Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE User Manual
Page 164
Span Your Clamp and Ejector Valves
Chapter 9
9-28
If current settings do not match our recommended values from previous
chapters, we suggest you correct these values now using the download
procedure discussed in chapter 4.
Span Your Ejector Pressure Valve(s)
Span your Ejector Pressure vs. Position Profile for smooth operation at the
highest desired ejector pressure. Do this by finding the optimum values for
EAC41-44 and ERC41-44 using the values given above and the procedure
below.
Optimal pressure reference values are determined using set-output.
Ejector Advance
1.
Jog your ejectors to the full advanced position.
2.
Align all other machine hydraulics to simulate Ejector Advance. For
example, if certain pumps are enabled during Ejector Advance,
enable them at this time. If a certain valve alignment exists during
Ejector Advance, line the valves up accordingly at this time.
3.
Enter a value that should produce minimum pressure into the
set-output word (DYC09, DYC10, DYC11, or DYC12)
corresponding to the selected valve for Ejector Advance pressure
control. Enter all other unselected valve set-output values to what
you would normally use during Ejector Advance (copy EAC09-12
into DYC09-12).
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.
4.
Enable set-output by transitioning DYC01-B08 (Pro-Set 600 address
B35/392) from a 0 to a 1.
5.
Observe the pressure reported back in SYS26 (Pro-Set 600 address
N41:178).
If this pressure is greater than zero, marginally adjust the selected
Ejector Advance valve set-output value in an attempt to obtain
zero pressure feedback. Stop the adjustments when you observe
the smallest pressure attainable. This procedure may be required
on a bi-directional valve with a spool offset.