Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 225)

Span Your Valves
Chapter 9
9-59
Span Your Ejector Velocity Valve(s)
Span your ejector valve(s) for smooth operation at highest desired velocity.
Do this in the following procedure by finding the optimum values for:
Minimum Velocity Control Limit EAC45, ERC45
Maximum Velocity Control Limit EAC46, ERC46
Selected Velocity Valve, Output for Minimum EAC47, ERC47
Selected Velocity Valve, Output for Maximum EAC48, ERC48
Important: This procedure must be done twice, because cylinder
dynamics are different for the rod side and piston side.
Important: If PanelView is operational for ejector 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 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. Obtain a copy of the flow rate curves provided by your flow valve
manufacturer. The flow rate curves graphically illustrate the flow
through a valve at different input voltage or current levels and at
different pressure drops across the valve’s spool.
2. From these curves, determine the minimum and maximum ejector
advance and retract flows available from your flow valve at the
pressure you would normally run during ejector operation. Record
the flows, along with the input voltages/current associated with them.