Suddenly spindle servo stopped and now only turns in one direction

Hello,
I'm using a JMC 1000w Servo motor as a spindle servo with the JASD15002-20B controller from JMC for a year now.
It runs up to max rpm and down to 50rpm (Milling, rigid tapping, ...) without a problem

shop.cnc-technics.de/Integrated-Servo-Mo...-36.html?language=de

A few days ago while a milling job the servo stopped suddenly. Maybe overload or something else, i don't know. 
After that the servo only turns on (run) when i run the spindle with 2500 rpm in linuxcnc, in the reverse direction the servo doesn't turn.

I can run the servo directly (manual) on the controller with every rpm, in normal or reverse direction.

Can that be a linuxcnc or a mesa card problem?
I didin't changed any parameter in linuxcnc.

Many thanks!
BR Anton

How are the spindle speed and direction controlled?

Hello,
thanks for the reply.

The spindle is controlled throu pos and dir of the mesa card.
I have a belt drive with 1:1,64 ratio
here is my Spindle section .ini:


[SPINDLE_0]
MAX_VELOCITY = 8000
# MAX_VEL = Umdrehungen geteilt durch 60 8235/60 = 137.254901 (8235U ist die Übersetung bei 5000U 56 Zähne zu 34 Zähnen)
MAX_ACCELERATION = 2000
# The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION
# If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger.
STEPGEN_MAXVEL = 10000
STEPGEN_MAXACCEL = 2500
P = 5000.0
I = 0.0
D = 0.0
FF0 = 0.0
FF1 = 1.0
FF2 = 0.0
BIAS = 0.0
DEADBAND = 0.0
MAX_OUTPUT = 500
# these are in nanoseconds
DIRSETUP   = 500
DIRHOLD    = 500
STEPLEN    = 500
STEPSPACE  = 500
STEP_SCALE = 6071.428571428571
# STEP_SCALE = 10000 (Encoderzahl pro Umdrehung) / Übersetzung (56Z zu 34Z = 1,647058823529412)

#---Encoder etc einrichten für orient----
OUTPUT_SCALE    = 101.1904761904762
#Berechnung: 10000/60 (Stepscale)Encoderimpulse pro Umdrehung durch 60 = Impulse pro Sek
ENCODER_SCALE   = 6071.428571428571
ACCELERATION    = 2000
MAX_ERROR        = 0.2
OFF_DELAY       = 1.5


I can controll the speed also throu the gmocappy Spindle speed beam but the spindle starts only at approx 2500rpm then i can go down with the beam % to nearly 1 rpm but the spindle speed on gmocappy shows ~2100.
Rotate in reverse is not possible.

the strange thing is, that before the milling job everything worked flawless.

Many thanks!
BR
Anton

 

Those PID settings look fairly crazy to me...

Can you post the hal file?

Is encoder feedback being used?

For a normal velocity mode step/dir driven spindle (open loop) I would expect
PID values of all 0 except FF0=1 (and a low P value)

Also you might try doubling the step times, 500 ns is quite short for most hardware

Hello Peter,
thanks!

Here is my hal file.

Yes i use encoder feedback for rigit tapping (index with sensor on the spindle)

BR
Anton

OK so that's a complex spindle configuration with position mode for spindle orientation

So if this did work and nothing has changed settings wise, it might
be a good ides to verify the step/dir signals. SInce you say the spindle
will not run in reverse, I would verify that the DIR signal from the 7I76E
is valid at the drive connector.

I would check the drive firts, it all points to the drive stopping due to power surge or overload and reseting settings.

Yeah, I also had that feeling (that perhaps drive settings were lost somehow)

Hello, Thanks for the inputs!

now I'm a little bit nearer the finish.

I also think that the drive settings are gone. Before i get 1rpm - 8000rpm with the setting in the .ini above.

Now when i go up with the step times (850) the servo is working, but i get an error message:
maxvel is too big for current step timings & position-scale, clipping to max possible
and i didn't get the max speed out of the motor. Only approx. 3500rpm

Thanks!

best regards
Anton
 

anton610 wrote:

Now when i go up with the step times (850) the servo is working, but i get an error message:
maxvel is too big for current step timings & position-scale, clipping to max possible

That's LinuxCNC settings, not drive settings, though.