Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 217)

Span Your Valves
Chapter 9
9-51
Test Valve Linearity with a Velocity vs. Position Profile
1. Select velocity vs. position control for the entire clamp open
operation by resetting the following bits to zero:
OPC03-B00 (B37/608)
OPC03-B02 (B37/610)
OPC03-B04 (B37/612)
OPC03-B06 (B37/614)
2. Download this change to the QDC module.
Important: If downloading from your programming terminal, download
OPC by setting download bit B21/20 (chapter 4).
3. Jog your clamp to the full close position (mold halves mated).
4. Enable first clamp open by setting DYC02-B10 (B34/410) to 1. The
clamp should move from its start position through the first clamp
open profile, and then execute open slow. If no motion is observed,
verify that:
- no overtravel alarms are set. The QDC module inhibits clamp
open if SYS07-B00 through -B05 are set
- no programming error codes exist in SYS61 and SYS62
5. Upon completion of clamp open, observe the velocity reported for 1st
clamp open segment 2 in OPS12 (N43:720). This velocity should be
relatively close to the setpoint you entered in OPC12 (N43:548). If
the observed velocity is not within 25% of the setpoint, verify that:
- you choose the correct values from your flow rate curves
- your calculations are correct
If the observed velocity OPS12 is still not within 20% of OPC12,
your pressure valve is not linear over the desired range. Correct as
follows:
If: And Your
Selected Valve is:
Then change FOC48
(N43:344) as follows:
OPS12 was less than OPC12 Direct Acting Increase by 5%
Reverse Acting Decrease by 5%
OPS12 was more than
OPC12
Direct Acting Decrease by 5%
Reverse Acting Increase by 5%
To do this: change FOC48, download the FOC block, and repeat
steps 3-5. Repeat as necessary.