Rockwell Automation 1771-QDC, D17716.5.85(Passport) MNL. PLASTIC MOLDING MODULE - Manual (Page 88)

Load Initial Configuration Values
Chapter 7
7-19
Setting pressure control limits lets you span your selected valve outputs for
effective control with either direct- or reverse-acting valves. Your machine
manufacturer typically provides you with values to configure these limits.
Minimum Ram (Screw) Pressure Control Limit
(INC41, PKC41, HDC41, and PLC41)
The value in this word corresponds to the minimum controllable ram
(screw) pressure during the respective profile. The QDC module uses this
word with Selected Pressure Valve, Output for Minimum (word 43) below.
The QDC module expects this pressure when setting the selected ram
(screw) pressure valve to the percentage output you enter in word 43.
We recorded zero on corresponding worksheets.
Maximum Ram (Screw) Pressure Control Limit
(INC42, PKC42, HDC42, and PLC42)
The value in this word corresponds to the maximum controllable ram
(screw) pressure during the respective profile. The QDC module uses this
word with Selected Pressure Valve, Output for Maximum (word 44) below.
The QDC expects this pressure when setting the selected ram (screw)
pressure valve to the percentage output you enter in word 44.
Record an initial control limit equal to the maximum pressure available
through the selected ram (screw) pressure valve during the profile.
Selected Ram (Screw) Pressure Valve, Output for Minimum
(INC43, PKC43, HDC43, and PLC43)
The QDC module uses this word with Minimum Pressure Control Limit
(word 41) above. Enter the %-signal output that the QDC module uses to
drive the selected ram (screw) pressure valve for minimum profile
pressure. The QDC module expects a pressure equal to word 41 when
setting the selected ram (screw) pressure valve to this percentage output.
Determine Output for Minimum values as follows:
0 (0%) for uni-directional direct acting valves
5000 (50%) for bi-directional valves
9999 (100%) for uni-directional reverse acting valves
If your selected
pressure valve is:
Then the value in
word 43 should be
And during the profile, the QDC module
does NOT drive the valve with a % output
Direct acting less than value in word 44 less than value in word 43
Reverse acting greater than value in word 44 greater than value in word 43
Record initial Output for Minimum values on corresponding worksheets.
Set Pressure Control Limits