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7-43
Chapter 7. PARAMETER SETUP
●
C90 (special function)
• Normally, set to “0”.
• When set to 102, the control output range 0 to 100% becomes 0 to 20 mA when
current output (including heat/cool output) is set as the output. However, note
that when control output is less than 0%, current output is 0 mA, and when
control output is less than 5%, the accuracy is ±0.5%.
• When set to 103, the control output range 0 to 100% becomes 0 to 20 mA when
current output (including heat/cool output) and auxiliary output is set as the
output. However, note that when control output is less than 0%, current output is
0 mA, and when control output is less than 5%, the accuracy is ±0.5%.
• When set to 241, Zener barrier adjustment (
C91
) is displayed when the input 1
range type (
C03
) is an RTD.
• When set to 241, Zener barrier adjustment (
C92
) is displayed when the input 2
range type (
C23
) is an RTD.
●
C91 (input 1 Zener barrier adjustment)
●
C92 (input 2 Zener barrier adjustment)
The following adjustment must be made when using a Zener barrier.
①
Turn the DCP32 OFF. When you have finished mounting and wiring the
DCP32, short-circuit across the
A
and
B
terminals of the RTD.
②
Turn the DCP32 ON again, and set setup data
C90
setting to 241. For details
on how to change settings, see “
7-1 Parameter Setup
” (page 7-1).
③
Display the setup data
C91
or
C92
setting.
④
Press the
ENT
key to display the difference (
A-B
) between the resistances of
the Zener barriers connected to leads
A
and
B
on the lower display.
⑤
Press the
ENT
key to memorize the difference (
A-B
) between the resistances
on the DCP32.
⑥
Press the
DISP
key to set the DCP32 to the basic display state.
⑦
Turn the power OFF, and remove the short-circuit 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 carried out
on the Zener barrier. When using an RTD without a Zener barrier, re-
adjust without the Zener barrier.
32
33
34
Short-circuit
C
B
A
Zener barrier
Zener barrier
Zener barrier
DCP32
32 33 34
28
29
30
Terminals are for when input 1
is used.
In case of input 2, these terminals become
terminal (terminal C), terminal
(terminal C) and terminal (terminal A).