Hitachi NES1-004SB Quick Reference Manual page 200

Chapter 9 Error Codes
Name
If an error occurs in the external equipment or
device connected to the inverter, the inverter will
External trip fetch the error 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
USP error 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 motor
protection
to protect the inverter. (This function does not
(*3)
operate when a residual voltage remains in the
motor.)
This protective function determines an error if
Input the input voltage is kept above the specification
overvoltage level for 100 seconds while the inverter is
protection stopped.
Inverter When the thermal sensor in the inverter module
is not function.
thermal
detection
circuit error
If the main circuit temperature rises because of a
Temperature high ambient temperature or for other reasons,
error the inverter will shut off its output.
If instantaneous overcurrent occurs, the main
circuit element temperature is abnormal, or the
main circuit element drive power drops, the
Driver error inverter will shut off its output to protect the main
circuit element. (After tripping because of this
protective function, the inverter cannot retry the
operation.)
Output phase Output phase Loss Logic Detection.(There are
loss undetectable terms of use)
protection
If overload occurs during the motor operation at
a very low speed , the electronic thermal
Low-speed
protection circuit in the inverter will detect the
overload
overload and shut off the inverter output.
protection
(Note that a high frequency may be recorded as
the error history data.)
Operator When the connection between inverter and
connection operator keypad failed, inverter trips and
error displays the error code.
If timeout occurs because of line disconnection
Modbus during the communication in Modbus-RTU
communica- mode, the inverter will display the error code
tion error shown on the right. (The inverter will trip
according to the setting of "C076".)
*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
Description Troubleshooting and corrective action
operator
Check whether an error has occurred in the external
equipment (when the external trip function has been
enabled).
(Recover the external equipment from the error.)
Check whether the inverter power has been turned on
with an input operation signal remaining in the inverter
(when the USP function has been enabled).
(Reset the operation command, and then turn on the
Check for the ground fault.
(Check the output cables and motor.)
Check the inverter itself for abnormality.
(Remove the output cables from the inverter, and then
Check whether the input voltage is high while the
inverter is stopped.
(Lower the input voltage, suppress the power voltage
fluctuation, or connect an AC reactor between the
power supply and the inverter input.)
Check whether the inverter has failed.
Check whether the inverter is installed vertically.
Check whether the ambient temperature is high.
Check the output circuit for a short circuit.
Check for the ground fault.
(Check the output cables and motor.)
Check the heat sink for clogging.
Check for the output phase loss.
(Check theOutput Freq, carrier Freq current output
Check whether the motor load is too high.
Check the operator cable.
Check whether the communication speed setting is
correct.
Check whether the wiring distance is appropriate.
9 - 4
inverter power.)
check the inverter.)
(Replace the inverter.)
(Check the installation.)
(Lower the ambient temperature.)
(Check the output cables.)
(Clean the heat sink.)
cables and motor.)
(Reduce the load factor.)
(Check the connections.)
Reference
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