Page 22 of 41
Rev: 2024-10-03
6.5 Calibration
Note: Under normal conditions, calibration should not be necessary, it is only
included if the configuration of the controller is such that the default or standard
calibration is unacceptable. This procedure requires a multimeter capable of
measuring current (amps).
6.5.1 Input Calibration
1) Reboot Controller; holding down the outer two buttons at the logo screen (when
the word “CAL” appears in the lower-right of the LCD, you may release the
buttons).
a. First option will be “Reset Fact Settings”; answer “NO” here if you do not
wish to erase or reset ALL settings to their factory defaults
b. Press “NEXT” to advance to “CONFIG-AI-CALIB”
2) Make sure input is at 4 mA
a. Using a loop power device, such as the Time Mark model 680, make sure
the input is at 4 mA.
b. The ADC value shown should normally be between 185 and 195.
3) Press Selct when arrows are pointing at “ZERO”
4) Make sure input is at 4 mA
5) Press BACK to cancel or press SAVE to accept the new calibration value as 4
mA
6) Move the arrows to “SPAN”
7) Make sure the input is at 20 mA
8) Press Selct when arrows are pointing at “SPAN”
9) Make sure the input is at 20 mA
a. Using a loop power device, such as the Time Mark model 680, make sure
the input is at 20 mA.
b. The ADC value shown should normally be between 925 and 935.
10) Press BACK to cancel or press SAVE to accept the new calibration value as 20
mA
11) Press NEXT to proceed to output calibration
6.5.2 Output Calibration
There is an “auto” calibration feature that should allow the output to be within 10%;
this is an experimental feature and should be used with caution.
1) You will need a measurement multimeter connected to the 4-20 mA output of the
controller
2) Press Selct when the arrows are pointing at “ZERO”
3) The output should switch to 4 mA, use the +1 and -1 buttons to adjust each digit,
pressing the left arrow key (←) to move between the digits. Adjust this value until
the multimeter is reading 4.00 mA
4) Press ENTER to lock in this value
To Next Page
Loading...