Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 143)

Span Your Clamp and Ejector Valves
Chapter 9
9-7
What You Have Accomplished
The valve spanning procedure you just completed has:
defined the range of pressure available during Low Pressure Close
informed the QDC module of the signal level needed to drive the
selected low pressure close valve for any requested open-loop pressure:
% of Signal Level Entered In: Drives the selected valve to produce:
LPC43 Pressure (usually 0) in LPC41
LPC44 Pressure in LPC42
Now, for all open-loop Low Pressure Close profiles, the QDC module:
drives the selected clamp pressure valve between the signal limits
imposed by LPC43 and LPC44
assumes a linear relationship between Low Pressure Close clamp
pressure and the signal output
Set Tonnage on Hydraulic Clamps and Hold Pressure on Toggle
Clamps
Once the clamp has completed Low Pressure Close, you have the ability to
use the Low Pressure Close End-of-Profile set output values to build
tonnage on your hydraulic clamp (this same procedure is also used to apply
pressure to your toggle clamp during lock-up and injection).
1. Jog your clamp to the full close position (mold halves mated).
2. Enter a value that should produce minimum clamp pressure into the
set-output word (DYC09, DYC10, DYC11, or DYC12)
corresponding to your clamp tonnage (lock-up) pressure valve.
3. Set the other three values equal to the set-output values you would
normally use during tonnage (from LPC33-36).
ATTENTION: A value of 0 entered in your data table does not
necessarily correspond to zero pressure or flow. For example, a
bi-directional valve would require a set-output value of 50%
(5000) to obtain 0 PSI. Amplifier electronics or valve spools
may also be designed such that 0 volts signal input does not
correspond to no flow or pressure. Please consult your valve
and amplifier specifications for more details.