Thermon TraceNet TCM 18 User Manual

Page 54

CIRCUIT = 12

HEATER SETUP

HEATER = ENABLED

RTD SETUP =2

PIPE ❚

Figure 25: Select RTD Setup

With the circuit 12 now set up as a 2 RTD convention and with both of the RTDs
installed in the appropriate RTB6 modules and the two ribbon cables connected into
the back of the TCM18 into the RTD1/RC2 and RTD2/RC2 slots, the new set up is
complete. With a dual RTD setup, the control RTD will be the sensor which is read-
ing the lowest temperature. It will control the pipe, vessel or equipment within the
range of the MAINTAIN TEMP and the MAINTAIN TEMP plus the CONTROL BAND.
The second higher reading RTD will be used to turn off the heat tracing circuit in
the event of that sensor reading being a value in excess of the HIGH TEMP ALARM
value.

TIP:

If most of the circuits on a TCM18 have a single RTD input, use the program

ALL feature to first configure each circuit as a “1 PIPE” control convention. Next
select the circuits where dual RTDs are to be used and program them individually
using the 2-PIPE convention.

PN 50316_0514