Technical information

7 – TROUBLESHOOTING
103
Fault Code Description Detailed Description of Fault / Possible Solutions
High voltage above the Over voltage Trip Level parameter setting
(P30/PFN07) was detected for longer than the Over/Under Voltage Trip
delay time (P32/PFN09).
Verify that the actual input voltage level is correct.
F25 High Line L2-L3
Verify that the Rated Voltage parameter (P66/FUN05) is set correctly.
Line power quality problems/ excessive line distortions.
High voltage above the Over voltage Trip Level parameter setting
(P30/PFN07) was detected for longer than the Over/Under Voltage Trip
delay time (P32/PFN09).
Verify that the actual input voltage level is correct.
F26 High Line L3-L1
Verify that the Rated Voltage parameter (P66/FUN05) is set correctly.
Line power quality problems/ excessive line distortions.
The MX has detected the loss of one or more input or output phases when
the starter was running. Can also be caused by line power dropouts.
Check input supply for open fuses.
Check power supply wiring for open or intermittent connections.
Check motor wiring for open or intermittent connections.
On medium voltage systems, verify wiring of the voltage feedback
measurement circuit.
F27 Phase Loss
Check Gate and Cathode connections to MX card
No input voltage was detected for longer than the Inline Configuration
time delay parameter setting (P53/ I/O15) when a start command was
given to the starter.
If an inline contactor is being used, verify that the setting of the Inline
Configuration time delay parameter (P53/ I/O15) allows enough time for
the inline contactor to completely close before the No Line fault occurs.
Check input supply for open disconnects, open fuses, open circuit
breakers or disconnected wiring.
Verify that the SCR gate wires are properly connected to the MX control
card.
F28 No Line
On medium voltage systems, verify wiring of the voltage feedback
measurement circuit.
During operation, the MX detected a very high level of current in one or
more phases.
Check motor wiring for short circuits or ground faults.
Check motor for short circuits or ground faults.
Check if power factor or surge capacitors are installed on the motor side
of the starter.
F30 I.O.C.
(Instantaneous
Overcurrent Current)
Verify that the motor FLA (P1/QST01), CT ratio (P68/FUN03), and
burden switch settings are correct.
Motor current exceeded the Over Current Trip Level setting (P24/PFN01)
for longer than the Over Current Trip Delay Time setting (P25/PFN02).
F31 Overcurrent
Check motor for a jammed or an overload condition.