Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 171)

Span Your Valves
Chapter 9
9-5
Span Your Low Pressure Close Pressure Valve(s)
Span your clamp pressure valve for smooth operation at the highest desired
LPC pressure. Do this in the following procedure by finding the optimum
values for these words:
Minimum Pressure Control Limit LPC41
Maximum Pressure Control Limit LPC42
Selected Pressure Valve, Output for Minimum LPC43
Selected Pressure Valve, Output for Maximum LPC44
Important: If PanelView is operational for clamp 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, make sure you
installed a test mold in the machine. Programming errors,
configuration errors, or hydraulic problems could lead to
personal injury and/or machine damage.
ATTENTION: Be sure all machine guards and shields are in
place before proceeding to guard against personal injury.
1. Jog your clamp to the full close position (mold halves mated).
2. Align all other machine hydraulics to simulate low pressure close.
For example, shut off applicable pumps and align applicable valves.
3. Copy initial values from LPC09-12 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 LPC 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.