Monitoring Trip Events, History, & Conditions
T
roub
leshooting
and Maintenance
6–6
Error Codes
An error code will appear on the display automatically when a fault causes the inverter to trip.
The following table lists the cause associated with the error.
OPE / SRW
Display
Name
Description
Troubleshooting and
Corrective Action
E0 1.-
Over-current
protection
If the motor is constrained
or suddenly accelerated or
decelerated, a high current
will flow in the inverter
and the inverter may fail.
To avoid this problem, the
inverter shuts off its output
and displays the error code
shown on the left when it
detects a current higher
than a specified level. This
protective function uses a
DC current detector (CT)
to detect over-current.
When a current as high as
about 220% of the
inverter's rated output
current is detected, the
protective circuit operates
and the inverter trips.
During
constant
speed
operation
•
Check whether the load has fluctuated
sharply.
•
Check for the short circuit of output
connections (check the output cables).
•
Check for a ground fault (check the
output cables and motor).
OC.Drive
E02.-
Over-current
protection
During
deceleration
•
Check whether the inverter has deceler-
ated the motor quickly increase the decel-
eration time).
OC.Decel
E03.-
Over-current
protection
During
acceleration
•
Check whether the inverter has acceler-
ated the motor quickly (increase the
acceleration time).
•
Check whether the motor has been locked
(check the motor and wiring).
•
Check whether the torque boost current
has been set too high (reduce the boost
current).
OC.Accel
E04.-
Over-current
protection
Other
conditions
•
Check whether the DC braking force is
too high (reduce the braking force).
•
Check whether the current detector (CT)
is normal (replace or repair the CT).
Over.C
E05.-
Overload
protection
(*1) (*4)
This protective function monitors the
inverter output current, and shuts off the
inverter output and displays the error code
shown on the left when the internal
electronic thermal protection circuit
detects a motor overload. If the error
occurs, the inverter will trip according to
the setting of the electronic thermal
function.
•
Check whether the motor load is too high.
(reduce the load factor).
•
Check whether the thermal level is appro-
priate (adjust the level appropriately).
Note:
The electronic thermal protection is
easily triggered when the output frequency is
5 Hz or less. If the moment of inertia of the
load is large, this protective function may
operate when the inverter accelerates the
motor and the acceleration may be disabled.
If this problem occurs, increase the torque
boost current or adjust other settings as
needed.
OL.BRD
E06.-
Braking
resistor
overload
protection
When the BRD operation rate exceeds the
setting of B090, this protective function
shuts off the inverter output and displays
the error code shown on the left.
•
Check whether the inverter has decreased
the motor quickly (increase the decelera-
tion time).
•
Check whether the operation cycle is too
short (prolong the operation cycle)
•
Check whether the set BRD operation
rate is too low (adjust the setting to an
appropriate level).
Note:
Confirm the maximum allowable
capacity of the resistor.
OL.BRD
