z axis brake for router, all in one configuration

[tomj]

Retrofitting a Standard router with all in one. It has a 24vdc brake on the SEM z axis servo. Is it best practice to unbrake only when a z axis move is commanded or whenever power is supplied to the motors? I would think unbraking only on commanded z move would be easier on the motor- it probably weighs 45lbs+ & no counterbalance or air spring and a 5tpi pitch ballscrew driven 1:1 w/26lbin servo. I have a separate power supply wired to it thru out 9 com and out 9 no on AIO as shown in the installation manual schematic "allinoneDC braking motor circuit" What parameter do I change for unbrake when z axis move is commanded?
looks like the x and y axes also have brakes, but they are the brake off without power applied type (I guess that would be referred to as normally off?), and I don't think I'll need them (unless someone here recommends that- same servo motor but 1" pitch 4 lead screw driven 2:1), but if I would like to have those brakes brake whenever an axis is motionless what parameter would that be for x and y?
thanks
tom

[cncsnw]

There is no way to make the brake automatically release when a move is commanded, and be reapplied when movement stops, while leaving the servo enabled. If there were, it would be unreliable.

Just use it the way it is intended to be used: release on enable (SV_PC_POWER_AXIS_3).

[tomj]

OK makes sense to not have to cycle the brake all the time. I don't see where to enable this release on enable though. I couldn't find anything on braking after doing a text search on all the documentation on the Centroid site, and the only related info I was able to locate on the forum was this thread, which I take to mean that the capability is there but I did not see a parameter or anything on the control, I'm new to centroid and maybe I'm looking in the wrong place. I'm away from the shop but I think I have the standard mill PLC, here is the comment :

Spindle brake control on V2XT
Post by cncsnw » Tue Jan 21, 2020 9:38 am

Your PLC program includes:
CODE: SELECT ALL

ZBrakeRelease_O IS OUT9 ;SPDT Type
;...
;Brake Release
IF (SV_PC_POWER_AXIS_3) THEN (ZBrakeRelease_O) ;Turns on OUT9 for Z-axis brake

[cncsnw]

Maybe you could post a Report from your system.

Then we could see whether your PLC program for your system already has Z axis brake-release logic assigned to OUT9.

This type of feature is not determined by setting parameter values. It is determined by putting the desired logic in the PLC program.

[tomj]

Will do tomorrow. thanks

[martyscncgarage]

The premise of the Z axis brake, is
The brake is on all the time. It is released when:
the axis is commanded to move (Jog, home, MDI)

The brake stays released UNLESS:
Estop is pressed
The control sees a fault
Control is powered down.

So, the minute the Z axis is called to move, provided there is no fault,
Output 9 closes providing 24VDC from the separate power supply to the the brake and releasing it.

I find it odd that you say your X/Y axis have a brake. Please provide pictures of the motos and why you think they have a brake.
You should have provided pictures of the machine, motors, etc. We can not "SEE" what you see.
Please follow this post: viewtopic.php?f=20&t=383

ALWAYS provide a fresh report at the very least when asking for help. More information provided, the better the help will be.

Marty

[tomj]

I'll get a bunch of info posted on the whole project tomorrow. The x and y have brakes and also tachs I think, I need to look again in the am, I thought that was weird too.

[martyscncgarage]

I'll get a bunch of info posted on the whole project tomorrow. The x and y have brakes and also tachs I think, I need to look again in the am, I thought that was weird too.

Tachs come off, new line driver differential encoders go on....

[tomj]

The servo motors are all SEM Servo Dynamics MTS30M4-38 26lb/in 8.6A 3700 rpm 140v 47A with 2500 line 10000 count encoders AND brakes; z has a 24v 44lb/in brake that is applied when power to the brake leads is off AND a 7v per 1000 rpm tach (I can see in the end of the motor what I think is the tach, it looks to be integral to the motor and not removable like the encoders). The x and y motors also have the same encoders and they have wires that look the same as the brake wires on the z axis motor but the brake SPEC is not noted on the motor tag as it is on the z axis motor, and the motors can be easily turned so I'm assuming they do have brakes which only brake when power is applied to the brake leads. The Z motor is a bit taller as well. I have not applied brake power to any of the motors yet. I did test the encoder count as on the manual page 32 by rotating the motors (overcoming the z brake to do so for z). I'm working on photos/schematic and have attached the report.zip below so we can see if I have the PLC with the code needed to release the z brake and proceed. FYI the machine is almost identical to the example on the Centroid page here:

https://www.centroidcnc.com/cnc_router.htm

I have the table as x, gantry as y
thanks

[tomj]

Got an album together here:
https://photos.app.goo.gl/wFsjzoRc2vhWMeaq9
excuse the mess, I'll be tidying up the wires in bundles after its up and running. Still working on a schematic...would you by chance have an AllInOne as a solidworks electrical component file?