CLS200 Series User’s Guide
Chapter 2: Installation
33
INPUT + TERMINAL COMMON REFERENCE COMMON*
Input 9 2 6 17
Input 10 4 6 17
Input 11 8 6 17
Input 12 10 6 17
Input 13 14 12 17
Input 14 16 12 17
Input 15 20 12 17
Input 16 22 12 17
*
For sixteen-loop controllers when mixing current inputs and low-voltage inputs (thermocouples or voltage inputs less than
1V), connect the current signal to the positive input and reference common (terminal TB1-17). If no low-voltage sensors are
used, connect current inputs to the positive input and common terminals listed in the table above.
Input Wiring Recommendations
Use multicolored stranded shielded cable for analog inputs. Watlow recommends that you use
20 AWG wire (0.5 mm
2
). If the sensor manufacturer requires it, you can also use 24 or 22 AWG
wiring (0.2 mm
2
). Most inputs use a shielded twisted pair; some require a 3-wire input.
Follow the instructions pertaining to the type(s) of input(s) you are installing.
The controller accepts the following inputs without any special scaling resistors:
• J, K, T, S, R, B and E thermocouples.
• Linear inputs with ranges between -10 and 60mV.
Any unused inputs should be set to SKIP or jumpered to avoid thermocouple break alarms.
Thermocouple Connections
Connect the positive lead of any of the supported thermocouple types to the IN+ terminal for one of
the loops and the negative lead to the corresponding IN- terminal.
Use 18 or 20 AWG (0.5 or 0.75 mm
2
) for all the thermocouple inputs. Most thermocouple wire is
solid, unshielded wire. When using shielded wire, ground one end only.
White
Red
CH IN+
*CH IN-
Shield (if present)
Earth Ground
at Process End
*For sixteen-channel models connect negative to Com on TB1
Type J
thermocouple
Figure 2.13 — Thermocouple Connections
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