Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 115)

Load Initial Configuration Values
Chapter 7
7-29
Record initial Output for Minimum values on corresponding worksheets.
Selected Velocity Valve, Output for Maximum
(FCC48, SCC48, TCC48, INC48, FOC48, SOC48, TOC48, OSC48, EAC48, ERC48)
The QDC module uses this word with the Maximum Velocity Control
Limit (word 46) above. Enter the %-signal output that the QDC module
uses to drive the selected velocity valve for maximum profile velocity.
The QDC module expects a velocity equal to word 46 above when setting
the selected velocity valve to this percentage output.
The QDC module uses this setpoint to drive the selected velocity valve
when attempting to attain maximum ram (screw), clamp, or ejector
velocity. It should drive the selected velocity valve to a spool position that
provides full hydraulic flow.
Determine Output for Maximum values as follows:
9999 (100%) for uni-directional direct acting valves
0 (0%) or 9999 (100%) for bi-directional valves depending on direction
0 (0%) for uni-directional reverse acting valves
If your selected
velocity valve is:
Then the value in word 48
should be:
And during the profile, the QDC
module does NOT drive the valve
with a % output:
Direct Acting greater than the value in word 47 greater than word 48
Reverse Acting less than the value in word 47 less than word 48
Record initial Output for Maximum values on corresponding worksheets.
Important: Valve spanning procedures in chapter 9 require these initial
velocity control limits. For additional information, refer to section 3 of
the Plastic Molding Module Reference Manual (publication 1771-6.5.88).
Profile Gain Constants
(FCC49Ć53, SCC49Ć53, TCC49Ć53, LPC49Ć51, INC49Ć53, PKC49Ć51, HDC49Ć51,
PLC49Ć51, FOC49Ć53, SOC49Ć53, TOC49Ć53, OSC49Ć53, EAC49Ć53, ERC49Ć53)
The QDC module’s PID and velocity feedforward (VelFF) algorithms are
different from classic PID and VelFF algorithms. QDC module algorithms
are sensitive to changes in load (not changes in setpoint) because the QDC
module must respond to a system that is undergoing constant load changes
when hydraulic fluid is introduced into or relieved from the hydraulic
circuit. The algorithm gain constants are typically lower than those used to
control a process that reacts to setpoints changes.
We recorded all profile gain constants on corresponding worksheets.
Set Profile Gain Constants,
PressureĆAlarm Setpoints,
and Watchdog Timer
Presets