Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 203)

Span Your Valves
Chapter 9
9-37
We recommend that you span your plastication pressure valve for optimum
plastication performance in four parts:
Confirm critical values
Span your plastication pressure valve
Test valve linearity with a plastication backpressure vs. position profile
Set the profile pressure alarm
Important: You may omit the procedure Span your plastication pressure
valve in this section if the recorded valve spanning data from the
manufacturer in pressure control limits PLC41-44 (chapter 7) are adequate
for your application.
Confirm Critical Values
Important: Confirm that all entries you made for configuration values
(chapter 7) and profile values (chapter 8) are as follows:
On Worksheet Confirm Your Configuration With These Words or Bits ProĆSet Addr
7ĆH QDC module output to which you connected
your plastication pressure control valve
PLC02ĆB06, B05, B04 B38/404Ć406
SetĆoutput values for unselected valves PLC09Ć12 = your values N44:365Ć368
All ramping is disabled with zero ramp rates PLC17Ć20 = 0
PLC25Ć28 = 0
N44:373Ć376
N44:381Ć384
EndĆofĆprofile SetĆoutput values PLC33Ć36 for zero output N44:389Ć392
Pressure limits:
Minimum Pressure Control Limit
Maximum Pressure Control Limit
Selected Pressure Valve, Output for Min
Selected Pressure Valve, Output for Max
PLC41 = 0
PLC42 = max attainable backpressure
PLC43 = your value
PLC44 = your value
N44:397
N44:398
N44:399
N44:400
8ĆD Backpressure vs Position algorithm PPC03ĆB00 = 0 B38/480
Logical bridge to stop and set outputs before
postĆdecompression
PPC03ĆB08 = 1 B38/488
OpenĆloop control PPC04ĆB01 = B00 = 1 B38/496, 497
Expert Response Compensation (ERC) = Off PPC04ĆB09 = B08 = 1 B38/504, 505
Backpressure setpoints PPC10,14, 18, 22, 26, 30, 34, 38, 42,
46, 50 all equal to max desired
backpressure
start @ N44:426
end @ N44:466
Position setpoints PPC11,15,19,23,27,31,35,39,43,47
equal segments over shot size
start @ N44:427
end @ N44:463
Shot size PPC62 = typical for your machine N44:478
If these are not your current values, we suggest that you correct them now
and download them using the download procedure discussed in chapter 4.
PLC Profile -
Pressure Valve