Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 57)

Publication 900-UM007D-EN-E - January 2011
Preparations 2-19
When mounting a noise filter on the power supply, make sure to first check the
filter’s voltage and current capacity, and then mount the filter as close as
possible to the Bulletin 900 Controller. Reinforced insulation is applied to the
power supply I/O sections.
Wiring Input/Sensor Devices
Connect sensors to the terminals as follows according to the Input Type and
controller.
Input/Sensor Wiring Considerations
• When the thermocouple leads are extended, make sure to use shielded
thermocouple extension wire matched to the type of thermocouple.
• For a thermocouple, make sure to follow the polarity color code convention.
• If there is a large error in the measurement values, make sure that the correct
sensor type is configured and for thermocouples that input compensation has
been properly configured.
• RTDs can be either 2- or 3-wire types. If a 3-wire type is used, the controller
provides lead wire resistance compensation up to 5 Ω
resistance. If using 24
AWG lead wire, this is approximately 59 m of wire. Use larger gauge wire if
longer length is required.
• For RTDs, the controller source is approximately 1 mA of current.
• If a cooling fan is used in the panel enclosure, prevent only the terminal
block from being cooled when using thermocouples. Otherwise, this may
result in a measurement error.
900-TC16 Input Sensor Wiring
+
−
5
4
3
5
4
3
5
4
3
Thermocouple
Platinum resistance
thermometer
Analog input
+
+
−
V
mA −
−
+
+
−
mA
V
+
−
900-TC8 Input Sensor Wiring
Thermocouple
Platinum resistance
thermometer
Analog input
18
19
20
18
19
20
18
19
20