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Chapter 5 Error Codes
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
detects a current higher than
Overcurrent
a specified level.
protection
This protective function uses
a DC current detector to
detect overcurrent.
When a current as high as
about 220% of the inverter's
rated output current of
constant torque mode is
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 thermal
protection
protection circuit detects a motor overload.
(*1)
If the error occurs, the inverter will trip
according to the setting of the electronic
thermal function.
When the BRD operation rate exceeds the
Braking
setting of "b090", this protective function
resistor
shuts off the inverter output and displays the
overload
error code shown on the right.
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
Overvoltage
a specified level because of an increase in the
protection
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).
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.
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.
Under
The inverter will trip if the DC voltage across
voltage
the P and N terminals exceeds about 175
VDC (in case of the 200 V class models) or
about 345 VDC (in case of the 400 V class
models).
*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
Others
5 - 2
Name
Description
If an error occurs in the internal current
detector (CT), the inverter will shut off its
CT error
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.
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
CPU error (*3)
the right.
Note: Reading an abnormal data from the
EEPROM may result in a CPU error.
If an error occurs in the external equipment
or device connected to the inverter, the
inverter will fetch the error signal and shut
External trip
off its output. (This protective function is
enabled when the external trip function is
enabled.)
A USP error is indicated when the inverter
power is turned on with an input operation
USP error
signal remaining in the inverter. (This
protective function is enabled when the USP
function is enabled.)
When the inverter power is turned on, this
protective function detects the ground fault
Ground-fault
between the inverter output circuit and the
protection (*3)
motor to protect the inverter. (This function
does not operate when a residual voltage
remains in the motor.)
This protective function determines an error
if the input voltage is kept above the
specification level for 100 seconds while the
Input
inverter is stopped.
overvoltage
The inverter will trip if the DC voltage of
protection
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).
If an instantaneous power failure lasts 15 ms
or more, the inverter will shut off its output.
Instanta-
When the power failure duration is long, the
neous power
inverter assumes a normal power-off. If a
failure
restart mode has been selected and an
protection
operation command remains in the inverter,
the inverter will restart after the power is
recovered.
Temperature
The inverter will display the error code
error due to
shown on the right if the lowering of
low
cooling-fan speed is detected at the
cooling-fan
occurrence of the temperature error
speed
described below.
If the main circuit temperature rises because
Temperature
of a high ambient temperature or for other
error
reasons, the inverter will shut off its output.
Display on
digital operator
displayed. Turn off the inverter
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