32
NT935 ETH
TROUBLESHOOTING
CAUSES AND
SOLUTIONS
The control unit does not switch on and the
supply to terminals 40-42 is correct.
Check that: the connector is correctly inserted into its housing, the
wires are tightened, there is no evidence of burning on the
connectors. Disconnect the power supply, carry out the above and
reconnect.
CH4 is in FAULT because of FOC
(only the 3 Pt100 sensors are connected)
Programming error of the CH4 / YES control unit.
Check and repeat
programming as per page 13-14, select CH4 / NO.
One of the three/four channels is in FAULT due
to FOC/FCC
Check the connections of the Pt100 sensors, check the instructions
given in the paragraphs:
measurement signal transfer and
temperature sensor diagnostics on page 14-15.
When turning on, the display shows
“ECH”
Strong interference damaged the stored data. See the paragraph
Programmed data diagnostics on page 16.
All the PT100 sensors are in FCC.
Incorrect sensor connection, the terminal block has been inserted
upside down.
Check the connections and the terminal board.
The temperature shown by one or more
channels is wrong.
Contact the
TECSYSTEM Technical Department.
Sudden trip of the main switch. The temperature
is on standard levels. Just one channel has
caused the trip.
Check the temperatures recorded in T-MAX, check the instructions
given in the paragraphs:
measurement signal transfer and
temperature sensor diagnostics on page 16. Activate the FCD
function.
FCD warning
See the FCD function on page 31.
Contact
TECSYSTEM Technical Department if the problem persists.
European directives 2012/19/EC (WEEE) and 2011/65/EC (RoHS) have been approved to reduce electrical and
electronic waste and promote the recycling and reuse of the materials and components of said equipment, cutting down
on the disposal of the residues and harmful components of electrical and electronic materials.
All the electrical and electronic equipment supplied after 13 August 2005 is marked with this symbol, pursuant to
European directive 2002/96/EEC on electrical and electronic waste (WEEE). Any electrical or electronic
equipment marked with this symbol must be disposed of separately from normal domestic waste.
Returning used electrical devices: contact TECSYSTEM or your TECSYSTEM agent for information on the correct
disposal of the devices.
TECSYSTEM is aware of the impact its products have on the environment and asks its customers active support in the
correct and environmentally-friendly disposal of its devices.
TECHNICAL INFORMATION
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