Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE User Manual
Page 210
Span Your Valves
Chapter 9
9-44
Important: Enter a value corresponding to zero pressure into the word
DYC09-12 for output 1, 2, 3, or 4 that drives the selected clamp pressure
valve.
ATTENTION: A value of 0 does not always correspond to zero
pressure or flow. For example, a bi-directional valve requires a
set-output value of 50% (5000) to obtain 0 PSI. Valve spools or
amplifier electronics may also allow pressure or flow at 0 volts.
4.
Enable set-output by transitioning DYC01-B08 (B34/392) to 1. This
forces the QDC module to apply the values in DYC09-12 directly to
its outputs 1-4, respectively.
5.
Adjust the set-output value DYC09-12 (N40:121-124) that
corresponds to the selected clamp open pressure valve, and observe
the pressure reported in SYS26 (N40:178).
For a bi-directional valve with a spool offset:
If this pressure is greater than zero, adjust the selected valve
set-output value to obtain zero pressure. Stop adjusting it when
you observe the smallest pressure attainable.
For a uni-directional valve with no response at low signal level:
If this pressure is zero, adjust the selected valve set-output value
until the observed pressure just exceeds zero. Then re-adjust it
until you just observe zero again.
For a uni-directional valve with a pressure actual greater than
zero but with zero output to the valve: This is lowest pressure.
6.
Once you are satisfied you obtained the lowest possible pressure or
the highest possible signal at zero pressure, copy the pressure
observed in SYS26 (N40:178), (usually 0 PSI or Bar) into FOC41,
SOC41, TOC41, and OSC41 (N43:337, 397, 457, and 517), the
minimum pressure control limits.
7.
While maintaining this minimum pressure, observe the actual
set-output value in SYS41-44 (N40:193-196) that corresponds to your
selected clamp open pressure valve. Copy this value into FOC43,
SOC43, TOC43, and OSC43 (N43:339, 399, 459, and 519), the
selected pressure valve output for minimum.
8.
Change the set-output value in DYC09-12 (N40:121-124) that
corresponds to the clamp open pressure valve by 50%, and then in
5% steps while observing the clamp pressure in SYS26 (N40:178).
Stop adjusting it when the observed pressure no longer increases with
an increase in the set-output value. Now the pressure in SYS26
(N40:178) is the maximum obtainable clamp open pressure.