><LF>

 

01/01/2009 02:14:45.014 [RX] – tinyg [mm] ok> <LF>

tinyg [mm] ok> <LF>

**************************************************************

Now in order to test the HOMING cycle, we move to some other position as follows:

**************************************************************

01/01/2009 02:14:48.872 [TX] – g1x50<CR><LF>

 

01/01/2009 02:14:53.401 [RX] – tinyg [mm] ok> <LF>

posx:-20.000,vel:0.272,stat:5<LF>

tinyg [mm] ok> <LF>

posx:-19.981,vel:29.946<LF>

posx:-19.867,vel:114.147<LF>

posx:-19.578,vel:226.052<LF>

posx:-19.143,vel:288.524<LF>

posx:-18.651,vel:300.000<LF>

posx:-18.151<LF>

posx:-17.676<LF>

posx:-17.176<LF>

posx:-16.676<LF>

posx:-16.177<LF>

posx:-15.702<LF>

posx:-15.202<LF>

posx:-14.702<LF>

posx:-14.202<LF>

posx:-13.727<LF>

posx:-13.228<LF>

posx:-12.728<LF>

posx:-12.228<LF>

posx:-11.753<LF>

posx:-11.253<LF>

posx:-10.754<LF>

posx:-10.254<LF>

posx:-9.779<LF>

posx:-9.279<LF>

posx:-8.779<LF>

posx:-8.279<LF>

posx:-7.805<LF>

posx:-7.305<LF>

posx:-6.805<LF>

posx:-6.305<LF>

posx:-5.830<LF>

posx:-5.330<LF>

posx:-4.831<LF>

posx:-4.356<LF>

posx:-3.856<LF>

posx:-3.356<LF>

posx:-2.856<LF>

posx:-2.382<LF>

posx:-1.882<LF>

posx:-1.382<LF>

posx:-0.882<LF>

posx:-0.407<LF>

posx:0.093<LF>

posx:0.592<LF>

posx:1.092<LF>

posx:1.567<LF>

posx:2.067<LF>

posx:2.567<LF>

posx:3.067<LF>

posx:3.541<LF>

posx:4.041<LF>

posx:4.541<LF>

posx:5.041<LF>

posx:5.516<LF>

posx:6.016<LF>

posx:6.515<LF>

posx:7.015<LF>

posx:7.490<LF>

posx:7.990<LF>

posx:8.490<LF>

posx:8.964<LF>

posx:9.464<LF>

posx:9.964<LF>

posx:10.464<LF>

posx:10.939<LF>

posx:11.439<LF>

posx:11.938<LF>

posx:12.438<LF>

posx:12.913<LF>

posx:13.413<LF>

posx:13.913<LF>

posx:14.413<LF>

posx:14.887<LF>

posx:15.387<LF>

posx:15.887<LF>

posx:16.387<LF>

posx:16.862<LF>

posx:17.362<LF>

posx:17.861<LF>

posx:18.361<LF>

posx:18.836<LF>

posx:19.336<LF>

posx:19.836<LF>

posx:20.336<LF>

posx:20.810<LF>

posx:21.310<LF>

posx:21.810<LF>

posx:22.285<LF>

posx:22.785<LF>

posx:23.285<LF>

posx:23.784<LF>

posx:24.259<LF>

posx:24.759<LF>

posx:25.259<LF>

posx:25.759<LF>

posx:26.234<LF>

posx:26.734<LF>

posx:27.233<LF>

posx:27.733<LF>

posx:28.208<LF>

posx:28.708<LF>

posx:29.208<LF>

posx:29.708<LF>

posx:30.182<LF>

posx:30.682<LF>

posx:31.182<LF>

posx:31.682<LF>

posx:32.157<LF>

posx:32.657<LF>

posx:33.156<LF>

posx:33.656<LF>

posx:34.131<LF>

posx:34.631<LF>

posx:35.131<LF>

posx:35.605<LF>

posx:36.105<LF>

posx:36.605<LF>

posx:37.105<LF>

posx:37.580<LF>

posx:38.079<LF>

posx:38.579<LF>

posx:39.079<LF>

posx:39.554<LF>

posx:40.054<LF>

posx:40.553<LF>

posx:41.053<LF>

posx:41.528<LF>

posx:42.028<LF>

posx:42.528<LF>

posx:43.027<LF>

posx:43.502<LF>

posx:44.002<LF>

posx:44.502<LF>

posx:45.002<LF>

posx:45.476<LF>

posx:45.976<LF>

