Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 206)

Span Your Valves
Chapter 9
9-49
Important: If the pressure during clamp open slow differs from that
during clamp open fast, complete the calculations for both pressures. Be
sure to record words with correct prefixes:
open slow values with the OSC prefix
clamp open fast values with FOC, SOC and TOC prefixes
3. Convert the minimum and maximum flow obtained from your flow
curve to clamp cylinder velocity. This is done by:
Clamp Cylinder Velocity (in/sec) =
Flow (in 3 /sec)
Area (in 2 )
- where area is the inside diameter of the cylinder. This area may
be different for the rod and piston ends of the cylinder:
Area for Rod End =
I.D. of cylinder
2
Rod diameter
2
π
2 2
Area (no Rod) =
I.D. of cylinder
2
π
2
π
- Flow assumes no restrictions on the exhaust port of the cylinder.
4. Enter the minimum velocity (usually 0) from these calculations into
FOC45, SOC45, TOC45, and OSC45. Enter the maximum velocity
into FOC46, SOC46, TOC46, and OSC46.
5. Divide the voltage/current corresponding to minimum velocity by the
full range of valve input signal to determine the percent signal output
for minimum. Enter this value into FOC47, SOC47, TOC47, OSC47.
6. Divide the voltage/current corresponding to maximum velocity by the
full range of valve input signal to determine the percent signal output
for maximum. Enter this value into FOC48, SOC48, TOC48, OSC48.
7. Download changes to the QDC module.
Important: If downloading from your programming terminal, download
FOC, SOC, TOC, OSC, and OPC in that order (chapter 4).
To download Set B21/
FOC 16
SOC 17
TOC 18
OSC 19
OPC 20