EN-22
8. Faults and alarms
Note: Refer to user’s manual for full fault code listings
Fault Display Fault name and meaning Possible cause and remedy
OC Overcurrent
Output current is higher than 250% of
inverter rated current.
Check output for shortcircuit or ground fault.
The load is too large, reduce it or use larger
inverter. Check motor FLA rating compared to
inverter and V/f setting.
OV Overvoltage
DC bus voltage has exceeded detec-
tion level.
Load inertia is too large and the motor is re-
generating. Increase deceleration time (n020
or n022).
Connect an external braking resistor and set
n092 to 1. Check braking resistor and wiring.
UV1 Main circuit undervoltage
DC bus voltage is below detection
level.
Check mains power supply voltage and con-
nections. Check correct supply for inverter be-
ing used.
Monitor for mains dips or interruptions.
OH Unit overheat
Temperature inside the inverter has
exceeded 110°C
Refer to manual for installation guidelines and
recommendations. Check cooling fan (if fit-
ted). Check V/f characteristic or reduce carrier
frequency.
OL1 Motor overload
The inverter is protecting the motor
from overload, based on an internal
I
2
t calculation using n036 setting.
Check and reduce the load.
Check V/f characteristic (Vmax and Fmax).
Increase the running speed of motor.
Increase acceleration/deceleration times.
EF External fault
An external fault has been input.
Check your control terminal wiring.
A multi-function digital input has been set to 3
or 4. Run signal has to be removed before this
can be reset.
SER
(flashing)
Sequence error
Inverter received LOCAL / REMOTE
selection command, or communica-
tion / control circuit selection com-
mand signal during operation.
Check sequence and make sure that LOCAL /
REMOTE selection or communication / control
circuit selection command is not set during op-
eration.
bb
(flashing)
External Baseblock
An external baseblock command has
been input.
Check your control terminal wiring.
A multi-function digital input has been set to
12 or 13.
EF
(flashing)
Sequence error
Sequence Error has occurred.
Forward and reverse run signal have been
applied simultaniously. Check sequence and
make sure that FORWARD and REVERSE
Run is not set at the same time.
I43-EN-01+V7+Quick_Guide.book Seite 22 Dienstag, 25. April 2006 8:56 08
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