EN-21
Troubleshooting
General Faults and Alarms
Faults and Alarms indicate unsusal inverter / application conditions.
An alarm does not necessarily switch of the inverter but a message is displayed on the keypad (i.e. a
flashing alarm code) and an alarm output can be generated at the multi-function outputs (H2-01 and
H2-02) if programmed. An alarm automatically disappears if the alarm condition is not present any-
more.
A fault switches the inverter output off immediately, a message is displayed on the keypad and the
fault output is switched. The fault must be reset manually after the cause and the RUN signal have
been removed.
The following table shows a list of faults and alarms with their corrective actions.
Display
Alarm
Fault
Meaning
Corrective Actions
Option Card Communication Alarm
After initial communication was established, the
connection was lost.
Check the connections and all user-side soft-
ware configurations.
Digital Operator Communication Fault 1/2
• Communication fault between Operator and
Inverter
• CPU External RAM Fault
• Disconnect the Digital Operator and then
connect it again.
• Cycle the Inverter power supply.
• Replace the Inverter.
CPF02, CPF03, CPF04 Fault
• Baseblock circuit error
• EEPROM error
• CPU Internal A/D Converter Fault
• Perform an initialization to factory defaults.
• Cycle the Inverter power supply.
• Replace the Inverter.
Forward/Reverse Run Commands Input
Together
Both the forward and the reverse run commands
are input simultaneously for 500ms or more.
This alarm stops the motor.
Check external sequence logic, so that only
one input is activated at a time.
External fault input from Communications
Option Card
• Check for an external fault condition.
• Verify the parameters.
• Verify communication signals
External fault at terminal Sx (x stands for terminals S3
to S7)
Eliminate the cause of the external fault condi-
tion.
Detected after a fault when a RESET command
is input while the RUN command is still active
Remove the RUN signal first and reset the
error.
Ground Fault
The ground current at the Inverter output
exceeded 50% of the Inverter rated output cur-
rent and L8-09=1 (Enabled).
• Remove the motor and run the Inverter with-
out the motor.
• Check the motor for a phase to ground
short.
• Check the output current with a clampmeter
to verify the DCCT reading.
• Check the control sequence for wrong motor
contactor signals.
Loss of Load
Loss of motor load according to the settings of
L6-01 to L6-03 has been detected.
• Make sure that the settings in L6-02 and L6-
03 are appropriate.
• Check the mechanical system (mechanical
connection of the load, e.g. belt).
Over Current
The Inverter’s output current exceeded the over-
current detection level.
• Remove the motor and run the Inverter with-
out the motor.
• Check the motor for a phase-to-phase short.
• Verify the accel/decel times (C1-
).
• Check the Inverter for a phase-to-phase
short at the output.
Heatsink Overheat
L8-03 = 0,1 or 2 and the temperature of the
Inverter's cooling fin exceeded the L8-02 value.
• Check for dirt build-up on the fans or heat-
sink.
• Reduce the ambient temperature around the
drive.
• Replace the cooling fan(s).
Inverter's Cooling Fan Stopped
L8-03 = 3 or 4 and the temperature of the
Inverter's cooling fin exceeded the L8-02 value.
