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Fault
Reason
Does not switch
No power
Faulty signal line
Faulty eletronic insert
• FEL51 (AC) connected directly to
Density of liquid too low
Fork encrusted
Fork corroded
(Inication on Output: red/yellow
flashes, FEL58 (N2): green flashes
0.3 Hz)
FEL51 (AC):Internal resistance of
connected relay too large
FEL51 (AC):Holding current of
connected relay too low
FEL54 (WA):Contacts welded
together (after short-circuit)
Switches incorrectly
Min-/Max-fail-save mode set
wrongly
Sporadic faulty switching
Thick heavy foam, very turbulent
conditions, foaming liquid
Extreme RFI
Extreme vibration
Water in housing
FEL52 (E5): Output overloaded
L1 and N
Remedy
Check power
Check signal line
Exchange
• always connect FEL51 (AC) via
external load
Set density to > 0.5 at electronic
insert
Clean fork
Exchange fork and process
connection
Connect suitable relay
Connected resistor in parallel with
relay
Exchange FEL54 (WA); put fuse in
contact circuit
Set correct mode at electronic insert
Mount Vibracon in bypass
Use screened cable
Decouple, damp, turn fork 90°
Screw cover and cable gland tight
Reduce load, (cable) capacitance
e
Troubleshooting
49
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