Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 179)

Tune Your Machine
Chapter 10
10-6
If: Then:
Observed actuals are consistently well below
profile setpoints
Increase proportional term(s)
Observed actuals are consistently well above
profile setpoints
Decrease proportional term(s)
Excessive hammering and vibration is
observed in the cylinder's hydraulic lines
Decrease proportional term(s)
Important: Each change to a tuning constant requires you to download
your changes to the QDC module. Refer to the Download Procedure
outlined in chapter 4.
Repeat the profile(s) cycles after each change to the proportional term(s)
until observed actuals are close to setpoints without hammering and
vibration in the controlling cylinder’s hydraulic lines.
Without modifying the proportional term(s) determined by the above
procedure, slowly begin increasing the appropriate integral term(s) while
running machine cycles until the observed profile pressure actuals are
overshooting the profile setpoints. Now decrease the integral term(s) until
the overshoot is no longer observed.
If you cannot make your observed pressures actuals match your entered
setpoints, verify your Unselected Valve Set-output Values are correct for
your application (Refer to chapter 7 and the discussion later in this
chapter).
Tune Pressure Loops with an Oscilloscope
Before you begin tuning your pressure loops, confirm the following:
Pressure vs. position is selected
Closed-loop is selected
ERC is disabled
ERC values have been reset
Ramping is disabled
All setpoint changes have been download to the QDC module
ATTENTION: Prior to running clamp profiles, refer to chapter
8 to verify that the appropriate Low Pressure Close Zone
Overrun or Open Slow Zone Overrun setpoints and bit
selections are entered properly and downloaded to the QDC
module. Do this to minimize the possibility of mold or machine
damage.