Chapter 5 Error Codes
5 - 2
5.1 Error Codes and Troubleshooting
5.1.1 Error Codes
Name Description
Display on
digital operator
During
constant-
speed
operation
During
deceleration
During
acceleration
Overcurrent
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 right when it
detects a current higher
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 is detected, the
protective circuit operates
and the inverter trips.
Others
Overload
protection
(*1)
This protective function monitors the
inverter output current, and shuts off the
inverter output and displays the error code
shown on the right 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.
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
right.
Overvoltage
protection
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 terminals exceeds a specified
level because of an increase in the energy
regenerated by the motor or the input
voltage (during 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).
EEPROM
error
(*2) (*3)
When an internal-EEPROM is caused by
external noise or an abnormal
temperature rise, the inverter shuts off its
output and displays the error code shown
on the right.
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 displayed. Turn off the
inverter 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.
Name Description
Display on
digital operator
Undervoltage
If the inverter input voltage drops, the
control circuit of the inverter cannot
function normally. Therefore, the inverter
shuts off its output when the input
voltage falls below a specified level.
The inverter will trip if the DC voltage
across the P and N terminals exceeds
about 175 VDC (in case of the 200 V
class models) or about 380 VDC (in case
of the 400 V class models).
CT error
If an error occurs in the internal current
detector (CT), the inverter will shut off its
output and display the error code shown
on the right. The inverter will trip when
the CT outputs about 0.6 V or more at
power-on.
CPU error
(*3)
If the internal CPU malfunctions or an
error occurs in it, the inverter will shut off
its output and display the error code
shown on the right.
Note: Reading an abnormal data from
the EEPROM may result in a CPU error.
External trip
If an error occurs in the external
equipment or device connected to the
inverter, the inverter will fetch the error
signal and shut off its output. (This
protective function is enabled when the
external trip function is enabled.)
USP error
A USP error is indicated when the
inverter power is turned on with an input
operation signal remaining in the
inverter. (This protective function is
enabled when the USP function is
enabled.)
Ground-fault
protection
(*3)
When the inverter power is turned on,
this protective function detects the
ground fault between the inverter output
circuit and the motor to protect the
inverter. (This function does not operate
when a residual voltage remains in the
motor.)
Input
overvoltage
protection
This protective function determines an
error if the input voltage is kept above
the specification level for 100 seconds
while the inverter is stopped.
The inverter will trip if the DC voltage of
the main circuit is kept above about 390
VDC (in case of the 200 V class models)
or about 780 VDC (in case of the 400 V
class models).
Instanta-
neous power
failure
protection
If an instantaneous power failure lasts 15
ms or more, the inverter will shut off its
output.
When the power failure duration is long,
the inverter assumes a normal power-off.
If a restart mode has been selected and
an operation command remains in the
inverter, the inverter will restart after the
power is recovered.
Temperature
error due to
low
cooling-fan
speed
The inverter will display the error code
shown on the right if the lowering of
cooling-fan speed is detected at the
occurrence of the temperature error
described below.
Temperature
error
If the main circuit temperature rises
because of a high ambient temperature
or for other reasons, the inverter will shut
off its output.
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