Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE User Manual
Page 200
Span Your Valves
Chapter 9
9-43
ATTENTION: Be sure all machine guards and shields are in
place before proceeding.
1.
Jog your clamp to the full open position.
2.
Align all other machine hydraulics to simulate clamp open motion.
For example, enable required pumps and align required valves.
3.
Copy initial values from FOC09-12 (N43:305-308) into DYC09-12
(N40:121-124) of your PLC-5 data table with this exception:
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 SYS28 (N40:180).
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 SYS28 (N40:180), (usually 0 PSI or Bar) into FOC41,
SOC41, TOC41, and OSC41 (N43:337, 397, 457, and 517), the
minimum pressure control limits.