posx:46.476<LF>

posx:46.976<LF>

posx:47.451<LF>

posx:47.950<LF>

posx:48.450<LF>

posx:48.949,vel:298.914<LF>

posx:49.395,vel:264.079<LF>

posx:49.760,vel:174.445<LF>

posx:49.947,vel:65.256<LF>

posx:49.998,vel:8.216<LF>

posx:50.000,vel:0.000,stat:3<LF>

**************************************************************

Now we enter the HOMING command :

**************************************************************

01/01/2009 02:15:13.450 [TX] – g28<CR><LF>

**************************************************************

Then the motor starts moving, after some movement we press the Xmin limit switch and release the same.

We don’t see that this Homing Limit switch press is not detected, nor the movement is stopped and re-started in opposite direction.

Below is the output after HOMING command.

**************************************************************

01/01/2009 02:15:16.721 [RX] – tinyg [mm] ok> <LF>

posx:50.000,vel:0.275,momo:0,stat:5<LF>

tinyg [mm] ok> <LF>

posx:49.984,vel:27.548<LF>

posx:49.873,vel:110.193<LF>

posx:49.578,vel:247.934<LF>

posx:49.018,vel:413.774<LF>

posx:48.267,vel:529.477<LF>

posx:47.332,vel:588.361<LF>

posx:46.339,vel:600.000<LF>

posx:45.339<LF>

posx:44.340<LF>

posx:43.390<LF>

posx:42.390<LF>

posx:41.390<LF>

posx:40.391<LF>

posx:39.441<LF>

posx:38.441<LF>

posx:37.442<LF>

posx:36.492<LF>

posx:35.492<LF>

posx:34.493<LF>

posx:33.493<LF>

posx:32.543<LF>

posx:31.544<LF>

posx:30.544<LF>

posx:29.544<LF>

posx:28.595<LF>

posx:27.595<LF>

posx:26.595<LF>

posx:25.596<LF>

posx:24.646<LF>

posx:23.646<LF>

posx:22.647<LF>

posx:21.647<LF>

posx:20.698<LF>

posx:19.698<LF>

posx:18.698<LF>

posx:17.699<LF>

posx:16.749<LF>

posx:15.749<LF>

posx:14.750<LF>

posx:13.750<LF>

posx:12.800<LF>

posx:11.801<LF>

posx:10.801<LF>

posx:9.851<LF>

posx:8.852<LF>

posx:7.852<LF>

posx:6.853<LF>

posx:5.903<LF>

posx:4.903<LF>

posx:3.904<LF>

posx:2.904<LF>

posx:1.954<LF>

posx:0.955<LF>

posx:-0.045<LF>

posx:-1.045<LF>

posx:-1.994<LF>

posx:-2.994<LF>

posx:-3.994<LF>

posx:-4.993<LF>

posx:-5.943<LF>

posx:-6.943<LF>

posx:-7.942<LF>

posx:-8.942<LF>

posx:-9.891<LF>

posx:-10.891<LF>

posx:-11.891<LF>

posx:-12.890<LF>

posx:-13.840<LF>

posx:-14.840<LF>

posx:-15.839<LF>

posx:-16.789,vel:599.725<LF>

posx:-17.766,vel:569.628<LF>

posx:-18.644,vel:484.229<LF>

posx:-19.333,vel:343.733<LF>

posx:-19.755,vel:179.132<LF>

posx:-19.946,vel:66.185<LF>

posx:-19.998,vel:9.917<LF>

posx:-20.000,vel:0.000,stat:3<LF>

**************************************************************

We have ensured that the motor polarity is correct to the direction the motor is moving.

What can be the reason for this kind of behaviour ????

I have gone through the Homing troubleshooting wiki but nothing is helping.

Kindly provide whether this is a problem or what????