PlasmaC Z axis following error
14 May 2020 18:15 - 14 May 2020 18:27 #167767
by Clive S
PlasmaC Z axis following error was created by Clive S
I can't seem to find out where the error is coming from with the Z axis.
I only seem to get this when a program in running and I hit stop. The Z start to move up then error.
It is fine when hitting pause. And jogging up and down is no problem.
I have tried various values of MAX_VELOCITY and MAX_ACCELERATION etc
The motor is a nema 23 with a 5mm ball screw
I know PlasmaC take care of the Z axis but can't see it making any difference than normal control
I only seem to get this when a program in running and I hit stop. The Z start to move up then error.
It is fine when hitting pause. And jogging up and down is no problem.
[AXIS_Z]
MIN_LIMIT = -72
MAX_LIMIT = -4
# set to double the value in the corresponding joint
MAX_VELOCITY = 60
# set to double the value in the corresponding joint
MAX_ACCELERATION = 800
# shares the above two equally between the joint and the offset
OFFSET_AV_RATIO = 0.5
[JOINT_1]
AXIS = Z
MIN_LIMIT = -82
MAX_LIMIT = -4
MAX_VELOCITY = 30
MAX_ACCELERATION = 400
TYPE = LINEAR
SCALE = -800
STEPGEN_MAX_VEL = 37.5
STEPGEN_MAX_ACC = 500
FERROR = 1
MIN_FERROR = 0.25
DIRSETUP = 10000
DIRHOLD = 10000
STEPLEN = 10000
STEPSPACE = 10000
DEADBAND = 0
P = 1000
I = 0
D = 0
FF0 = 0
FF1 = 1
FF2 = 0.00015
BIAS = 0
MAX_OUTPUT = 0
MAX_ERROR = 0
HOME = -5
HOME_OFFSET = 1
HOME_SEARCH_VEL = 10
HOME_LATCH_VEL = -2
HOME_FINAL_VEL = 5
HOME_SEQUENCE = 0
HOME_USE_INDEX = False
HOME_IGNORE_LIMITS = TrueI have tried various values of MAX_VELOCITY and MAX_ACCELERATION etc
The motor is a nema 23 with a 5mm ball screw
I know PlasmaC take care of the Z axis but can't see it making any difference than normal control
Last edit: 14 May 2020 18:27 by Clive S. Reason: added text
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14 May 2020 18:25 - 14 May 2020 18:26 #167769
by tommylight
Replied by tommylight on topic PlasmaC Z axis following error
Change the max and min travel to positive values, min can be a nit on the negative but preferably not under -20.
And you have max_velocity and max_acceleration twice there, delete the second set.
Also change the homing and offset to reflect the changes in workspace.
And you have max_velocity and max_acceleration twice there, delete the second set.
Also change the homing and offset to reflect the changes in workspace.
Last edit: 14 May 2020 18:26 by tommylight. Reason: More info
The following user(s) said Thank You: Clive S
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14 May 2020 18:30 #167770
by PCW
Replied by PCW on topic PlasmaC Z axis following error
[AXIS_Z]
......
MAX_ACCELERATION = 800
......
STEPGEN_MAX_ACC = 500
I would change STEPGEN_MAX_ACC to 1000 and try again
......
MAX_ACCELERATION = 800
......
STEPGEN_MAX_ACC = 500
I would change STEPGEN_MAX_ACC to 1000 and try again
The following user(s) said Thank You: Clive S
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14 May 2020 19:15 - 14 May 2020 22:16 #167774
by Clive S
Tom I noticed for the first time that the limits are not the same in the two sections.. ie min limit -72 and -82
Replied by Clive S on topic PlasmaC Z axis following error
Change the max and min travel to positive values, min can be a nit on the negative but preferably not under -20.
And you have max_velocity and max_acceleration twice there, delete the second set.
Also change the homing and offset to reflect the changes in workspace.
Tom I noticed for the first time that the limits are not the same in the two sections.. ie min limit -72 and -82
Last edit: 14 May 2020 22:16 by Clive S.
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14 May 2020 19:29 #167775
by tommylight
But they have to be positive values for PlasmaC, so 72 or 82mm, whatever your machine can do in Z travel.
That is also where the home should be. PlasmaC uses reverse values for Z axis, or i should say PlasmaC uses real life values for Z, not the reverse as mills do. So the upper limit 82, lower limit 0 or thereabouts.
Replied by tommylight on topic PlasmaC Z axis following error
That is not very important as it will work even that way.
Tom I noticed for the first time that the limits are not the same in the two sections.. ie min limit -72 and -82
But they have to be positive values for PlasmaC, so 72 or 82mm, whatever your machine can do in Z travel.
That is also where the home should be. PlasmaC uses reverse values for Z axis, or i should say PlasmaC uses real life values for Z, not the reverse as mills do. So the upper limit 82, lower limit 0 or thereabouts.
