Thermon TraceNet TCM 18 - Manual (Page 72)

RTD Sensor Alarm
The following summarizes some of the possible causes and solutions for a heat trac-
ing RTD sensor reading alarm.
Cause Possible Solutions
RTD connections are wired improperly or
have become loose. Confirm wiring and connections are cor-
rect.
RTD has failed open or has extremely
high resistance or RTD has failed shorted
or has very low resistance. Perhaps lightning has damaged the sen-
sor?
Maybe the piping has had some
welding going on nearby? Maybe the RTD
has gotten wet? Replace RTD.
Communications Alarm
The following summarizes some of the possible causes and solutions for heat trac-
ing communications alarms.
Cause Possible Solutions
Improperly set controller address, dupli-
cate addresses, or improper configuration
of firmware/software. Change controller address or re-configure
firmware/software.
Loose or open connection in RS485 line. Recheck for continuity in all communica-
tion lines.
Too many modules in network. Check network limitations versus actual
configuration.
Too long of an accumulated communica-
tion distance. Consider the addition of a repeater.
Too many reflections of signal usually
caused by improper terminations in net-
work. Add termination resistors as appropriate.
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