PID error

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16 Jun 2018 11:09 #112463 by snujcnc
PID error was created by snujcnc
i face strange issue

when i enable my c axis it shows pid error between 1 to 9 any value and it is different every time when i enable

i ahhached image for c pid when enabled and when not enabled

now issue is i can see this pid error value all time but same time command and feedback is ok it is almost similar

so why it shows pid error

can anyone help me for this

i also fave strange issue this pid error
i use total 9 axis setup

pid error some time shows in c,v,u axis

some time it show only on B axis and some time C axis

now this behaviour i am not able to understand

i am sure i make some mistake but what that i want to know


i am working on this machine since 2 year but during this time this machine runaway two times why that i don’t know

but when i try to see hal configuration i found f.error is there in any of 9 axis

please guide me if possible
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16 Jun 2018 17:25 #112485 by PCW
Replied by PCW on topic PID error
A PID error is expected anytime the PID is enabled,
what is important is the size of the error
( the error you show is only .0000206)

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19 Jun 2018 08:43 #112568 by snujcnc
Replied by snujcnc on topic PID error
But error show more then 2,0 to 9

even if no difference between command and feedback

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19 Jun 2018 08:48 #112569 by snujcnc
Replied by snujcnc on topic PID error
i am trying to find out this because when i power up 9 axis configuration machine

i face problem

when i jog axis it shows following error in axis

but error came in any axis of my 9 axis config machine
after one or two minute axis work fine

i am not able to understand what is problem with my system

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20 Jun 2018 17:28 #112644 by PCW
Replied by PCW on topic PID error
What kind of kinematics do you have?
Following errors are often associated with math problems in the kinematics

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26 Jun 2018 13:18 #112887 by andypugh
Replied by andypugh on topic PID error

But error show more then 2,0 to 9


I think you might be mis-reading the number.

2.062E-5 = 0.00002062
9.9999E-10 = 0.000000000999999
So if the error is very small it will _always_ begin with a number between 1 and 9.
The following user(s) said Thank You: snujcnc

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