Retrofitting Realmeca need help

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15 Feb 2023 07:57 #264550 by Arnaud
Replied by Arnaud on topic Retrofitting Realmeca need help
no, I'm trying to find out how to wire the 8 pins.

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13 Mar 2023 13:40 #266552 by Arnaud
Replied by Arnaud on topic Retrofitting Realmeca need help
Hello the retrofit is progressing, currently I have a drift problem about my 3 XYZ axes, they move very slowly under power, I tried to adjust with the balance adjustment screw on the vars but this one is very sensitive.

I was told about OUTPUT OFFSET, how is it used and the calculation?

OUTPUT OFFSET = 0.000
On the other hand I can't find where this offset is connected in HAL,
is it a variable that must be specific to the 7i77? like "analogout0-offset"?

I also have the message when opening "RTAPI: error unexpected realtime delay on task 1...."
Sometimes I have it sometimes I don't, I increased the latency in .INI
SERVO_PERIOD = 1000000
Why am I getting this error? and how to solve?

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13 Mar 2023 15:59 #266564 by tommylight
Replied by tommylight on topic Retrofitting Realmeca need help
Analog servo systems always drift a bit when enabled and no control is active. That is normal and should not be messed with.
Never move the pots on servo drives if they were working properly.
You have wiring issues or pid is not enabled or encoders are not wired properly or set properly in software, etc.
Latency issues are another thing, there are plenty of topic here with the subject of improving latency, but start by disabling everything related to power saving on the PC.
Have a read through this, no skipping:
forum.linuxcnc.org/10-advanced-configura...ning-detailed-how-to

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13 Mar 2023 18:15 #266581 by Arnaud
Replied by Arnaud on topic Retrofitting Realmeca need help
currently my settings 
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13 Mar 2023 19:14 #266590 by tommylight
Replied by tommylight on topic Retrofitting Realmeca need help
That looks good.
Why do you have a base period in the ini file? Are you using a parallel port?
If not, delete the base period line.

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13 Mar 2023 19:32 - 14 Mar 2023 09:43 #266595 by Arnaud
Replied by Arnaud on topic Retrofitting Realmeca need help
No Just the db25.
Why i have this error?

I'm under RTAI not RT-preempt
Last edit: 14 Mar 2023 09:43 by Arnaud.

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16 Mar 2023 08:31 #266811 by Arnaud
Replied by Arnaud on topic Retrofitting Realmeca need help
Good morning,
I came back with these value of SERVO_PERIODE = 500000 


if I run the latency test just at the opening I have this:
 
And after resetting and running for a while:
 
Is this normal doctor?

I do not understand what is happening
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16 Mar 2023 11:10 #266822 by tommylight
Replied by tommylight on topic Retrofitting Realmeca need help
Delete the base period from the ini and hal file.
What does
uname -a
Say?
Did you disable everything with power saving and C states and hyperthreading in BIOS?
Are you using a Mesa 5i25 or 6i25 with the 7i77?

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18 Mar 2023 13:30 #266996 by Arnaud
Replied by Arnaud on topic Retrofitting Realmeca need help
I only have this in the INI file
 

uname -a
 

how disable everything with power saving and C states ?

No Hyperthread

I'm on 6i25 with 7i77
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18 Mar 2023 15:31 #267010 by tommylight
Replied by tommylight on topic Retrofitting Realmeca need help


how disable everything with power saving and C states ?

What motherboard/PC are you using?
Find the info about it and see how to disable everything with power or sleep or.... for the BIOS that board uses.

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