PnCConf spindle max rpm limit issue
27 Mar 2020 01:36 #161652
by cmorley
Hmm well you didn't mention you were using 2 ranges for spindle control.
the range scaling is all screwed up. seems if pncconf isn't calculating it correctly.
Are you actually using 2 gear ratios?
setp ratio_select.in00 0.000167 is not right it should be 1
You haven't connect anything to gear-select-a, o the other ration won't come into affect.
How this works is the requested absolute spindle speed is multiplied by the gear scaling ration then fed to the analog output.
The analog output adds it's own scaling and limts.
What we want is 24000 (requested rpm) x 1 (gear ratio scaling ) x analog scaling = 10volt output
analog scaling works like thus:
[SPINDLE_9]OUTPUT_SCALE = what input RPM gives 10 volt output - so you want 24000 rpm request to be 10 volts - so 24000 is the scale
[SPINDLE_9]OUTPUT_MAX_LIMIT = the maximum input RPM allowed; the component will not increase voltage past this number- so 24000
[SPINDLE_9]OUTPUT_MIN_LIMIT = the minimum input RPM allowed; the component will not decrease voltage under this number - so 0
Of course you may need to tweak the OUTPUT_SCALE a bit to make up for losses/nonlinear output etc but it should be close to this.
Chris
Replied by cmorley on topic PnCConf spindle max rpm limit issue
Here are my config files. Ps. Don't worry about PID settings in XYZ axes I will set it later.
Hmm well you didn't mention you were using 2 ranges for spindle control.
the range scaling is all screwed up. seems if pncconf isn't calculating it correctly.
Are you actually using 2 gear ratios?
#*******************
# SPINDLE S
#*******************
setp pid.s.Pgain [SPINDLE_9]P
setp pid.s.Igain [SPINDLE_9]I
setp pid.s.Dgain [SPINDLE_9]D
setp pid.s.bias [SPINDLE_9]BIAS
setp pid.s.FF0 [SPINDLE_9]FF0
setp pid.s.FF1 [SPINDLE_9]FF1
setp pid.s.FF2 [SPINDLE_9]FF2
setp pid.s.deadband [SPINDLE_9]DEADBAND
net ratio_select.out pid.s.maxoutput
setp pid.s.error-previous-target true
setp pid.s.maxerror .0005
net spindle-index-enable <=> pid.s.index-enable
net spindle-enable => pid.s.enable
net spindle-vel-cmd-rpm-abs => pid.s.command
net spindle-vel-fb-rpm-abs => pid.s.feedback
net spindle-pid-out pid.s.output => scale.gear.in
net gear-ratio ratio_select.out-f => scale.gear.gain
setp ratio_select.in00 0.000167
setp ratio_select.in01 100.000000
net gear-select-a => ratio_select.sel0
net spindle-output <= scale.gear.outsetp ratio_select.in00 0.000167 is not right it should be 1
You haven't connect anything to gear-select-a, o the other ration won't come into affect.
How this works is the requested absolute spindle speed is multiplied by the gear scaling ration then fed to the analog output.
The analog output adds it's own scaling and limts.
What we want is 24000 (requested rpm) x 1 (gear ratio scaling ) x analog scaling = 10volt output
analog scaling works like thus:
[SPINDLE_9]OUTPUT_SCALE = what input RPM gives 10 volt output - so you want 24000 rpm request to be 10 volts - so 24000 is the scale
[SPINDLE_9]OUTPUT_MAX_LIMIT = the maximum input RPM allowed; the component will not increase voltage past this number- so 24000
[SPINDLE_9]OUTPUT_MIN_LIMIT = the minimum input RPM allowed; the component will not decrease voltage under this number - so 0
Of course you may need to tweak the OUTPUT_SCALE a bit to make up for losses/nonlinear output etc but it should be close to this.
Chris
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27 Mar 2020 06:26 #161681
by Dex64
Replied by Dex64 on topic PnCConf spindle max rpm limit issue
You're right 
I changed ratio setp ratio_select.in00 0.000167 to 1 and it helped..
Now It's work OK. Thank's for everybody for help !
I changed ratio setp ratio_select.in00 0.000167 to 1 and it helped..Now It's work OK. Thank's for everybody for help !
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