7-61
Chapter 7. PARAMETER SETUP
• When set to 113, square root extraction is used for the MV.
• When set to 114, the rate time (d, dd) and reset time (I, dI) settings
are in units of 0.1 s, and square root extraction is used for the MV.
• When set to 115, the rate time (d, dd) and reset time (I, dI) settings
are in units of 0.01 s, and square root extraction is used for the MV.
• When the input 1 range type (
C
0
3
) is an RTD in setup 241, Zener
barrier adjustment (
C
9
1
) is displayed.
●
●
C
9
1
(Input 1 Zener barrier adjustment)
The following adjustment must be made when using a Zener barrier:
(1) Turn the
DCP31
OFF. When you have finished mounting and
wiring the
DCP31
, short-circuit across A and B on the terminals
of the RTD.
(2) Turn the
DCP31
ON again, and set setup data
C
9
0
setting to
241. For details on how to change settings, see 7-1 Parameter
Setup (page 7-1).
(3) Display the setup data
C
9
1
setting.
(4) Press
ENT
to display the difference (A—B) between the resistanc-
es of the Zener barrier connected to leads A and B on the lower
display.
(5) Press
ENT
to memorize the difference (A—B) between the resis-
tances to the controller.
(6) Press
DISP
to set the
DCP31
to the basic display state.
(7) Turn the power OFF, and remove the short across A and B.
Handling Precautions
• The resistance error of the Zener barrier connected to leads A
and B cannot be adjusted unless it is 20 Ω or less.
• This adjustment is not required when a Zener barrier and an
input other than an RTD are not used.
• Once the Zener barrier has been adjusted, compensation is car
-
ried out on the Zener barrier. When using on an RTD without a
Zener barrier, re-adjust without the Zener barrier.
• Use zener barriers recommended by Azbil.
Recommended zener barriers (for RTD)
Product No.8907/22-02/120 (Azbil Corporation)
Product No. NZB3-1R75 (Nakamura Electric Mfg.Co.,Ltd.)
32
33
34
C
B
A
Zener barrier
Zener barrier
Zener barrier
DCP31
Short-circuit
