Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 120)

Load Initial Configuration Values
Chapter 7
7-39
Profile Gain Constants
(FCC49Ć53, SCC49Ć53, TCC49Ć53, LPC49Ć51, INC49Ć53, PKC49Ć51, HDC49Ć51,
PLC49Ć51, FOC49Ć53, SOC49Ć53, TOC49Ć53, OSC49Ć53)
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 entered all profile gain constants on corresponding worksheets.
Profile PressureĆAlarm Setpoints
(FCC57, SCC57, TCC57, LPC57, INC57, PKC57, HDC57, PLC57, FOC57, SOC57,
TOC57, OSC57)
The QDC module compares real-time pressure against these entries when
executing the appropriate profile. The QDC module sets a corresponding
alarm bit any time pressure equals or exceeds these entries during the
respective profile. A zero entry inhibits each respective alarm.
We entered zero for each alarm setpoint on corresponding worksheets.
Watchdog Timer Presets
(FCC08, SCC08, TCC08, LPC07Ć08, PLC08, FOC08, SOC08, TOC08, OSC08)
Use the watchdog timer to signal an alarm if the associated profile takes
longer than expected. To inhibit each timer, enter a preset of zero.
When the QDC module starts a profile, it:
starts the associated internal timer
stops the timer, reports execution time, and resets the accumulated value
to zero when it completes the profile
sets an alarm bit if the accumulated value exceeds this preset
We entered zero on corresponding worksheets to inhibit all watchdogs.
The closed-loop tuning procedures in chapter 10 require these initial
values. In that chapter, we help you select the correct final values required
by your application. For additional information, refer to Section 3 of the
Plastic Molding Module Reference Manual (publication 1771-6.5.88).
Set Profile Gain Constants,
PressureĆAlarm Setpoints,
and Watchdog Timer
Presets