Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 177)

Span Your Valves
Chapter 9
9-20
If these are not your current values, we suggest that you correct them now
using the download procedure discussed in chapter 4.
Span Your Injection Pressure Valve
Span your injection valve for smooth operation at highest desired pressure.
Do this in the following procedure by finding the optimum values for:
Minimum Pressure Control Limit INC41 (N44:37)
Maximum Pressure Control Limit INC42 (N44:38)
Selected Pressure Valve, Output for Minimum INC43 (N44:39)
Selected Pressure Valve, Output for Maximum INC44 (N44:40)
Important: If PanelView is operational for injection profiles, use it to:
observe actuals
change and download setpoints
run profiles
Important: We suggest that you read this procedure before starting.
ATTENTION: As with any machine start-up, install a test
mold. Programming errors, configuration errors, or hydraulic
problems could lead to machine damage or injury to personnel.
ATTENTION: Be sure all machine guards and shields are in
place before proceeding.
1. Manually jog your ram (screw) to the mold-end position so you can
exert maximum pressure against the nozzle tip.
2. Align all other machine hydraulics to simulate injection: enable
pumps and align valves to their normal injection state.
3. Copy initial values INC09-12 (N44:5-8) 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 (N40:121-124) 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.