Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 140)

Span Your Clamp and Ejector Valves
Chapter 9
9-4
Select Start LPC on Zone Overrun (CPC03-B11 = 0)
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 Low Pressure Close Pressure Valve
Span your Low Pressure Close Pressure vs. Position Profile for smooth
operation at the highest desired LPC pressure. Do this by finding the
optimum values for LPC41-LPC44 using the values given above and the
procedure below.
Optimal pressure reference values are determined using set-output:
1. Jog your clamp to the full close position (mold halves mated).
2. Align all other machine hydraulics to simulate clamp Low Pressure
Close. For example, if certain pumps should be disabled during Low
Pressure Close, disable them at this time. If a certain valve alignment
should exist during Low Pressure Close, line the valves up
accordingly at this time.
3. Enter a value to produce minimum pressure into the set-output word
(DYC09, DYC10, DYC11, or DYC12) corresponding to the selected
valve for clamp Low Pressure Close. Enter all other unselected valve
set-output values to what you would normally use during Low
Pressure Close (copy LPC09-12 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 SYS28 (Pro-Set 600 address
N41:180).
If this pressure is greater than zero, marginally adjust the selected
LPC valve set-output value in an attempt to obtain zero pressure
feedback. Stop the adjustments when you observe the smallest