GE DigitalFlo XGM868i, Service Manual

Page: 56 / 80

Appendix B. Calibration and Testing with PanaView
48 DigitalFlow™ XGM868i Service Manual
B.4.3 RTD Inputs
RTD inputs may be added to the Model XGM868i by installing an appropriate option card in Slot 1 . This option card
contains two or four RTD inputs, which are designated as A, B, C and D. Both the set and slope temperature values for
each input must be calibrated.
Calibration of the RTD inputs requires the use of a calibrated RTD source.
IMPORTANT:
If a
Slot 0
analog output will be used to calibrate the analog inputs, the
Slot 0
analog output calibration
procedure must be completed first.
Prepare for the calibration procedure by connecting an independent calibrated RTD source to the desired input of the
option card. See Figure 4 on page 12 to identify the
RTD (+) and COM(-) pins for Input A on terminal block J2.
1. In the center pane of the Calibration/Test window, double-click on Slot 1 .
2. Double-click on the desired input to open the RTD Calibration menu.
IMPORTANT: The procedure for calibrating each input is identical. However, be sure to reconnect the temperature
reference on terminal block
J2
. See Figure 4 on page 12 for the correct pin numbers.
Proceed to the corresponding sub-section for specific instructions on each of the options shown above.
B.4.4 Entering the Set Point
1. Before proceeding, place the RTD in a temperature bath and allow it to stabilize at the desired set point
temperature. If you have connected the RTD to an RTD simulator, set the RTD simulator to the low temperature
value.
2. Double-click on Set t o program the RTD set point.
3. In the right pane, enter the desired set point temperature and click
[Next Item]
.
4. Double-click on STORE to accept the new set point value or ABORT to cancel the entry.
B.4.5 Entering the Slope
1. Place the RTD in a temperature bath and allow it to stabilize at the desired slope point temperature. If you have
connected the RTD to an RTD simulator, set the RTD simulator to the high temperature value.
2. Double-click on Slope to program the RTD slope point.
3. In the right pane, enter the desired slope point temperature and click
[Next Item]
.
4. Double-click on STORE to accept the new slope point value or ABORT to cancel the entry.
Click [Exit Page] to return to the Slot 1 window and calibrate additional inputs/outputs, or click [Exit Page] again to
close the Calibration/Test menu.