Advanced Search

tommylight wrote:

Are the motors brushed DC or brushless, or steppers?
If brushed DC there are also "extreme limits" that also cut power to drives.

Well I’m getting rid of anything and everything VFD related here lol.  Its a 100% stepper system.  The drives are cheap all though the new spindle drive is pretty nice just is difficult to understand how to configure it and all.  I’m pretty sure the spindle drive has some kind of limits functionality that can be programed into it, maybe even an estop command can be sent to it.  As far the other drives they only take power and step/dir input.  

I’m staring to think go with kill all drive drives power including spindle drive but leave the control board running and also get it to receive the estop signal.

Also do you know of any good 220v relays that are din mountable that don’t hum loudly when they are on? 

Thanks

In general, never ever switch of the DC side of things.
Leaving the controller on even on E-stop is a good advice as you can check what went wrong.
E-stop should kill power to drives and spindle, and must be considered as the last resort in case something goes wrong.
Are the motors brushed DC or brushless, or steppers?
If brushed DC there are also "extreme limits" that also cut power to drives.

pippin88 wrote:

The ideal setup is estop kills the servo drive motor power input, and spindle power input.
Most servo drives have two power inputs: control power, and motor power

Estop circuit should signal to Linuxcnc that estop has occurred.

Most servo drives will have a digital input that can be configured as estop/fault

 

Ok well on the new spindle drive that I’m working with it has something in the manual that talks about estop signal but there’s no documentation on how to use it.  The other drives for the stepper motors to the axis's XYZ have no such thing.  I really think my machine was originally so old and cheap that the stepper drives didn’t have a control power option built in when manufactured, so it was designed to kill the control board all together instead.  I might have to do the same thing here with this estop or do something at least with figuring out how to signal the spindle drive to receive the estop alert then on the control board signal it the estop function but not completely kill the power to it?

Sorry to dig up an old thread but I have fried a 7I76 board due to connecting the end stop plug into the spindle connector and shoving 24V where it was never supposed to go!

Mine is a rev C board and PTC4 is badly scorched but still seems to be working. CR17 went short circuit and was burnt to a crisp which in some ways may have been a saving grace.

The FPGA is working and the voltage rails look good but the stepper buffers seem to be damaged.

I know I need to order SSOP versions of the 74ACT541 and 74ACT540 but what values are the PPTC and CR17? What else may have gone?

Finally is the schematic for the 7i76 available?