A small question about AC SERVO brake.
20 Mar 2019 13:32 #129057
by thang
A small question about AC SERVO brake. was created by thang
Is it ok if i turn servo on but i dont release brake? For some reasons I want to release brake by another signal differance than servo on signal and do it manually.
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20 Mar 2019 13:34 #129059
by pl7i92
Replied by pl7i92 on topic A small question about AC SERVO brake.
you can use the X-enable to activate BREAK
if you got enopf pins you can do at all axis
if you got enopf pins you can do at all axis
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20 Mar 2019 13:41 #129062
by thang
Replied by thang on topic A small question about AC SERVO brake.
I mean i turned servo on, but i still want to keep brake. And i will release brake when i control motor. Is this the way everyone use electromagnetic brake or do i have to release brake right after servo on?
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20 Mar 2019 14:17 #129069
by bevins
I release the brake on my VMC Z with servo on and a delay before servo off. If I dont have brake on my Z it will drop to the table. If I apply the brake same time the servo gets turned off, the Z will drop an inch until the brake gets turned on.
Replied by bevins on topic A small question about AC SERVO brake.
I mean i turned servo on, but i still want to keep brake. And i will release brake when i control motor. Is this the way everyone use electromagnetic brake or do i have to release brake right after servo on?
I release the brake on my VMC Z with servo on and a delay before servo off. If I dont have brake on my Z it will drop to the table. If I apply the brake same time the servo gets turned off, the Z will drop an inch until the brake gets turned on.
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- Todd Zuercher
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20 Mar 2019 14:37 - 20 Mar 2019 14:39 #129070
by Todd Zuercher
Replied by Todd Zuercher on topic A small question about AC SERVO brake.
You can use a time-delay hal component to delay the disabling of the servo drive until after the brake has locked the axis and another to delay the disabling of the brake until after the servo is enabled.
There is an example here:
forum.linuxcnc.org/24-hal-components/316...achine-on-off-button
There is an example here:
forum.linuxcnc.org/24-hal-components/316...achine-on-off-button
Last edit: 20 Mar 2019 14:39 by Todd Zuercher.
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21 Mar 2019 13:43 #129167
by andypugh
Replied by andypugh on topic A small question about AC SERVO brake.
You might want to consider disabling the PID (or some aspects of the PID) while the brake is enabled.
If there is any offset between commanded and actual with the PID on and the I term active then there is a risk of I-term windup and a lurch when the brake is disabled.
You could use a mux2 in the HAL file to switch between two values of pid.N.maxerrorI
linuxcnc.org/docs/2.7/html/man/man9/pid.9.html
If there is any offset between commanded and actual with the PID on and the I term active then there is a risk of I-term windup and a lurch when the brake is disabled.
You could use a mux2 in the HAL file to switch between two values of pid.N.maxerrorI
linuxcnc.org/docs/2.7/html/man/man9/pid.9.html
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