5 Advanced Operations
5 - 4
E5@C-T Digital Temperature Controllers User’s Manual (H185)
z Using the PV Input Shift
(1) Find the two points to shift and determine the PVs after the shifts are applied.
Example: Shift 500°C (temperature before shifting) to 550°C (temperature after shifting).
Example: Shift 1,000°C (temperature before shifting) to 970°C (temperature after shifting).
(2) Find the PV slope coefficient from the above results.
(970 − 550) / (1,000 − 500) = 0.840
* Do not yet set the PV Slope Coefficient parameter in the Digital Controller.
(3) Adjust the PV display on the Digital Controller to the point to be shifted.
Example: Adjust the PV to 500°C.
(4) Set the PV Slope Coefficient parameter to the value that you found in step 2.
Example: Set the PV Slope Coefficient parameter to 0.840.
(5) Read off the PV after the setting is changed.
Example: The PV will be displayed as 420°C.
(6) Find the difference between the anticipated PV (i.e., the PV after shifting) and the PV
that you read off in step 5.
Example: 550°C − 420°C = 130°C
(7) Set the PV Input Shift parameter to the value that you found in step 6.
Example: Set the PV Input Shift parameter to 130°C.
After shifting
970
°C
Before shifting
500°C 1000°C
200°C
1300°C
1,000°C is shifted to 970°C.
500°C
550°C
1000°C
500°C is shifted to 550°C.
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