Yokogawa EJX115A - Manual (Page 27)

<3. Parameter Setting>
3-14
IM 01C25T01-06EN
• Procedure to call up the Quick resp display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Detailed setup →
Signal condition → Quick resp →
EJX_HART 5[1.2]
DTM
Configuration → Analog Output →
Quick resp →
→ Off Set from 0.50 to 100.00
→ On Set from 0.00 to 100.00
3.2.6 Output Signal Low Cut Mode Setup
Low cut mode can be used to stabilize the output
signal near the zero point.
The low cut point can be set in a range from 0 to
20%, the direct ratio corresponding to the output
signal of 4 to 20 mA. (Hysteresis for the cut point:
±10% of the cut point)
Either “Linear” or “Zero” can be selected as the low
cut mode. Unless otherwise specified, the cut mode
is set to “Linear” at the factory.
The default value of Low cut is set according to the
combination of the Output mode (Xfer fnctn) and
Integral indicator display mode (Disp Pres % fnctn).
See below table.
Relationship of default value of Low cut and
Low cut point
Combination of
output mode and
display mode
Default
value of
Low cut
Low cut
point for
the output
signal/
display
# Output
mode
Display
mode
1) Linear Linear 10% 10% / 10%
2) Sq Root Sq Root 10% 10% / 10%
3) Linear Sq Root 1%* 1% / 10%
4) Sq Root Linear 10% 10% / NA
*: It is applied for software revision 2.02 or later. For
previous software version, it is set in 10%.
In the case 3) above, Low cut point for the display is
square root of Low cut value.
(Example: Low cut value; 2%, Low cut point; 14%)
Note that when the output modes of the output
signal and the display are selected as “Sq root”
and “Linear” accordingly, the low cut function is not
available for the display value.
(%)
50
(%)
50
0
50
(%)
50
(%)
Output Output
For low cut in linear mode
Input
20 20
0
For low cut in zero mode
Input
F0302.ai
Example: Low cut at 20%
Figure 3.1 Low Cut Mode
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Basic setup →
EJX_HART 5[1.2]
DTM
Easy Setup → or Configuration →
Analog Output →
→ Low cut Set from 0 to 20% of output
→ Low cut mode Select “Linear” or “Zero”
The low cut point has hysteresis so that the output
around the point is behaved as below figure.
<Example>
Output mode: Linear
Low cut mode: Zero
Low cut: 20.00%
F0303.ai
Setting range: 0 to 20%
2% 2%
4mA
Output Low cut point
Input
Hysteresis
fixed at 10%
of the cut point
7.2mA
(20%)
3.2.7 Impulse Line Connection Orientation
Setup
This function reverses the impulse line orientation.
Follow the procedure below to assign the high
pressure impulse line connection to the L side of the
transmitter.
• Procedure to call up the display
DD and DTM
(excluding EJX_
HART 5[1.2])
[Root Menu] → Basic setup →
EJX_HART 5[1.2]
DTM
Configuration → Pressure Sensor
→
→ H/L Swap Select “Normal” or “Reverse”