Retrofitting a TOS FNG 32 NC

Analog servo systems REQUIRE a bit of drift when enabled and the input is at zero.
Do not try to tune that, never ever.
First, fix the wiring so that any joint error will disable the drives, this is also not negotiable.
A detailed guide on step by step wiring and checking is here:
forum.linuxcnc.org/10-advanced-configura...ning-detailed-how-to

tommylight wrote:

Analog servo systems REQUIRE a bit of drift when enabled and the input is at zero.
Do not try to tune that, never ever.
 

Can you explain or provide more information about why this is the case?

I would not say that its required, but analog servos almost always drift a bit.
If you zero the motion at one temperature, it may drift a bit when the temperature
changes. That said, small amounts of drift are unimportant as they will never
occur when LinuxCNC is closing the feedback loop, and the drives _MUST_ be disabled
when LinuxCNC is not in control (that is LinuxCNC must control the drive enables)

Hi Henk,
What kind of problem did you have when you tried to enable all of the enables at ones with your Maho?
I have XYZ enabled by the Mesa board, and the last one to enable the whole drive is currently permanently enabled.
I have a slowly drifting servomotor now when the XYZ enables if off. I want to rewire it so that the fourth enable also is through the Mesa. My first thought is to wire it the same as the others. IIRC Mesa has 4 enable switches that is switched on at the same time.

HI
ENA0 through 4 (5 in quantity) on the mesa 7i77 works together, they cannot be controlled individually. The last one is the spindle ENA and should be used for the spindle only.

What you want is for the axis enable pin (65 on the drive, one for each axis) is controlled by linuxcnc. In your hal file, this line "net x-enable => [HMOT](CARD0).7i77.0.1.analogena" switches on the ena signals on the mesa card, and this will only happen when linuxcnc is turned on and controlle the position PID loop...

Check the wiring that feeds pin/s 65.

the main power to the drive should be switched off when estop is pressed. the auxilary power should be on all the time, when the main isolator is on (pins 27, 28 and 28)

you can enable 63 and 64 by KA23 when estop is released, but there must be power on 27-29 before that.

hope this helps

HI
ENA0 through 4 (5 in quantity) on the mesa 7i77 works together, they cannot be controlled individually. The last one is the spindle ENA and should be used for the spindle only.

What you want is for the axis enable pin (65 on the drive, one for each axis) is controlled by linuxcnc. In your hal file, this line "net x-enable => [HMOT](CARD0).7i77.0.1.analogena" switches on the ena signals on the mesa card, and this will only happen when linuxcnc is turned on and controlle the position PID loop...

Check the wiring that feeds pin/s 65.

the main power to the drive should be switched off when estop is pressed. the auxilary power should be on all the time, when the main isolator is on (pins 27, 28 and 28)

you can enable 63 and 64 by KA23 when estop is released, but there must be power on 27-29 before that.

hope this helps