Faults And Alarms - Omron V7-IP65 Quick Start Manual

8. Faults and alarms

Fault Display
OC Overcurrent
Output current is higher than 250% of
inverter rated current.
OV Overvoltage
DC bus voltage has exceeded detec-
tion level.
UV1 Main circuit undervoltage
DC bus voltage is below detection
level.
OH Unit overheat
Temperature inside the inverter has
exceeded 110°C
OL1 Motor overload
The inverter is protecting the motor
from overload, based on an internal
2
I t calculation using n036 setting.
EF External fault
An external fault has been input.
SER Sequence error
(flashing) Inverter received LOCAL / REMOTE
selection command, or communica-
tion / control circuit selection com-
mand signal during operation.
bb External Baseblock
(flashing) An external baseblock command has
been input.
EF Sequence error
(flashing) Sequence Error has occurred.
Note: Refer to user's manual for full fault code listings
EN-22
Fault name and meaning Possible cause and remedy
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.
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.
Check mains power supply voltage and con-
nections. Check correct supply for inverter be-
ing used.
Monitor for mains dips or interruptions.
Refer to manual for installation guidelines and
recommendations. Check cooling fan (if fit-
ted). Check V/f characteristic or reduce carrier
frequency.
Check and reduce the load.
Check V/f characteristic (Vmax and Fmax).
Increase the running speed of motor.
Increase acceleration/deceleration times.
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.
Check sequence and make sure that LOCAL /
REMOTE selection or communication / control
circuit selection command is not set during op-
eration.
Check your control terminal wiring.
A multi-function digital input has been set to
12 or 13.
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.