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Chapter 5
5.1 Error Codes and Troubleshooting
5.1.1 Error Codes
Name
Description
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 right when it
Overcurrent
detects a current higher
protection
than a specified level.
This protective function uses
a DC current detector (CT) to
detect overcurrent.
When a current as high as
about 220% of the inverter's
rated
output
current
detected,
the
protective
circuit operates and the
inverter trips.
This protective function monitors the inverter
output current, and shuts off the inverter
output and displays the error code shown on
Overload
the right when the internal electronic
protection
thermal protection circuit detects a motor
(*1)
overload.
If the error occurs, the inverter will trip
according to the setting of the electronic
thermal function.
Braking
When the BRD operation rate exceeds the
resistor
setting of "b090", this protective function
overload
shuts off the inverter output and displays the
protection
error code shown on the right.
If the DC voltage across the P and N terminals
rises too high, an inverter failure may result.
To avoid this problem, this protective
function shuts off the inverter output and
displays the error code shown on the right
when the DC voltage across the P and N
Overvoltage
terminals exceeds a specified level because of
protection
an increase in the energy regenerated by the
motor
or
the
input
operation).
The inverter will trip if the DC voltage across
the P and N terminals exceeds about 400 VDC
(in case of the 200 V class models) or about
800 VDC (in case of the 400 V class models).
When an internal-EEPROM is caused by
external noise or an abnormal temperature
EEPROM
rise, the inverter shuts off its output and
error
displays the error code shown on the right.
(*2) (*3)
Note: An EEPROM error may result in a CPU
error.
*1 The inverter will not accept any reset command within about 10 seconds after tripping (i.e., after the protective function operates).
*2 The inverter will not accept any reset command after an EEPROM error occurs with error code
power once. If error code "E08" is displayed when the inverter power is turned on subsequently, the internal memory device may have failed
or parameters may have not been stored correctly. In such cases, initialize the inverter, and then re-set the parameters.
*3 The inverter will not accept reset commands input via the RS terminal or entered by the STOP/RESET key. Therefore, turn off the inverter
power.
Display on digital
operator
During
constant-
speed
operation
During
deceleration
During
acceleration
is
Others
voltage
(during
Display on remote
Troubleshooting and corrective action
operator
Check whether the load has fluctuated sharply.
Check for the short circuit of output connections.
OC.Drive
Check for the ground fault.
(Check the output cables and motor.)
Check whether the inverter has decelerated the
motor quickly.
OC.Decel
Check whether the inverter has accelerated the
motor quickly.
Check whether the motor has been locked.
OC.Accel
Check whether the torque boost current has been
set too high.
Check whether the DC braking force is too high.
Over.C
Check whether the current detector (CT) is normal.
Check whether the motor load is too high.
Check whether the thermal level is appropriate.
Note:
The electronic thermal protection is easily triggered
when the output frequency is 5 Hz or less. If the
Over.L
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.
Check whether the inverter has decreased the
motor quickly.
Check whether the operation cycle is too short.
Check whether the set BRD operation rate is too
low.
OL.BRD
(Adjust the setting to an appropriate level.)
Note: confirm the maximum allowable capacity of
the resistor.
Check whether the inverter has decreased the
motor quickly.
Check for a ground fault.
Over.V
(Check the output cables and motor.)
Check whether the motor has been rotated by the
action of the load.
Check for the noise sources located near the
inverter.
Check whether the cooling efficiency has
deteriorated.
EEPROM
(Check the heat sink for clogging, and clean it.)
5-1
Error Codes
Reference
(Eliminate the load fluctuation.)
(Check the output cables.)
(Increase the deceleration time.)
(Increase the acceleration time.)
(Check the motor and wiring.)
(Reduce the boost current.)
(Reduce the braking force.)
(Replace or repair the CT.)
(Reduce the load factor.)
(Adjust the level appropriately.)
(Increase the deceleration time.)
(Prolong the operation cycle.)
(Increase the deceleration time.)
(Reduce the regenerative energy.)
(Remove noise sources.)
(Replace the cooling fan.)
displayed. Turn off the inverter
page
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4-10
4-31
4-10
4-31
4-21
4-38
4-10
4-44
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