Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 72)

A2-3
IM 01C50T02-01E
(1) Making the Input Sensor Settings
Access the parameter SENSOR_TYPE_1 and set the
type of sensor to be connected as sensor 1.

Access the parameter SENSOR_CONNECTION_1
and set the number of connection wires of the sensor to
be connected as sensor 1 as follows:
2: For a 2-wire sensor, such as a thermocouple,
voltage input, 2-wire RTD, and 2-wire resistance
input
3: For a 3-wire sensor, such as a 3-wire RTD and
3-wire resistance input
4: For a 4-wire sensor, such as a 4-wire RTD and
4-wire resistance input
Do the same as above for the sensor 2 input.
When connecting a 4-wire sensor to the sensor
input 1, sensor input 2 is not available. Set
SENSOR_TYPE_2 to Non-Connection.
IMPORTANT
4-wire sensor cannot be assigned to Sensor 2.
(2) Setting Up Limit Switches
Set up limit switches 1 to 4. The values and
statuses of limit switches can be read as outputs of
DI blocks. The chart below outlines the procedure to
set up limit switch 1.
Access the parameter LIMSW_1_TARGET and select
the value to be monitored by limit switch 1:
0 = PRIMARY_VALUE_1 (sensor 1 input)
1 = PRIMARY_VALUE_2 (sensor 2 input)
2 = SECONDARY_VALUE (terminal board
temperature)
3 = DIFFERENTIAL_VALUE (temperature
difference between sensor 1 and 2 inputs)
4 = AVERAGE_VALUE (average temperature of
sensor 1 and 2 inputs)
5 = BACKUP_VALUE (backup input)

Access the parameter LIMSW_1_ACT_DIRECTION
and select the type of limit switch 1:
0 = HI LIMIT (high-limit switch)
1 = LO LIMIT (low-limit switch)

Access the parameter LIMSW_1_SETPOINT and set
the threshold of turning on limit switch 1. As necessary,
the hysteresis can be set in the parameter LIMSW_1_
HYSTERESIS (input of only a positive number is valid).
Do the same for limit switches 2 to 4 as necessary.
(3) Making LCD Display Settings
Select the AI blocks whose output values you want
to display on the LCD and set the display refresh
cycle. The parameters related to LCD display
settings include those that determine whether to
hide the error and warning codes from the LCD,
and enable and disable the address indications.
Access the parameter DISPLAY_AI_OUT and set a
number to select the AI blocks whose output values
you want to display on the LCD. When two or more AI
blocks are selected, their outputs are displayed in turn
cyclically.
0 = Display the output of AI1
1 = Display the output of AI2
2 = Display the output of AI3
3 = Display the output of AI4
4 = Display the outputs of AI1 and AI2
5 = Display the outputs of AI1, AI2, and AI3
6 = Display the outputs of AI1, AI2, AI3, and AI4

Access the parameter DISPLAY_CYCLE and set the
desired display cycle from 2 to 255 seconds. DISPLAY_
CYCLE is set to 2 seconds by default. Increase the
setting as appropriate such as when the response of
the LCD is slow due to a cold ambient temperature.
(4) Carrying Out Input Calibration
Since the YTA320 is calibrated at the factory before
shipment, calibration need not be performed
after delivery; however, the user can carry out
a calibration by applying arbitrary input levels
as appropriate. For a thermocouple input, cold
junction compensation is performed for the input
level. To carry out a precise calibration, follow
the procedure below to switch off the CJC prior to
calibration. After the calibration, be sure to switch
back on the CJC. This CJC switching procedure is
not necessary for inputs other than a thermocouple.
Access the parameter CJC_SELECT_1 and set 1.
0 = Cold junction compensation based on the
terminal board temperature
1 = Cold junction compensation based on a constant

Access the parameter CONSTANT_CJC_TEMP_1 and
set 0 (disable CJC).
This disables CJC for the sensor 1 input. After
calibration, return the CJC_SELECT_1 setting to
0. The following outlines the calibration procedure
for the sensor 1 input. Do the same for the sensor
2 input.