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NT579-NT579 RS485
TECSYSTEM SHANGHAI
FAULT DIAGNOSTIC
CAUSES AND REMEDIES
Monitoring unit doesn’t turn on, even if
the terminals are fed.
Connector not well placed inside its
seat. Connection cables are not tight-
ened in the terminal. Burnt out feeder.
Take out and give supply again.
Check the polarity of the power connec-
tion (Page 21 power supply)
One of the three/four channels is in
FAULT for FOC/FCC
Check Pt100 sensor connections.
Possible defective sensor.
Replace the damaged sensor.
When turning on, “ECH” indication ap-
pears
A strong disturbance damaged the
stored dataplease refer paragraph 8.
If this problem should persist, please
contact TECSYSTEM SH Technical De-
partment.
All the Pt100 sensor are in FCC.
Wrong sensor connections. Terminal
box connected inside out.
Check connections and terminal box.
The temperature of the sensors is un-
der –15°C.
All the Pt100 sensor are in FOC.
Wrong sensor connections. Terminal
box connected inside out.
Check connections and terminal box.
The temperature of the sensors is over
230°C.
Temperature indicated by one or more
channels is wrong.
Contact TECSYSTEM SH Technical
Department
Sudden trip of the main switch. Tem-
perature is on standard levels. Just one
channel caused the trip.
Verify through T.MAX function possible
defective sensors.
Replace the sensor. Check the measur-
ing signal terminal box.
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