Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 163)

Span Your Valves
Chapter 9
9-6
13. Download your final values for LPC41-44 to the QDC module by
downloading the LPC block.
Important: If downloading from your programming terminal, you must
download LPC followed by CPC (chapter 4).
To download: Set: B21/
LPC 5
CPC 6
Test Valve Linearity with a Low Pressure Close (LPC) Profile
1. Jog your clamp to a position just inside the LPC start position
(CPC61).
2. Enable the LPC profile by setting DYC02-B03 (B34/403) = 1. The
clamp should move from its start position through the LPC profile. If
no motion is observed, verify that:
- no overtravel alarms are set. The QDC module inhibits clamp low
pressure close if alarm bits SYS07-B00 through -B05 are set.
- no programming error codes exist in SYS61 and SYS62.
3. At completion of the LPC profile, observe the pressure reported for
LPC segment 1, CPS37 (N43:689). If the observed pressure is not
within 20% of the value you entered in CPC37, then check:
- Is your high-volume pump dropping out early enough?
- Are any high-volume solenoids dropping out too early?
If the observed pressure CPS37 is still not within 20% of CPC37, your
pressure valve is not linear over the desired range. Correct for a non-linear
valve as follows:
If: And Your Selected
Valve is:
Then change LPC44 (N43:220)
as follows:
CPS37 was less than CPC37 Direct Acting Increase in 5% steps
Reverse Acting Decrease in 5% steps
CPS37 was more than CPC37 Direct Acting Decrease in 5% steps
Reverse Acting Increase in 5% steps
To do this: change LPC44, download the LPC and CPC blocks, repeat
steps 1-3. Repeat as necessary.
Important: If downloading from your programming terminal, download
LPC followed by CPC with bits B21/5 and 6 respectively (chapter 4).