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15 May 2020 07:57 #167814
by Clive S
Replied by Clive S on topic PlasmaC Z axis following error
Can you please give me a sanity check re:
[AXIS_Z]
MIN_LIMIT = -82
MAX_LIMIT = -4
# set to double the value in the corresponding joint
MAX_VELOCITY = 60
# set to double the value in the corresponding joint
MAX_ACCELERATION = 800
# shares the above two equally between the joint and the offset
OFFSET_AV_RATIO = 0.5
[JOINT_1]
AXIS = Z
MIN_LIMIT = -82
MAX_LIMIT = -4
MAX_VELOCITY = 30
MAX_ACCELERATION = 400
TYPE = LINEAR
SCALE = -800
STEPGEN_MAX_VEL = 37.5 (Is this line required as the docs call it STEPGEN_MAXVEL but says it is not required)
STEPGEN_MAX_ACC = 500 ( Is this spelt correct as the docs call it STEPGEN_MAXACCEL)
I am trying to sort out a problem with Z following error only on hitting the stop button when the Z start going up pause is fine.
Peter suggested that I try changing STEPGEN_MAX_ACC = 500 to 1000
But I would like to make sure the format in the INI file above is correct as the name is the PlasmaC sim are different
[AXIS_Z]
MIN_LIMIT = -82
MAX_LIMIT = -4
# set to double the value in the corresponding joint
MAX_VELOCITY = 60
# set to double the value in the corresponding joint
MAX_ACCELERATION = 800
# shares the above two equally between the joint and the offset
OFFSET_AV_RATIO = 0.5
[JOINT_1]
AXIS = Z
MIN_LIMIT = -82
MAX_LIMIT = -4
MAX_VELOCITY = 30
MAX_ACCELERATION = 400
TYPE = LINEAR
SCALE = -800
STEPGEN_MAX_VEL = 37.5 (Is this line required as the docs call it STEPGEN_MAXVEL but says it is not required)
STEPGEN_MAX_ACC = 500 ( Is this spelt correct as the docs call it STEPGEN_MAXACCEL)
I am trying to sort out a problem with Z following error only on hitting the stop button when the Z start going up pause is fine.
Peter suggested that I try changing STEPGEN_MAX_ACC = 500 to 1000
But I would like to make sure the format in the INI file above is correct as the name is the PlasmaC sim are different
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15 May 2020 08:03 #167815
by phillc54
Replied by phillc54 on topic PlasmaC Z axis following error
AFAIK it is STEPGEN_MAXACCEL
STEPGEN_MAXVEL is not required
STEPGEN_MAXVEL is not required
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15 May 2020 08:24 - 15 May 2020 08:32 #167816
by Clive S
Thanks Phill so if I have it spelt wrong (might be from 2.7) the numbers I have been changing might not be being used !!
I will alter them and see what happens. The Z seems to work fine re: the limits are they OK as min and max being -ve as I have them
You mentioned dropping back to 2.8 how is that achieved ?
Edit
I have just looked in the HAL file and it is pointing to the same names
setp hm2_[HOSTMOT2](BOARD).0.stepgen.01.maxvel [JOINT_1]STEPGEN_MAX_VEL
setp hm2_[HOSTMOT2](BOARD).0.stepgen.01.maxaccel [JOINT_1]STEPGEN_MAX_ACC
so I will have to change those as well
Replied by Clive S on topic PlasmaC Z axis following error
AFAIK it is STEPGEN_MAXACCEL
STEPGEN_MAXVEL is not required
Thanks Phill so if I have it spelt wrong (might be from 2.7) the numbers I have been changing might not be being used !!
I will alter them and see what happens. The Z seems to work fine re: the limits are they OK as min and max being -ve as I have them
You mentioned dropping back to 2.8 how is that achieved ?
Edit
I have just looked in the HAL file and it is pointing to the same names
setp hm2_[HOSTMOT2](BOARD).0.stepgen.01.maxvel [JOINT_1]STEPGEN_MAX_VEL
setp hm2_[HOSTMOT2](BOARD).0.stepgen.01.maxaccel [JOINT_1]STEPGEN_MAX_ACC
so I will have to change those as well
Last edit: 15 May 2020 08:32 by Clive S.
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15 May 2020 08:55 #167823
by phillc54
Replied by phillc54 on topic PlasmaC Z axis following error
Oh, you must have used that off-site configuration tool rather than Pncconf
Just follow this procedure:
linuxcnc.org/docs/2.8/html/plasma/plasma...u_have_linuxcnc_v2_7
from this line:
"Close the terminal, then from the Main Menu, open Synaptic Package Manager"
of course you wouldn't have a terminal open so you won't need to close it.
Just follow this procedure:
linuxcnc.org/docs/2.8/html/plasma/plasma...u_have_linuxcnc_v2_7
from this line:
"Close the terminal, then from the Main Menu, open Synaptic Package Manager"
of course you wouldn't have a terminal open so you won't need to close it.
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15 May 2020 09:28 #167826
by Clive S
Replied by Clive S on topic PlasmaC Z axis following error
Phill I would like to do a fresh install of 2.8 I have an ISO for that.
Can I just copy my config folder to the new install and is it possible to go back to PlasmaC V0.123
Can I just copy my config folder to the new install and is it possible to go back to PlasmaC V0.123
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