Omron SYSDRIVE 3G3EV User Manual page 89

Operation
Data
display
%l1
Motor overload (OL1)
The electronic thermal relay actuated
the motor overload protection function.
%l2
Inverter overload (OL2)
The electronic thermal relay actuated
the Inverter overload protection
function.
%l3
Over-torque (OL3)
A current exceeding the value set in
n51 flowed for more than the time set
in n52.
ef1
External fault (EF1)
The Inverter received abnormal input
from external circuits.
Description Cause and action
• Review the load size, V/f characteris-
tics, acceleration/deceleration time,
and cycle time.
• Set the rated motor amperage in
constant No. 31 (electronic thermal
reference current).
• When increasing the output voltage in
the low speed range to increase the
startup torque, the increased voltage
was excessive (V/f characteristics
setting error).
• Decrease the setting of constant No.
30 (minimum output frequency volt-
age).
• The maximum voltage frequency
(FBAS) was set too low (V/f charac-
teristics setting error) and caused
overcurrent.
• Set the maximum voltage frequency
to the rated motor frequency.
• Operated more than one motor with
one Inverter.
• Set constant No. 31 (electronic ther-
mal reference current) to "0.0 (A)."
• Review the load size, V/f characteris-
tics, acceleration/deceleration time,
and cycle time.
• Review the Inverter capacity.
• Check if the n51 and n52 settings are
appropriate.
• Check the machine use status, and
eliminate the cause of the problem.
• Review the external circuits.
• Review the external sequence.
• Check the signal line of multi-function
contact input for disconnection.
Chapter 5
5-7