
12
3. Connections
3-2. Connecting strain gage sensor
3-2-1. About sensor connection terminals
Sensor connection terminals (1, 2) can be used as either
remote sensing terminals or TEDS sensor data terminals. Before
connecting a sensor, you need to set Remote Sense/TEDS (F2-6)
to match the function you are going to use.
The initial setting is 0.Aut: TEDS auto-calibration (disable
remote sense). For detailed information, see the section 6-1-2.
“Remote Sense/TEDS.”
CAUTION
If you want to use a sensor with a 6-wire connection (for
remote sensing), set Remote Sense/TEDS (F2-6) to 2.rSE
(disable TEDS) before connecting the sensor.
3-2-2. About remote sense
The TD-260T uses a 6-wire connection (for remote sensing)
when calibrated at the factory.
Be aware that, if you connect a sensor by using 4 wires, and
then perform an equivalent input calibration, an error may
occur in a reading, resulting from the bridge voltage drop that
is proportionate to the length of the cable extended.
A 6-wire connection (for remote sensing) is excellent for
compensating for a voltage drop caused by the extension
of the cable length or voltage change due to changes in
temperature.
For applications of the TD-260T that may be exposed to
varying temperatures including the use of the device in an
outdoor installation system, or applications of the TD-260T
that require overall accuracy, we recommend the 6-wire
connection that includes remote sensing.
3-2-3. About bridge voltage (excitation voltage)
When you set the bridge voltage, make sure that the output
voltage from the sensor is relatively high, but that it does not
exceed the maximum excitation voltage specified on the
sensor test report at the same time.
Setting a voltage that exceeds the sensor's maximum
excitation voltage may cause the sensor to malfunction.
CAUTION
<
If the sensor's maximum excitation voltage is lower than 10 V,
be sure to set Bridge Voltage (F2-5) to 2.5 before connecting
the sensor.
<
For TEDS calibration, if the bridge voltage setting is higher
than the maximum excitation voltage recorded in the TEDS
memory when TEDS data is loaded, the bridge voltage
setting is automatically changed to a setting equal to or
lower than the maximum excitation voltage..
NOTE
<
The initial setting is 2.5 V.
TEDS sensor & 4-wire connection
A
B
C
D
1
2
4
3
5
6
TD-260T
(-EXC)
(+EXC)
(-SIG)
(+SIG)
(SHIELD)
(TEDS/+SENS)
(GND/-SENS)
7
Teds Data
Memory
Strain Gage Sensor
If you do not use the TEDS function, you do not need to
connect any device to the terminal 1 or 2.
6-wire connection
1
2
4
3
5
6
TD-260T
(-EXC)
(+EXC)
(-SIG)
(+SIG)
(SHIELD)
(TEDS/+SENS)
(GND/-SENS)
7
A
B
C
D
Strain Gage Sensor