Chapter 7. PARAMETER SETUP

C99 (PV1 zener barrier adjustment)

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C100 (PV2 zener barrier adjustment)

 

The adjustment described below must be performed when a zener barrier is used.

(1) Turn off the DCP552. When installation and wiring is completed, short- circuit A and B on the resistance temperature detector.

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(2)Turn on the DCP552 and set setup data C98 to 241.

(3)Display setup data C99 and C100.

(4)Press the ENTER key to display the difference in resistance (A-B) between zener barriers connected to wire A and wire B.

(5)Press the ENTER key to store the difference in resistance values (A-B) in the DCP552.

(6)Press the DISP key to return to the normal display mode.

(7)urn off the DCP552 and disconnect the wire between A and B.

Handing Precautions

Adjust the resistance in the zener barriers connected to wire A and B to 20Ω or less. Adjustment is not possible if the resistance is higher than 20Ω.

This adjustment is not required for inputs other than resistance temperature detectors or when zener barriers are not to be used.

When a zener barrier has been adjusted, compensation is performed for this zener barrier. When resistance temperature detector inputs not employing zener barriers are to be used, perform the above adjustment without the zener barriers.

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Honeywell DCP552 Mark II user manual Handing Precautions, C100 PV2 zener barrier adjustment