Setting Clutch And Counterbalance Air Pressure Limits - Honeywell SmartPAC 2 User Manual

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Setting Clutch and Counterbalance Air Pressure
Limits
WPC usually uses pressure sensors to monitor both clutch air and counterbalance pressure
levels. (Optionally, you can use pressure switches.) You can set a minimum lower limit for
your clutch air pressure. If the clutch air pressure drops below the limit, an error message
"F45" (Main system air below sensor limit) appears on the display. Refer to Chapter 7 for
more on this error message. A clutch air value of 0 set in Initialization disables the clutch air
limit entirely, and the level is not displayed in SmartPAC's Adjust mode.
You can also set up tolerance to monitor your press's counterbalance pressure level.
Counterbalance air pressure is used to compensate for customary variations in upper die
weights. The target setpoint can be tied to a tool number in SmartPAC's Programming mode.
To program the setpoint value, refer to "Making WPC Settings in SmartPAC's Programming
mode" in Chapter 5. A tolerance value of 0 set in Initialization disables the counterbalance
limits altogether, and are not displayed in SmartPAC's Programming and Adjust modes.
Here is an example of how it works: We set the counterbalance tolerance (Cntr. Bal. Diff.
+/-) to 5 PSI in Initialization. And we program tool #1's counterbalance setpoint to 40 PSI in
SmartPAC's Programming mode. This means that our counterbalance air pressure levels
cannot deviate outside the range of 35 to 45 PSI whenever the press is at or passing through
"0" degrees or Top Dead Center (TDC). It is acceptable for the counterbalance air pressure
to vary outside the limits at Bottom Dead Center (BDC). If the counterbalance air pressure
limits at TDC has deviated, error message "F46" (Counterbalance air outside sensor limits)
appears on the display. See Chapter 7 for more on this message.
1. If you are not already there, get into SmartPAC's Initialization mode, and select "Press
Control." In the WPC Initialization menu that appears (see Figure 4 - 28), select "Press
Parameters." Highlight and select "Main Air Limit." Then press ENTER.
2. Use the number keys to set the value, and then press ENTER to confirm your selection.
3. Use the cursor key to highlight "Cntr Bal + / -." Press ENTER to select.
4. Repeat step 2 for "Cntr Bal + / -."
5. Press RESET when you are done to exit back to the Initialization menu.
NOTICE
If you use RamPAC to control the counterbalance pressure, you must use a counterbalance
pressure switch with the WPC. See "Counterbalance Air Pressure Switch," page 39.
Page 238
SmartPAC 2 with WPC Integration
Chapter 4 SmartPAC 2 Initialization Mode