Trying to get rid of spikes, see image 8 here:
https://sites.google.com/site/bmklawt/home/pid-tuning
See the jitter here: http://www.youtube.com/user/bmklawt
>Probably not the root cause of the problem, but you might try commenting
>out all the backlash statements in your ini file.
<
Tried this, no change
<
>OK, well, this is looking like there is a problem in the servo amps.
>Maybe
you need to check the + and - 15 Volts, or whatever the servo amps use
>as the supply for their op-amps. Capacitors may have
deteriorated and there is >noise on these supplies..
>
I checked this it has +15 volts and -15.2 volts, I don't know how to check for
noise
<
>Possibly you have grounded a circuit that should not be grounded to the
>>machine's common ground.
>
Grounding
problem has been mentioned a lot, I always assumed ground was ground,
everything in the control is grounded to the chassis. It is pretty much
as it was originally. I have a crude schematic here, maybe someone can find the
problem: https://sites.google.com/site/bmklawt/home/control-schematic
>
>Another
thought is that the logic signal that enables the servo amps is not
being >held at the right voltage, so the servo amps are right on the
edge of >enabling/disabling. This can cause a transient every time
the amp enables that >causes it to jump..
>
How would I check this?
>
>polarity of the signals is important. The command input "SIG" is on J1 Pin
>2.
>The
signal common, for tach, command and anything else is J1 Pin 4. J1 Pin
4 >needs to be connected to the ground of the DAC board.
>
Well I am sure this is right if it is backwards the servos run away
>
>If the connections are right, then I'd suggest running a big ground wire from
>the >servo amp chassis to the PPMC.
>
Did this, no change
>
>On the power supply that feeds the amps, is its output common grounded
>to something? And does the motor return line come back directly to the
>power supply common, without connecting to anything else along the way?
>
Well there is two power supplies going to the amps so I am
confused, please see the schematic here
https://sites.google.com/site/bmklawt/home/control-schematic
I don't know were the motor return line is
>
Your help is greatly appreciate
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