Yokogawa EJX440A - Manual (Page 21)

IM 01C25T03-01E 3-13
3. OPERATION
(12) Output Status Setup when a Hardware
Error Occurs (D26: ERROR OUT)
This parameter allows the setting of the output status
when a hardware error occurs. The following selections
are available.
(a) BURNOUT DIR; Outputs the corresponding values
of 110% or –5% of output signals according to the
setting by burnout direction switch (BO) on the
CPU board.
(b) HOLD; Outputs the last value held before the error
occurred.
Note: A hardware error means CAP.ERR of AL.01 or AMP.ERR of
AL.02 which are shown in table 4.2 Alarm Message
Summary.
• Example: Set the output status to HOLD when
a hardware error occurs.
ESC
SET
D26:ERROR OUT
BURNOUT DIR
< BURNOUT DIR >
< HOLD >
Use the or key
to select HOLD.
Press the key twice to
enter the setting.
F0326.EPS
Then press the (OK) key.
(13) Bi-directional Flow Measurement Setup
(E30: BI DIRE MODE)
(a) This parameter enables selection of 50% output at
an input of 0 kPa.
Procedure is shown in the figure below.
(b) Combining this with C40: OUTPUT MODE
provides a square root output computed indepen-
dently for 0% to 50% output and for 50% to 100%
output.
• Example: If measurement range is 0 to 10 kPa
(LRV=0 kPa, URV=10 kPa)
The measurement range changes to –10 to 0 to 10 kPa
(output 0% to 50% to 100).
Note that C21: PRES LRV and C22: PRES URV
are not changed.
ESC
SET
E30:BI DIRE MODE
OFF
< OFF >
< ON > Use the or key
to select ON.
Press the key twice to
enter the setting.
F0327.EPS
Then press the (OK) key.
20 mA (100% display)
4 mA (–100% display)
᭹ Output mode “LINEAR”
LRV HRV
F0328.EPS
20 mA (100% display)
Low Cut
4 mA (–100% display)
᭹ Output mode “SQUARE ROOT”
LRV HRV
(14) Range Change while Applying Actual
Inputs (H10: AUTO P LRV, H11: AUTO P
URV)
This feature allows the lower and upper range values to
be set up automatically with the actual input applied. If
the lower and upper range values are set, C21: PRES
LRV and C22: PRES URV are changed at this same
time.
Follow the procedure in the figure below.
The measurement span is determined by the upper and
lower range values. Changing the lower range value
results in the upper range value changing auto-
matically, keeping the span constant.
• Example 1: When changing the lower range
value to 0.5 kPa for the present
setting of 0 to 30 kPa, take the
following action with input pressure
of 0.5 kPa applied.
FEED NO OK
SET
H10:AUTO P LRV
0.5000 kPa
DATA DIAG PRNT ESC
PARAM
H10:AUTO P LRV
0.5000 kPa
H11:AUTO P URV
30.500 kPa
H20:AUTO SP LRV
0.0 MPa
ESC
SET
H10:AUTO P LRV
0 kPa
+ 0
F0329.EPS
The upper range value is changed
keeping the span constant.
Parameters C21 and C22 are
changed at the same time.
Press the key twice.
The lower range value is changed
to 0.5 kPa.
Press the (OK) key.
Note that changing the upper range value does not
cause the lower range value to change but does change
the span.