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EN-21
Troubleshooting
General Faults and Alarms
Faults and Alarms indicate unsusal inverter / application conditions.
An alarm does not necessarily switch off 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
anymore.
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
BUS
Option Com Err
Option Card Communication Alarm
After initial communication was established, the
connection was lost.
Check the connections and all user-side soft-
ware configurations.
CF
Out of Control
Control Fault
A torque limit was reached continuously for 3
seconds or longer during a deceleration stop in
Open Loop Vector control
Check the motor parameters
CPF00
COM-
ERR(OP&INV)
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.
CPF01
COM-
ERR(OP&INV)
CPF02
BB Circuit Err
CPF02 Fault
Baseblock circuit error
• Perform an initialization to factory defaults.
• Cycle the Inverter power supply.
• Replace the Inverter.
CPF03
EEPROM Error
CPF03
EEPROM error
CPF04
INternal A/D Err
CPF04
CPU Internal A/D Converter Fault
DEV
Speed Deviation
F1-04 = 0, 1 or 2 and A1-02 = 1 or 3
The speed deviation has been greater than the
setting in F1-10 for a time longer than the setting
F1-11.
• Reduce the load.
• Lengthen the acceleration and deceleration
time
• Check the mechanical system
• Check the settings of F1-10 and F1-11
• Check the sequence and if the brake is
opened when the inverter starts to increase
the speed.
F1-04 = 3 and A1-02 = 1 or 3
The speed deviation has been greater than the
setting in F1-10 for a time longer than the setting
F1-11.
EF
External Fault
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.
EF0
Opt External Flt
External fault input from Communications
Option Card
• Check for an external fault condition.
• Verify the parameters.
• Verify communication signals
EFx
Ext Fault Sx
External fault at terminal Sx (x stands for termi-
nals S3 to S7)
Eliminate the cause of the external fault con-
dition.
Ext Run Active
Cannot Reset
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.
GF
Ground Fault
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
without 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.