User Manual

Chapter 9 Error Codes
9 - 4
Name Description
Display on digital
operator
Troubleshooting and corrective action
Reference
page
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.)
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.)
-
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.)
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
inverter power.)
7-57
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.)
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 the inverter.)
7-76
11-4
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.
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.)
-
Inverter
thermal
detection
circuit error
When the thermal sensor in the inverter module
is not function.
Check whether the inverter has failed.
(Replace the inverter.)
-
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.
Check whether the inverter is installed vertically.
(Check the installation.)
Check whether the ambient temperature is high.
(Lower the ambient temperature.)
-
Driver error
If instantaneous overcurrent occurs, the main
circuit element temperature is abnormal, or the
main circuit element drive power drops, the
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.)
Check the output circuit for a short circuit.
(Check the output cables.)
Check for the ground fault.
(Check the output cables and motor.)
Check the heat sink for clogging.
(Clean the heat sink.)
5-7
Output phase
loss
protection
Output phase Loss Logic Detection.(There are
undetectable terms of use)
Check for the output phase loss.
(Check theOutput Freq, carrier Freq current output
cables and motor.)
7-76
Low-speed
overload
protection
If overload occurs during the motor operation at
a very low speed , the electronic thermal
protection circuit in the inverter will detect the
overload and shut off the inverter output.
(Note that a high frequency may be recorded as
the error history data.)
Check whether the motor load is too high.
(Reduce the load factor.)
-
Operator
connection
error
When the connection between inverter and
operator keypad failed, inverter trips and
displays the error code.
Check the operator cable. -
Modbus
communica-
tion error
If timeout occurs because of line disconnection
during the communication in Modbus-RTU
mode, the inverter will display the error code
shown on the right. (The inverter will trip
according to the setting of "C076".)
Check whether the communication speed setting is
correct.
Check whether the wiring distance is appropriate.
(Check the connections.)
8-4
*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.