Protective And Diagnostic Functions - Omron 3G3JV Series Quick Start Manual

Protective and Diagnostic Functions

Fault Display Fault name and meaning
OC Overcurrent
Output current is higher than
250% of Inverter rated current.
OV Overvoltage
DC bus voltage has exceeded
detection level.
uV1 Main circuit undervoltage
DC bus voltage is below
detection level.
OH Unit overheated
Temperature inside the inverter
has exceeded 110°C.
OL1 Motor overload
The Inverter is protecting the motor
from overload based on an internal
I≈T calculation using n036 setting.
EF* External fault
An external fault has been input.
SER Sequence error
(flashing) Sequence input when Inverter
running.
bb External baseblock
(flashing) An external baseblock command
has been input.
EF Sequence error has occurred
(flashing)
Note: Refer to Section 7-2 for full fault code listings.
Improper procedures can result in personal injury or
equipment damage. Use the Quick Start Guide only if you
are familiar with standard safety precautions common to
variable speed drives. See Operation Manual I528 for
further details.
Possible cause and remedy
Check output for short circuit 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 regenerating.
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 connections.
Check correct supply for Inverter being used.
Monitor for mains dips or interruptions.
Refer to manual for installation guidelines and recommendations.
Check cooling fan (if fitted).
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 the motor.
Increase acceleration/deceleration times.
Check your control terminal wiring.
A multi-functional digital input has been set to 3 or 4.
Run signal must be removed before this can be reset.
Inverter must be stopped when Local/Remote switching
attempted.
Inverter must be stopped when Comms/Remote switching
attempted.
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
simultaneously.