Thermon TraceNet TCM 18 - Manual (Page 75)

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.
Short 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.
Low Current Readings/Alarms
The following summarizes the possible causes and solutions for heat tracing low
current readings/alarms.
Cause Possible Solutions
Self-regulating or power limiting heater
may be operating at higher than design
pipe temperatures due to processing con-
ditions and thus heaters may be drawing
lower current values. Decrease low current alarm setpoint (if
approved by project engineer).
Loss of a branch of the heat tracing circuit. Measure total current and each branch
current.
Compare to design values.
Check all connections.
Breaker off. Turn breaker back on after conferring with
operations manager.
71 PN 50316_0514