Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 234)

Tune Your Machine
Chapter 10
10-26
EndĆofĆsegment Position Setpoints
These setpoints depend on the particular mold and clamp configurations of
your plastic molding machine. In general, you are not required to enter
any end-of-segment position setpoints for the clamp. If you DO NOT use
them, expect the following results in these clamp movements:
For this movement The QDC module Then the QDC module:
First Clamp Close Uses any nonĆzero velocity setpoint (CPC09)
or pressure setpoint (CPC10) until the clamp
reaches the protective start LPC position
(CPC61). The 2nd and 3rd clamp close
movements are not used.
• Either stops and zeros outputs (CPC03ĆB11 = 1)
• or begins LPC movement (CPC03ĆB11 = 0)
until the clamp reaches the configured moldĆsafe
position (CPC62).
First Clamp Open Uses any nonĆzero velocity setpoint (OPC09)
or pressure setpoint (OPC10 until the clamp
reaches the protective start open slow position
(OPC61). The 2nd and 3rd clamp open
movements are not used.
• Either stops and zeros outputs (OPC03ĆB11 = 1)
• or begins OpenĆSlow movement (OPC03ĆB11 =
0) until the clamp reaches the configured mold
fully open position (OPC62).
During normal operation, the only required end-of-segment position
setpoints are for:
first clamp close to identify the operational start LPC position
first clamp open to identify the operational start open-slow position
If you need additional profile segments (with the same unselected valve
set-output values), begin with:
2nd segment of first clamp close for clamp close profiles
2nd segment of first clamp open for open profiles
Use all available segments in first clamp close and first clamp open before
using any in second and third clamp close/open (unless you require
different unselected valve set-output values for successive segments).
Important: Fast segment velocities or high segment pressures may cause
the clamp to overshoot the start low pressure close or start open-slow
position. If you increase a velocity or pressure setpoint in a fast clamp
close (or open) movement, we recommend that you increase the distance to
the start LPC position (or decrease the distance to the open-slow position)
at least temporarily to assure a successful low pressure close (or open
slow) movement and mold closure (or opening).
Important: Avoid using the same velocity or pressure setpoint on
sequential segments. For better control, use a single segment of longer
length or duration (figure 10.3).