Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 178)

Tune Your Machine
Chapter 10
10-5
We assume the same objective in tuning a pressure loop utilizing a scope as
without it. Maximum control is desired without introducing so much gain
that the machine hydraulics hammer and wear.
If an oscilloscope is available, connect it to your selected clamp (ejector)
pressure control valve at this time and proceed to the section in this chapter
on Tuning pressure loops with an oscilloscope.
Tune pressure loops without 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.
Enter an operational profile representative of the movement characteristics
you desire for your production cycle. Zero the appropriate integral and
derivative term(s) associated with the profile(s), leaving the proportional
term(s) at the default settings you entered in chapter 7.
Run several cycles of the profile(s) while observing the profile actuals
returned in the appropriate status block. Also pay attention to the
hydraulic hoses leading to the cylinder being controlled (noting abnormal
flexing or pulsing).