Appendix J - Procedure to reset the EEPROM to factory settings
The SmartCal smart positioner is a digital device. Positioner operation relies on data that is stored
in the positioner’s EEPROM chip. Calibration and configuration data that has been established
during the positioner’s calibration is stored in the EEPROM. Under abnormal conditions this stored
information can become corrupted. If this occurs it is necessary to reset the chip and recalibrate
the positioner.
1. Remove power to the positioner. This can be done by removing the plug-in style terminal strip.
2. Press and hold the CAL button while replacing the terminal strip (returning power). The LCD will
show ‘Starting Up’ for several seconds while holding down the CAL button.
3. Continue to hold the CAL button until the LCD shows ‘Factory Default Intialization. No?’ When
this statement appears release the CAL button. Use the down arrow to change ‘No’ to ‘Yes’. To
begin Factory reset procedure press the Cal button.
4. When mA METER CALIBRATION appears release the Up-arrow button.
5. After releasing the Up-arrow button you will be prompted to enter 4.0 mA. Change your input to
the positioner to exactly 4.0 mA and press the CAL button. If your zero position signal is other
than exactly 4.0 mA then use the Up/Down arrow buttons to adjust the value shown on the
positioner’s LCD to match the zero position mA and press the CAL button.
6. You will then be prompted to enter 20 mA. Change your input to the positioner to exactly 20.0
mA and press the CAL button. If your full-scale position signal is other then exactly 20.0 mA
then use the Up/Down arrow buttons to adjust the value shown on the positioner’s LCD to
match the full-scale position mA and press the CAL button.
7. The positioner will automatically return to normal operating mode.
8. If desired, follow the normal calibration procedure as described in the manual.
AVID SmartCal valve positioner
Installation & operating instructions
page 41
