Spindle brake time question

[jtroedel8487]

I got my spindle brake wired up using an air solenoid valve and was hoping someone could advise me on how to set the time delay between when the vfc shuts the spindle off and when the break engages. I am using an acorn board running the latest version of cnc 12. I found parameter 990 and from what I can tell it only controls the time delay between break disengaging and vfc start. Thanks for any help!

[martyscncgarage]

VFC? You mean VFD (Variable Frequency Drive)
What kind of machine? Bridgeport? Big picture please (and pictures!)
What is the end result on how you want to use the spindle brake?
Normally the VFD is used to decelerate the spindle to a stop.

We can't guess as to what you have, what you want to do. We can't "SEE" what you "SEE"
More information will get you better information.
Marty

[Allin1Chris]

The SpindleBrakeTimer (Parameter 990) is a delay when the spindle is started so the VFD does not start prematurely if the brake takes a bit of time to release once the output is on. It does not add a timer to the end when you turn off the spindle. Usually when you want the spindle to stop you want it to stop now.

However, you can easily add a timer to your PLC if needed, here is what i added to delay the Release output.

SpindleOff_PD IS PD82

SpindleBrakeDelayTimer IS T33

;---------------------------Spindle Brake Release------------------------------
IF True THEN SpindleBrakeDelayTimer = SV_MACHINE_PARAMETER_700

;Delay SpindleBrake when VFD Turns Off
IF !SpindleEnableOut_M THEN (SpindleOff_PD)

IF SpindleOFF_PD THEN SET SpindleBrakeDelayTimer
IF SpindleEnableOut_M THEN RST SpindleBrakeDelayTimer

; Turn off SpindleBrakeRelease if SpindleBrake is enabled and SpinBrakeMode_M is on
; and Spindle is not running
IF !SpindleBrakeDisabled_M && SpindleBrakeDelayTimer && ;Added SpindleBrakeDelayTimer to this logic to delay the RST of SpindleBrakeRelease
((StandardSpindleStage && !SpindleEnableOut_M && !SpinBrakeOn_M) ||
(G540SpindleStage && (!SpindleForward_M && !SpindleReverse_M) && !SpinBrakeOn_M) ||
(SpinBrakeOff_M && !((StandardSpindleStage && SpindleEnableOut_M) ||
(G540SpindleStage && (SpindleForward_M || SpindleReverse_M)))))
THEN RST SpindleBrakeRelease, RST SpindleBrakeDelayTimer

When the SpindleEnableOut_M is turned off it will start the timer and will turn off SpindleBrakeRelease after the timer. You can set the timer for this particular code by changing parameter 700 (its in ms) so a 500 would be 500ms. You will want to add this in your acorn_mill_plc.src file in your cncm directory and in wizard set option to customplc (this will prohibit further I/O changes in the wizard however)

[jtroedel8487]

Thank you so much! This is exactly what I needed!