Graco PCF Instructions - Parts Manual page 72

Repair
Calibrate Amplifier
(Heated fluid plates only)
1. Prepare Fluid Plate Assembly for Repair, page
66.
2. Remove outlet pressure sensor from outlet fitting to
ensure there is no pressure applied to the sensor.
Adjust Display Settings
3. With the system in setup mode, navigate to the
Advanced set of screens.
4. Press
Screen 2.
5. Press to access the fields to make changes.
6. Press to move the Pressure Units field. Press
to open the drop-down list, and select psi.
Press to enter the new units.
7. Press to exit edit mode.
8. With the system still in setup mode, navigate to the
Fluid Plate set of screens.
72
to scroll to Advanced Setup
9. Press to scroll to the Pressure Sensors
screen (screen 5).
10. Press to access the fields to make changes.
11. Press to move the Outlet Offset field. Set the
psi to 0. Press
12. Press to exit edit mode.
Adjust Amplifier Settings
13. Remove cover from amplifier (116). See Replace
Amplifier, page 71.
14. Ensure the EXCITATION SELECTOR jumper is in
the middle position (5 Vdc).
15. Ensure the COARSE GAIN dipswitch 1 is set to ON.
All others should be set to OFF.
16. Adjust the FINE ZERO potentiometer until the outlet
pressure on the display reads 0.
NOTE: The display is not capable of displaying neg-
ative pressures. Therefore, increase the FINE ZERO
potentiometer clockwise until the display reads
greater than 0. Then, decrease the potentiometer
counter clockwise until the display reads 0.
to enter the new setting.
313377L