FAULTS AND REMEDY
CARD G / FIT 82 V 6.15 E / April 2010
18.2 FAULTS WITHOUT DISPLAY TEXT
FIT-display remains dark after switching on the main power switch.
No external power supply. Check the main power supply to the unit.
External fuses too small or external shortage. Check for short circuit and fuse sizes.
The LED on 24V DC power supply unit [1G12] is
off.
Short circuit on the 24V DC side of the power
supply unit; disconnect wires from 24V DC
connectors; if LED shines again, follow wires
and remedy short circuit.
Check 220...230V AC supply to the power
supply unit; restore supply – if necessary
No 24V DC power even when the wires on the
24V DC side of the power supply unit [1G12] are
disconnected and 220...230V AC supply is
available.
Replace the power supply unit.
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