Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 142)

Span Your Clamp and Ejector Valves
Chapter 9
9-6
Test Your Low Pressure Close Pressure Valve for Linearity
1. Select a pressure setpoint for Low Pressure Close which is typical of
the pressure you would run during machine operation. Enter this
setpoint into CPC37 (Pro-Set 600 address N43:273).
2. Download changes to the QDC module (refer to chapter 4 for detailed
instructions).
3. Jog your clamp to a position just outside the Low Pressure Close start
position (CPC61).
4. Enable Low Pressure Close (DYC02-B03, Pro-Set 600 address
B35/403). The clamp should move from its start position through the
Low Pressure Close profile. If no motion is observed, check the
following:
- Verify that none of your clamp or ejector overtravel alarms are set.
The QDC module inhibits clamp low pressure close if SYS07-B00
through SYS07-B05 are set.
- Verify that the ejector is inside the ejector position for clamp close
enable (EPC63).
- Verify that no programming error codes exist in SYS61 and
SYS62.
5. Upon completion of Low Pressure Close, observe the pressure
reported back for low pressure close segment 1 (CPS37, Pro-Set 600
address N43:689). If the observed pressure is not approximately
equal to the setpoint entered in CPC37, then check:
- Is your high volume pump dropping out early enough?
- Are any high volume solenoids which may be in the circuit
dropping out at the correct time?
If the observed pressure CPS37 is still not representative of the
setpoint (within 20% of CPC37), your pressure valve is not linear
over the desired range of operation .
If: And Your
Selected Valve is:
Then:
CPS37 was less than CPC37 Direct Acting Increase LPC44 by 5%
Reverse Acting Decrease LPC44 by 5%
CPS37 was more than
CPC37
Direct Acting Decrease LPC44 by 5%
Reverse Acting Increase LPC44 by 5%
Repeat steps 2 through 5 as necessary.