Nextron MASTERTRACE, Operating Manual

Page: 85 / 110

C.2
MASTER TRACE
Appendix C Summary of Alarms
and their Causes
The measured ground fault current is greater than or equal to the Ground Fault Trip
setpoint.
ü
Check that the setpoint is appropriate for the length and type of cable.
ü
Check for wet or damaged heating cable, power connections, splices or tees.
ü
Test for correct ground fault measurement.
For single and dual-point Control Modules, the measured circuit voltage is less than
or equal to the Low Voltage Alarm setpoint.
ü
Check for voltage input failure by measuring the voltage at the input. On internal
switching modules, check the Heater Power In terminals; on external switching mod-
ules, check the Heater Voltage terminals.
ü
Check for breaker trip.
The temperature derived from the RTD resistance is outside the range of values for
Heater Control Temperature.
ü
Check for damaged RTD board mounted on the module, cable or connection if
the RTD BOARD function (msg. S3-14) is set to “On Board ”.
ü
Check for damaged RTD Sampler, Sampler’s address, communication over wire-
less RF Modem/RS485 cable if the RTD BOARD function is set to “RTD Sampler x”.
ü
Check for damaged RTD Transmitter board mounted on the module, cable or
connection if the RTD BOARD function (msg. S3-14) is set to “RTD Transmitter”.
ü
Test the RTD input.
ü
RTD Short Alarm can indicate RTD Board/RTD Sampler/RTD Transmitter failure.
ü
RTD Open Alarm can indicate that a spare heater circuit is enabled.
The phase current is greater than or equal to 0.1 A when the heater circuit is off.
ü
Check for switch failure.
ü
Test the switch input or coil voltage. When the heater circuit is off, the input or
coil voltage should be 0 Vdc. Otherwise the Module needs repair.
One of the following alarms occurred during the TraceCheck™ cycle. Refer to the
alarm details above for the individual alarm.
ü
LOW CURRENT ALARM
ü
HIGH CURRENT ALARM
ü
HIGH CURRENT TRIP
ü
GROUND FAULT ALARM
ü
GROUND FAULT TRIP
ü
SWITCH FAILURE ALARM
For the Group Interface Module, indicates that a Control Module does not respond.
ü
If module does not exist on the data highway remove from the Module List.
ü
Check for damaged RS-485 cable.
ü
Check for Failed Control Module.
A memory or CPU failure has occurred.
ü
If the alarm message occurs on the ML100 Dedicated Interface Module, the
Control Module needs repair.
ü
If the alarm occurs on the MR100 Group Interface Module, the Group Interface
Module needs repair.
Ground fault monitoring function did not detect the GF test current.
ü
Check ground fault current transformer wiring to terminals.
ü
Ground fault current transformer may be faulty.
GROUND FAULT
TRIP
LOW VOLTAGE
ALARM
RTD FAILURE
ALARM
SWITCH FAILURE
ALARM
ALARM DURING
TRACECHECK
NO RESPONSE
ALARM
SELF TEST
FAILURE ALARM
GF TEST
ALARM