Error Codes And Troubleshooting - Hitachi L700 SERIES Quick Reference Manual

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
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 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
Overload shown on the right when the internal
protection electronic thermal protection circuit
(*1) detects a motor overload.
If the error occurs, the inverter will trip
according to the setting of the electronic
thermal function.
When the BRD operation rate exceeds
Braking
the setting of "b090", this protective
resistor
function shuts off the inverter output and
overload
displays the error code shown on the
protection
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 terminals exceeds a specified
Overvoltage
level because of an increase in the energy
protection
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
EEPROM temperature rise, the inverter shuts off its
error output and displays the error code shown
(*2) (*3) 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
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.
Display on
digital operator
During
constant-
speed
operation
During
deceleration
During
acceleration
Others
5 - 2
Name Description
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.
Undervoltage
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 345 VDC (in case
of the 400 V class models).
If an error occurs in the internal current
detector (CT), the inverter will shut off its
output and display the error code shown
CT error
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
CPU error its output and display the error code
(*3) shown on 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
External trip
signal and shut 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 signal remaining in the
USP error
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
protection circuit and the motor to protect the
(*3) 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
Input while the 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,
neous power
the inverter assumes a normal power-off.
failure
If a restart mode has been selected and
protection
an 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
Temperature because of a high ambient temperature
error or for other reasons, the inverter will shut
off its output.
Display on
digital operator
displayed. Turn off the