6-13
[ 7 ]
0h2
External alarm input
Problem External alarm was inputted (THR).
Possible Causes What to Check and Suggested Measures
(1) An alarm function of the
external equipment was
activated.
Inspect external equipment operation.
Remove the cause of the alarm that occurred.
(2) Connection has been
performed incorrectly.
Check if the wire for the external alarm signal is correctl
connected to the terminal to which the "Alarm from external
equipment" has been assigned.
Connect the wire for the alarm signal correctly.
(3) Incorrect settings. Check if the "Alarm from external equipment" has not been
assigned to an unassigned terminal.
Correct the assignment.
[ 8 ]
0h4
PTC thermistor for motor protection
Problem Temperature of the motor rose abnormally.
Possible Causes What to Check and Suggested Measures
(1) Temperature around the
motor exceeded that of
motor specifications.
Measure the temperature around the motor.
Decrease the temperature.
Lighten the load.
(2) Cooling system for the
motor malfunctioned.
Check if the cooling system of the motor is operating normally.
Repair or replace the cooling system of the motor.
(3) Load was too heavy. Measure the output current.
Lighten the load (e.g., lighten the load before overload
occurs using the overload early warning (E34) function).
Decrease the temperature around the motor.
Increase the motor sound (carrier frequency) (F26).
(4) The set activation level
(H27) of the PTC
thermistor for motor
overheat protection was
inadequate.
Check the thermistor specifications and recalculate the
detection voltage.
Reconsider the data of function code H27.
(5) A PTC thermistor and
pull-up resistor were
connected incorrectly or
the resistance was
inadequate.
Check the connection and the resistance of the pull-up resistor.
Correct the connections and replace the resistor with one
with an appropriate resistance.
(6) The value set for the
torque boost (F09) was
too high.
Check the data of function code F09 and readjust the data so
that the motor does not stall even if you set the data to a lowe
value.
Readjust the data of the function code F09.
(7) The V/f pattern did not
match the motor.
Check if the base frequency (F04) and rated voltage at base
frequency (F05) match the values on the nameplate on the
motor.
Match the function code data to the values on the nameplate
of the motor.
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