Faults And Alarms - YASKAWA Varispeed V7 Series Quick Start Manual

8. Faults and alarms

Fault Fault name and meaning
Display
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 detec-
tion 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 I
n036 setting.
EF External fault
An external fault has been input.
SER Sequence error
(flashing) Sequence input when inverter is
running.
bb External Baseblock
(flashing) An external baseblock com-
mand has been input.
EF Sequence error has occurred Forward and reverse run signal have been
(flashing)
Note: Refer to user's manual for full fault code listings
2
t calculation using
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
beeing 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 car-
rier frequency.
Check and reduce the load.
Check V/f characteristic (Vmax and Fmax).
Increase the running speed of motor.
Increas 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.
Inverter has to 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.
applied simultaniously.
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