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Fault
Reason
Does not switch
No power
(green LED does not light up)
Electronics are defective
Contacts welded together
(after short-circuit)
Measuring transmitter defective
Switches
Inverted measuring transmitter
incorrectly
function
Incorrect setting
of change-over switch for
limit signal in FTL 325 N
Permanent
Switch connected as measuring
alarm signal
transmitter without current
limiting resistors
Interrupt or short-circuit line to
measuring transmitter
Measuring transmitter
electronics defective
Endress+Hauser
Remedy
Check power
Replace FTL 325 N
Replace FTL 325 N;
connect a fuse into contactor circuit
Replace measuring transmitter
Invert output signal on measuring
transmitter
(e.g. set minimum/maximum safety
circuit differently)
Correctly set change-over switch
behind front panel (p. 16...19)
Connect resistors or switch off
alarm signal (p. 17, 19)
Check line
Replace measuring transmitter
electronics
e Trouble-shooting
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