YOKOGAWA DPHarp EJX210B, Руководство пользователя

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<8. Setting Parameters>
8-11
IM 01C27C01-01EN
• When changing the device information, input
the information based on the following limitation
on the number of characters.
- Message function (up to 32 characters)
TRANSDUCER block:Tag Description
AI1-AI3 block: Tag Description
8.3.5 Unit
The unit parameter is set at the factory before
shipment if specified at the time of order. Follow the
procedure below to change the unit parameter.
• Procedure to call up the Unit Index display
(Units Index)
AI1-AI3 block: Scale.Units Index
To change the Unit display, choose desired
unit among the list of displayed unit selecting
AI1 block as for the differential pressure, AI2
as for the static pressure and AI3 block as for
temperature in the AI blocks.
8.3.6 Range Change
The range values are factory-set as specified by
the customer. To change the range, follow the steps
below.
The measurement span is determined by the upper
and lower range values. In this method, the upper
and lower range values can be set independently,
and the span changes according to the range limit
values sent to the transmitter.
• Procedure to call up the PV Range display
AI1, AI2 block: PV Range
Select the AI1 block for the differential pressure
and the AI2 block for the static pressure, then
select “EU at 0%” and “EU at 100%” displayed
in the PV Range parameters, and input the
lower range and upper range values for the
range, respectively.
8.3.7 Output Signal Low Cut Mode Setup
Low cut mode can be used to stabilize the output
signal near the zero point.
( There is 10% of hysteresis at only point of
transition from low to high)
[Setup Low Cut Value]
• Procedure to call up the Low Cutoff* display
AI1 block: Low Cutoff*
Example: setup LOW_CUT of output to 15%
*Low Cutoff
= (“Eu at 100%” - “Eu at 0%”) × 0.15 + “Eu at 0%”
[Setup Low Cut Mode]
• Procedure to call up the Low Cut Mode display
AI1 block: Low Cut Mode
Example: Low cut at 20%
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(%)
50
20
0 50 (%)
For low cut in Linear mode
Example:
Low cut 20%
Input
Output Output
For low cut in Zero mode
(%)
50
20
0 50 (%)
Example:
Low cut 20%
Input
Figure 8.2 Low Cut Mode
The low cut point has hysterisis so that the output
around the point is behaved as below figure.
<Example>
Output mode: Linear
Low cut mode: Zero
Low cut: 20.00%
Output
Setting range:
0 to 20%
Input
0%
(20%)
2%
Low cut
point
Hystrersis fixed at 10%
of the cut point
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