PID Controller Start-up on Lee C312-155

[Jeff Maney]

Today I ran a pot on the Lee C312-155 DC mold using my new Mypin PID controller. SV=720 & PV varied 716 to 724 degrees! Using a Lee 4-20 pot, and this is the 3rd time I have ran this Lee mold.
Alloy was 11# COWW + 1.1# foundry type. Average weight was 155.5, Sd 0.25! Diameter of bands averaged 0.3116" I don't think I got the best data during the auto tune and I will run auto tune again the next time I cast. I was throwing all sprues & a few rejects back into the pot so this seems to be decent process control.
It was nice not to have to chase the Lee pot thermostat thru the run! I also noticed that with the constant alloy temperature I never had to vary my casting rate, got the mold off the hotplate and kept the same pace till the pot was empty!
I did notice that the few rejects I had did not have sharp corners on the boolit base, this makes me wonder if I needed to have SV a bit higher than 720 degrees with the aluminum mold? This is only the 3rd time I have ran an aluminum mold so I am still learning!

Jeff

[Jeff Maney]

On 4/14 I ran another pot on the Lee 312-155 mold. I ran auto tune again and the controller ran a very stable temperature when throwing sprues & a few rejects back in the pot. I wrote a small set-up instruction sheet that includes the parameters I copied from my controller. Excel parameter spreadsheet is (not) attached.

PS: System can't upload Excel file type! Email me and I will attach the spreadsheet to my reply.

Jeff

Set-up/Parameters
MyPin TD4-SNR-SSR PID Parameters
SV = 720 Degrees, Jeff Maney; MyPin TD4 Parameters 041614.xls; 04/16/2014
Hold Set > 3 seconds = Change Parameters
Hold <</M > 3 seconds = Change SV
Hold Set & <</M > 3 seconds = Start auto tune, 'green' AT/M LED flashing
#7 = -T/C 'Green wire'
#8 = + T/C 'Red wire'
#3 = - SSR #1 = 120 VAC (Hot)
#4 = +SSR #2 = 120 VAC (neutral)

Parameter Values (Lee 4-20 pot, 720 degrees SV)
AL1 = AL1 set range = 90.0
AO1 = AL1 mode = 2 (HI alarm)
AL2 = AL2 set range = 900
AO2 = AL2 Mode = 2 (HI alarm)
PVF = Range = 0.0
InP = T/C = "K" type
P = Proportional Band % Range = 2.1
I = Intergal time range = 116.0
d = derivative time range = 29.0
oVD = control = Heat
HyS = Control Hys. Range = 1.0
CtL = control mode = SSR
TrL = High Output Low = 0.0
TrH = High Output High = 100
bSL = control = PID
C-F = Temp Units = F
LCK = lock code = 000