Rockwell Automation 1771-QDC, D17716.5.85(Passport) MNL. PLASTIC MOLDING MODULE User Manual

Page 145

Span Your Valves

Chapter 9

9-28

While maintaining this minimum RPM, observe the actual set-output
value in SYS41-44, (N40:193-196) that corresponds to your screw
RPM valve. Copy this value into PLC47 (N44:403), the Selected
RPM Valve, Output for Minimum.

Modify the value in DYC09-12 (N40:121-124) that corresponds to
the screw RPM valve in 5% steps while observing rising RPM in
SYS27 (N40:179). Stop adjusting it when the observed RPM no
longer increases with a change in the set-output value. Now the RPM
in SYS27 is the maximum obtainable RPM.

Copy the RPM observed in SYS27 (N40:179) into PLC46 (N44:402),
the Maximum RPM Control Limit.

10.

While maintaining this maximum RPM, observe the actual set-output
value in SYS41-44 (N40:193-196) that corresponds to your screw
RPM valve. Copy this value into PLC48 (N44:404), the Selected
RPM Valve, Output for Maximum.

11.

Disable set-output operation. Toggle DYC01-B08 (B34/392) to 0.

12.

Download your final values for PLC45-48 to the QDC module by
downloading the PLC and PPC blocks.

Important: If downloading from your programming terminal, download
PLC followed by PPC with download bits B21/13 and 14 (chapter 4).

Test Valve Linearity with an RPM vs. Time Plastication Profile

Confirm that your RPM setpoints are equal to 1/2 the maximum
attainable RPM in PPC09, 13, 17, 21, 25, 29, 33, 37, 41, 45, and 49
(in N44:425, 429, 433, 437, 441, 445, 449, 453, 457, 461, 465).

If not, correct them and download them to the QDC module.
For instructions, refer to chapter 4.

Manually jog your ram (screw) to a point near the mold-end position.

Run an RPM vs. time injection profile by toggling DYC02-B08
(B35/408) from 0 to 1 to 0. If you observe no screw rotation,
verify that:

- no ram (screw) overtravel alarms are set. The QDC module

inhibits plastication profiles if alarm bits SYS07-B00 through
SYS07-B05 are set.

- no programming error codes exist in SYS61 and SYS62.

The QDC module automatically runs the plastication profile until the
ram (screw) backs up to the 100% shot size position (PPC61 + 62).