Yokogawa EJX930A - Manual (Page 24)

<3. Parameter Setting>
3-14
IM 01C25R05-01EN
3.4.8 Simulation and Squawk
NOTE
Flow Simulation Mode, and Device Variable
Simulation Function continue for a given holding
time, then is released automatically. Even if the
configuration tool power supply is turned off or
the communication cable is disconnected, the
test output will continue for that time.
The holding time can be selected from 10 min*,
30 min, 60 min, 3 hour, 6 hour or 12 hour.
*: Default value.
• Procedure to call up the display
[Root Menu] → Diag/Service → Test
→ Test Auto Release Time
(1) Flow Simulation Mode
The pseudo values instead of using actual
measurements of differential pressure, static
pressure, and external temperature can be used.
This is called “flow simulation mode.”
The output value becomes the simulation value and
the LCD continuously displays the simulation value
and alarm (AL.90 SIM) in alternating sequence.
F0306.ai
Select the desired simulation mode from the list
below, and set the unit and value.
• Procedure to call up the display
[Root Menu] → Detailed setup → Flow Simulation →
→ Flow
Simulation
Mode
(Select the
combination
of pseudo
variables)
Off: –
ON: DP Differential pressure only
ON: SP Static pressure only
ON: DP
SP
Differential pressure and
static pressure
ON: ET External temperature only
ON: DP
ET
Differential pressure and
external temperature
ON: SP
ET
Static pressure and external
temperature
ON: DP
SP
ET
Differential pressure, static
pressure and external
temperature
Check
Flow
Calc
Differential pressure, static
pressure, and external
temperature without
damping
→ Flow Sim
Pres Unit
Select the unit for the differential
pressure
→ Flow Sim
Pres
Set the differential pressure value for
simulation
It is similar about SP and ET.
NOTE
The output process value while simulation
can be monitored by LCD and through
communication as follows.
Process value Output value
DP Simulation value according to
simulation mode
SP Simulation value according to
simulation mode
ET Simulation value according to
simulation mode
Following function is reflected while simulation.
Simulation
value
Function
DP/SP/ET Measuring Range (LRV/URV)
Alarm
Status Output
Damping Time*
DP Low Cut Mode
*: When “Check Flow Calc” is selected, damping is ignored.
If one of the following alarm occurs while
simulation, all of the output data are held to the
value before alarm occurs.
AL.01 (CAP. ERR)
AL.02 (AMP. ERR)
AL.03 (ET. ERR)