Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 29)

3. OPERATION
IM 01C50T01-01E 3-16
Example: To adjust using a voltmeter.
Procedures
1. Call up the “Scaled D/A trim” display. [1.Device
setup
→
2.Diag/Service
→
3.Calibration
→
4.AO
D/A Trim
→
2.Scaled D/A trim]
2. Press OK[F4] to set the transmitter to manual mode .
3. Select “2. Change” and press ENTER[F4] .
4. Enter the value read on the meter when the signal is
4 mA. In this case, enter the value of the voltage
across the 250
Ω
resistor (1V) and press
ENTER[F4] .
5. Enter the value read on the meter when the signal is
20 mA. In this case, enter the value of the voltage
across the 250
Ω
resistor (5V) and press
ENTER[F4] .
6. Select “1. Proceed” and press ENTER[F4] .
7. Connect voltmeter and press ENTER[F4] .
8. Press OK[F4] to make the transmitter output 4
mA(0%) . Check the reading on the voltmeter, and
enter this value using the key pad.
9. Next, press OK[F4] to make the transmitter output
20 mA (100%) . Check the reading on the voltme-
ter, and enter this value using the key pad.
10. After completing the above steps, return the
transmitter to automatic control.
3.5.8 Sensor Backup (For Model
YTA320 only)
The sensor backup command sets the transmitter to
automatically use Sensor2 as output if Sensor1 fails.
When the sensor backup mode is activated, the
transmitter will output the Sensor1 which is mapped as
PV. Sensor2 is mapped as SV. If sensor1 fails, the
transmitter starts Sensor Backup operation and
Sensor2(SV) is output in place of PV. There’s no
disruption in 4 to 20 mA output. The Error code for
sensor1 failure is shown on an Integral Indicator, if it
is specified. Error message is sent to the HART
communicator that the sensor1 failed and the sensor
backup mode has started. In backup operation, even if
the Sensor1 recovers, the transmitter will continue to
use Sensor2 until the backup operation is reset by
parameter or power is turned off. If Sensor2 fails
during backup operation, the transmitter will send an
error code for Sensor2 failure to the Integral Indicator
and HART communicator and output the “Sensor
burnout” value.
● To enable Sensor backup function
1. Set the sensor type, wire and unit for Sensor1 and
2. (See 3.4.1)
Any Sensor type except “Non-connection” can be
selected.
2. Map Sensor1 as PV , and Sensor2 as SV . (See
3.4.2)
TV and 4V can be set to any designated value
except for “Sensor1” and “Sensor2” from the
selection. Sets damping time constant and unit for
each process variable.
3. Set the sensor burnout type to High, Low or user
setting value.
If the sensor burnout type is set to "off", the sensor
failure will not be detected and the backup function
will not act.
4. Send all the setting data to a transmitter.
5. Call up the “Snsr Backup” display. [1.Device setup
→
4.Detailed Setup
→
1.Sensors
→
4.Snsr Backup
→
1.Snsr Bkup]
6. Select Sensor Backup “Enable”. Press ENTER[F4] .
● To make the transmitter return to using
Sensor1 in Backup Operation
1. Confirm that the Sensor1 is recovered
2. Call up the “Bkup Return Snsr1” parameter.
[1.Device setup
→
4.Detailed Setup
→
1.Sensors
→
4.Snsr Backup
→
3.Bkup Return Snsr1]
3. Press OK[F4] . Backup status returns to “Waiting.”
NOTE
Don’t change the sensor type, wire and setting
of PV and SV while Sensor Backup mode is
“Enable.” When the change is necessary, turn
Sensor Backup mode “Disable” before changing.
3.5.9 Burst Mode
The transmitter continuously sends the data stored in it
when the burst mode is set ON. The data is sent
intermittently as a digital signal with 75ms intervals
when the transmitter is set in the burst mode. There-
fore, communications with the HART communicator is
also possible.
Any one of the following values can be selected.
PV
% range/current:
Output in % and mA
Process vars/ crnt: Output in mA and Process
variables (PV, SV, TV and
4V)