Yokogawa EJX440A - Manual (Page 19)

IM 01C25T03-01E 3-11
3. OPERATION
d. Setting Static Pressure Unit and Scale
(D30: SP UNIT, D33: SP LRV, and D34: SP
URV)
Static pressure can be displayed in measured input
static pressure or in %, independent from the 4-20 mA
output signal of measured pressure or differential
pressure. These parameters allow the entry of the static
pressure unit and scale to be displayed.
Note that the parameter D37: SP SELECT can be used
to select either the high or low pressure side of the
capsule to monitor the static pressure.
(7) Unit Setup for Displayed Temperature
(D40: TEMP UNIT)
When the instrument is shipped, the temperature units
are set to
degC . Follow the procedure below to
change this setting. Note that changing the unit here
changes the unit for A30: CAPSULE TEMP (capsule
temperature) and J45: AMP TEMP (amplifier tempera-
ture).
• Example: Change the unit for the temperature
display degC to degF.
ESC
SET
D40:TEMP UNIT
degC
< degC >
< degF >
< K > Use the or key to
select degF.
Press the key twice to
enter the setting.
F0321.EPS
Then press the (OK) key.
(8) Operation Mode Setup
(D22: REV OUTPUT)
This parameter allows the direction of the 4-20 mA
output to be reversed with respect to input. Follow the
procedure below to make this change.
• Example: Change 4 to 20 mA output to 20 to
4 mA output.
ESC
SET
D22:REV OUTPUT
NORMAL
< NORMAL >
< REVERSE> Use the or key
to select REVERSE.
Press the key twice to
enter the setting.
F0322.EPS
Then press the (OK) key.
(9) Impulse Line Connection Orientation
Setup (D15: H/L SWAP)
This function reverses the impulse line orientation.
Follow the procedure below to make this change.
• Example: Assign the high pressure impulse
line connection to the L side of
the transmitter.
ESC
SET
D15:H/L SWAP
NORMAL
< NORMAL >
< REVERSE> Use the or key
to select REVERSE.
Press the key twice to
enter the setting.
F0323.EPS
Then press the (OK) key.
(10) CPU Failure Burnout Direction and Hard-
ware Write Protect (D25: BURNOUT)
There are two slide switches on the CPU assembly
board. One sets the burnout direction at CPU failure,
and the other sets a write protection function which
disables parameter changes through the use of a
handheld terminal or some other communication
method.
HIGH LOW
CPU assembly
Slide switch
Burnout direction switch
Write protection switch
Write Protection
Switch Position
Burnout Direction
Switch Position
BO H L
WR E D
H L
E D
H L
E D
H L
E D
H L
E D
Hardware write protection switch (WR)
Burnout direction switch (BO)
Burnout Direction
Write Protection
YES
(Write disabled)
NO
(Write enabled)
F0324.EPS
The parameter of D25: BURNOUT displays the status
of 4-20 mA DC output if a CPU failure occurs. In case
of a failure, communication is disabled.