Input/Output terminal status
7. Faults and Alarms
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 short circuit or ground fault.
The Load is too large, reduce it ore use larger Inverter.
Check motor FLA rating compared to inverter and V/F setting.
OV
Overvoltage
DC bus voltage has exceeded
detection level.
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.
uV1
Main circuit undervoltage
DC bus voltage is below detection
level.
Check mains power supply voltage and connections.
Check correct supply for Inverter being used.
Monitor for mains dips or interruptions.
OH
Unit overheated
Temperature inside the inverter has
exceeded 110°C.
Refer to manual for installation guidelines and recommendations.
Check cooling fan (if fitted).
Check V/F characteristic ore reduce Carrier frequency.
OL1
Motor overload
The inverter is protecting the motor
from overload based on an internal IT
calculation using n036 setting.
Check and reduce the load.
Check V/F characteristic (V
max
and F
max
).
Increase the running speed of the motor.
Increase acceleration/decelleration times.
EF
*1
*1 Refer to user’s manual for full fault code listings
External fault
An external fault has been input.
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.
SER
(flashing)
Sequence error
Sequence input when inverter
running.
Inverter must be stopped when Local/Remote switching attempted.
Inverter must be stopped when Comms/Remote switching
attempted
bb
(flashing)
External baseblock
An external baseblock command has
been input.
Check your control terminal wiring.
A multi-functional digital input has been set to 12 or 13.
EF
(flashing)
Sequence error has occured
Forward and reverse run signal have been applied simultaneously.
Input Terminal Status
Output Terminal Status
1: Terminal S1 is “closed”
1: Terminal S2 is “closed”
1: Terminal S3 is “closed”
1: Terminal S4 is “closed”
1: Terminal S5 is “closed”
Not Used
1: Terminal MA-MC is “closed”
Not Used
