Rockwell Automation 1771-QDC, D17716.5.85(Passport) MNL. PLASTIC MOLDING MODULE - Manual (Page 137)

Span Your Valves
Chapter 9
9-20
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 subsection Span Your Plastication Pressure
Valve below if you have information from molding machine OEMs or
hydraulic valve manufacturers on spanning the working range of valves. If
available for your machine’s plastication pressure valve(s), enter valve
spanning values into pressure control limits PLC41-44 and proceed to Test
Valve Linearity. First confirm your critical values.
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
7ĆD
(chapter 7)
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 Minimum
Selected Pressure Valve, Output for Maximum
PLC41 = 0
PLC42 = max attainable backpressure
PLC43 = your value
PLC44 = your value
N44:397
N44:398
N44:399
N44:400
8ĆC Backpressure vs Position algorithm PPC03ĆB01 = B00 = 0 B38/480Ć481
(chapter 8) 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) is disabled 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.
Span Your Plastication
Pressure Valve