Honeywell DCP551 Mark ΙΙ User Manual page 135

C99
(PV1 zener barrier adjustment)
C100
(PV2 zener barrier adjustment)
The adjustment described below must be performed when a zener barrier is used.
(1) Turn off the DCP551. When installation and wiring is completed, short-circuit A and
(2) Turn on the DCP551 and set setup data
(3) Display setup data
(4) Press the ENTER key to display the difference in resistance (A-B) between zener
(5) Press the ENTER key to store the difference in resistance values (A-B) in the
(6) Press the DISP key to return to the normal display mode.
(7) urn off the DCP551 and disconnect the wire between A and B.
HANDLING PRECAUTIONS
• Adjust the resistance in the zener barriers connected to wire A and B to 20Ω
• This adjustment is not required for inputs other than resistance temperature
• When a zener barrier has been adjusted, compensation is performed for this
B on the resistance temperature detector.
PV1 zener barrier adjustment
54 55 56
Short-
circuit
A B C
RTD
C99
and
barriers connected to wire A and wire B.
DCP551.
or less. Adjustment is not possible if the resistance is higher than 20Ω.
detectors or when zener barriers are not to be used.
zener barrier. When resistance temperature detector inputs not employing
zener barriers are to be used, perform the above adjustment without the
zener barriers.
Chapter 7. PARAMETER SETUP
PV2 zener barrier adjustment
57 58 59
Short-
circuit
A B
RTD
C98
to 241.
C100
.
C
7-33