Rockwell Automation 1771-QDC, D17716.5.85(Passport) MNL. PLASTIC MOLDING MODULE - Manual (Page 142)

Span Your Valves
Chapter 9
9-25
We recommend that you span your plastication RPM valve for optimum
plastication performance in three parts:
Confirm critical values
Span your plastication RPM control valve
Test valve linearity with a plastication RPM vs. time profile
Important: You may omit the subsection Span Your Plastication RPM
Control 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 RPM valve, enter valve
spanning values into RPM control limits PLC45-48 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 RPM control valve
PLC02ĆB02, B01, B00 B38/402Ć400
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
RPM limits:
Minimum RPM Control Limit
Maximum RPM Control Limit
Selected RPM Valve, Output for Min
Selected RPM Valve, Output for Max
PLC45 = 0
PLC46 = max attainable screw RPM
PLC47 = your value
PLC48 = your value
N44:401
N44:402
N44:403
N44:404
8ĆC
(chapter 8)
Logical bridge to stop and set outputs before
postĆdecompression
PPC03ĆB08 = 1 B38/488
OpenĆloop control PPC04ĆB03 = B02 = 1 B38/499, 498
Expert Response Compensation (ERC) = Off PPC04ĆB11 = B10 = 1 B38/507, 506
RPM setpoints PPC09,13, 17, 21, 25, 29, 33, 37, 41,
45, 49 all equal to 1/2 max screw RPM
start @ N44:425
end @ N44:465
Time setpoints PPC12,16,20,24,28,32,36,40,44,48
all equal to one second (100)
start @ N44:428
end @ N44:464
Shot size PPC62 = typical for your machine N44:478
Set New Values for the RPM vs. Time Profile
On Worksheet Set this Configuration With These Words or Bits ProĆSet Addr
8ĆC RPM vs Time algorithm PPC03ĆB01 = B00 = 1 B38/480Ć481
Download the PPC block using the download procedure from chapter 4.
Span Your Plastication
RPM Valve