Thermon TraceNet TCM 18 - Manual (Page 77)

Field heater wiring is improperly labeled
and/or connected such that the heater
and the circuit number are not matched. Trace out the circuit wiring from the field
back into the panel and subsequently to
the controller. Wherever possible, turn the
circuit “off” and “on” and watch for an ap-
propriate response. If this is the problem,
re-do the wiring.
Open circuit in a series resistance circuit. Disconnect heater from power, meg be-
tween each of the conductors and ground
for proper dielectric rating. If okay, mea-
sure resistance of circuit for agreement
with design values.
High Ground Current Alarm
The following summarizes some of the possible causes and solutions for heat trac-
ing high ground current alarm.
Cause Possible Solutions
Heat tracing is damaged. Disconnect heat tracing circuit and deter-
mine if alarm clears. If so, repair heat trac-
ing.
Wiring to heat tracing had high leakage
current. Disconnect heat tracing and sequentially
disconnect power wiring until the alarm
ceases. Check last section removed for
damage.
Improper wiring of current sense wires
through toroid. The current sensing toroid must have the
outgoing heater current lead and the re-
turn current heater lead run through the
toroid for a proper ground leakage mea-
surement. Redo wire routing if only one
wire has been run through the current
sensing toroid.
73 PN 50316_0514