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Trouble-shooting
56
Fault
Reason
Does not switch
No power
Faulty signal line
Faulty eletronic insert
• AC (FEL 51) connected directly to
L1 and N
Density of liquid too low
Fork encrusted
Fork corroded
(Inication on Output: red/yellow
flashes, N2 (FEL 58): green flashes
0.3 Hz)
AC (FEL 51): Internal resistance of
AC (FEL 51): Holding current of
WA (FEL 54): Contacts welded
Switches
Min-/Max-fail-save mode set wrongly
incorrectly
Sporadic faulty
Thick heavy foam, very turbulent
switching
conditions, foaming liquid
Extreme RFI
Extreme vibration
Water in housing
E5 (FEL 52):
Remedy
Check power
Check signal line
Exchange
• always connect AC (FEL 51) via
external load
Set density to > 0.5 at electronic insert
Clean fork
Exchange fork and process connection
Connect suitable relay
connected relay too
large
Connected resistor in parallel with
connected relay too low
relay
Exchange WA (FEL 54); put fuse in
together (after short-
contact circuit
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
Output overloaded
Reduce load, (cable) capacitance
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