Rockwell Automation 1771-QDC, D17716.5.85(Passport) MNL. PLASTIC MOLDING MODULE - Manual (Page 130)

Span Your Valves
Chapter 9
9-13
We recommend that you span your pack and hold pressure valves for
optimum pressure performance in four parts:
Confirm critical values
Span your pack and hold pressure valves
Test valve linearity with a pressure vs. time profile
Set profile pressure alarms
Important: You may omit the subsection Span Your Pack and Hold
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 pack and hold pressure valve, enter
valve spanning values into pressure control limits PKC41-44 for Pack and
HDC41-44 for Hold, and proceed to Test Valve Linearity.
Important: If your machine hydraulics for pack and hold are identical to
those for injection, you may use your injection pressure valve spanning
parameters for pack and hold. If so, enter your values for INC41-44 into
PKC41-44 and into HDC41-44, and skip to Test Valve Linearity.
Important: If your machine controls cavity pressure during pack and hold,
follow the procedure for ram (screw) pressure and transfer the values to
PKC45-48 and HDC45-48 for cavity pressure. First confirm 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
for Pack Pressure
ProĆSet Addr
7ĆB
(chapter 7)
QDC module output to which you connected your
pressure control valve
PKC02ĆB06, B05, B04 B38/148Ć150
SetĆoutput values for unselected valves PKC09Ć12 = your values N44:125Ć128
All ramping is disabled with zero ramp rates PKC17Ć20 = 0
PKC25Ć28 = 0
N44:133Ć136
N44:141Ć144
Pressure limits:
Minimum Pressure Control Limit
Maximum Pressure Control Limit
Selected Pressure Valve, Output for Minimum
Selected Pressure Valve, Output for Maximum
PKC41 = 0
PKC42 = system pressure
PKC43 = your value
PKC44 = your value
N44:157
N44:158
N44:159
N44:160
Span Your Pack and Hold
Pressure Valves