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XIII.
TROUBLESHOOTING – cont'd
Symptom
TE4 or TE5 No
response Alarm
RS-485 Communication
problem Alarm
NG-SR IOM
Probable Cause
T/C wiring problem
Heater not producing heat
False positive detection
Cable unplugged
Termination resistor problem
Baud rate problem
36
Remedy
Check for shorted wiring
Determine if other alarms are
active
Verify that power is applied to
heater
Verify heater amperage is correct
Reset alarm and monitor
temperature for increase above
150°F in 5 minutes.
Reconnect and verify
Verify resistance is 120 ohms
and connected between RX/TX at
thermocouple module.
Verify middle DIP switch on PLC
is ON.
Verify that baud rate between
PLC and thermocouple module is
same.
PSB INDUSTRIES
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