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6-15
[ 7 ]
0h2
Alarm issued by an external device
Problem
External alarm was inputted (
THR
).
(when "Enable external alarm trip"
THR
is assigned to one of digital input terminals
[X1] through [X5], [FWD], and [REV])
Possible Causes
What to Check and Suggested Measures
(1) An alarm function of the
external equipment was
activated.
Inspect external equipment operation.
Î
Remove the cause of the alarm that occurred.
(2) Connection has been
performed incorrectly.
Check if the wire for the external alarm signal is correctly connected
to the terminal to which the "Alarm from external equipment" has
been assigned (Any of E01, E02, E03, E04, E05, E98, and E99 is
set to "9.").
Î
Connect the wire for the alarm signal correctly.
Check if the "Alarm from external equipment" has not been
assigned to an unused terminal (E01, E02, E03, E04, E05, E98, or
E99).
Î
Correct the assignment.
(3) Incorrect settings.
Check whether the assignment (normal/negative logic) of the
external signal agrees with that of thermal command
THR
set by
E01, E02, E03, E04, E05, E98, and E99.
Î
Ensure that the polarity matches.
[ 8 ]
0h4
Motor protection (PTC thermistor)
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.
Î
Lower the temperature.
(2) Cooling system for the
motor malfunctioned.
Check if the cooling system of the motor is operating normally.
Î
Repair or replace the cooling system of the motor.
(3) Load was too heavy.
Measure the output current.
Î
Lighten the load (e.g., lighten the load before overload occurs
using E34 (Overload Early Warning). (In winter, the load tends to
increase.).
Î
Lower the temperature around the motor.
Î
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.
Î
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.
Î
Correct the connections and replace the resistor with one with an
appropriate resistance.