Brother TC-211

Thats exactly what i was saying , but if you dont have 24v availlable then the brake will not work in any case
the only difference was i did it in hardware and not as code , one relay with 2 pairs of contacts one for the servo' and the other for the brake

Andy , by the picture it did not appear to be the sprung type , however it would appear by reading the OP does not have 24v Available , we need clarification
perhaps see if the op can turn the shaft at the coupler in the picture , would give us a start point i think

I have 24 volts at my 7i77. On my servo the most I have on the control side is 10 volts. When the brake is energized it turns freely. When not energized it locks up.

ok thats good to know , so you need to supply power to the Brake to disable it , i would suggest that you check as i would think that the actual brake is operated by a relay and not directly
so wire the brake relay between 24v and a gpio pin on the 7i77. and use the delay code that Andy posted to delay release for a second or 2 to allow the servo amp to stabilise and hold
you may need to adjust the delays once you have it working

andypugh wrote:

Normally the brakes seem to be sprung "on" so that with no power the axis is locked, and it is actively unlocked when the motor is powered up and ready to use it.

That's standard. It's that way so that if power goes out, you don't have your head falling and crashing into the table.

Ok I'm a little lost again.

Here is my z axis hal


#*******************
# AXIS Z
#*******************

setp pid.z.Pgain [AXIS_2]P
setp pid.z.Igain [AXIS_2]I
setp pid.z.Dgain [AXIS_2]D
setp pid.z.bias [AXIS_2]BIAS
setp pid.z.FF0 [AXIS_2]FF0
setp pid.z.FF1 [AXIS_2]FF1
setp pid.z.FF2 [AXIS_2]FF2
setp pid.z.deadband [AXIS_2]DEADBAND
setp pid.z.maxoutput [AXIS_2]MAX_OUTPUT

net z-index-enable <=> pid.z.index-enable
net z-enable => pid.z.enable
net z-output => pid.z.output
net z-pos-cmd => pid.z.command
net z-vel-fb => pid.z.feedback-deriv
net z-pos-fb => pid.z.feedback

# ---PWM Generator signals/setup---

setp hm2_5i25.0.7i77.0.1.analogout0-scalemax [AXIS_2]OUTPUT_SCALE
setp hm2_5i25.0.7i77.0.1.analogout0-minlim [AXIS_2]OUTPUT_MIN_LIMIT
setp hm2_5i25.0.7i77.0.1.analogout0-maxlim [AXIS_2]OUTPUT_MAX_LIMIT

net z-output => hm2_5i25.0.7i77.0.1.analogout0
net z-pos-cmd axis.2.motor-pos-cmd
net z-enable axis.2.amp-enable-out

# ---Encoder feedback signals/setup---

setp hm2_5i25.0.encoder.00.counter-mode 0
setp hm2_5i25.0.encoder.00.filter 1
setp hm2_5i25.0.encoder.00.index-invert 0
setp hm2_5i25.0.encoder.00.index-mask 0
setp hm2_5i25.0.encoder.00.index-mask-invert 0
setp hm2_5i25.0.encoder.00.scale [AXIS_2]ENCODER_SCALE

net z-pos-fb <= hm2_5i25.0.encoder.00.position
net z-vel-fb <= hm2_5i25.0.encoder.00.velocity
net z-pos-fb => axis.2.motor-pos-fb
net z-index-enable axis.2.index-enable <=> hm2_5i25.0.encoder.00.index-enable
net z-pos-rawcounts <= hm2_5i25.0.encoder.00.rawcounts

# ---setup home / limit switch signals---

net home-z => axis.2.home-sw-in
net min-z => axis.2.neg-lim-sw-in
net max-z => axis.2.pos-lim-sw-in



And how it is wired off of the servo driver to the 7i77 board


CN8-10 A TB3-1
CN8-9 /A TB3-2
CN8-12 B TB3-4
CN8-11 /B TB3-5
CN8-17 Z TB3-7
CN8-13 /Z TB3-8

ANALOG VELOCITY COMMAND

CN8-1 AOUT TB5-4
CN8-2 GND TB5-3

DRIVE ENABLE

CN8-15 ENA+ TB5-2
CN8-16 ENA- TB5-1


So adding the line of code from before

net zenable hm2_5i25.0.7i77.0.output-03


output 3 would actualy be output 2 ?????

and where would I wire the relay connections to on the 7i77 board ????
Would that be tb8 pin 20 for output 3

I'm really lost here



Mesa pdf for 7i77

yes output pin 3 is pin 20 on TB8 , the confusion is that the pins start at 0 and not 1
so yes it can be confusing at first

2 have 2 banks of inputs and outputs on tb8 and tb 7
the first 16 pins are inputs and the last 8 are outputs

so your relay ( 24v) would go from your 24v + to the 7i77 TB8 PIN 20
and that your field voltage is is 24v TB2 pin 1 and ground pin 8