6-15
[ 7 ]
0h2
External alarm
Problem
External alarm was inputted (
THR
).
(when
THR
("Enable external alarm trip") is assigned to any of digital input terminals
[X1] through [X3], [FWD], and [REV])
Possible Causes
What to Check and Suggested Measures
(1) An alarm function of
external equipment was
activated.
Check the operation of external equipment.
Remove the cause of the alarm that occurred.
(2) Wrong connection or
poor contact in external
alarm signal wiring.
Check if the external alarm signal wiring is correctly connected to
the terminal to which the
THR
terminal command ("Enable external
alarm trip") has been assigned (Any of E01 through E03, E98, and
E99 should be set to "9.").
Connect the external alarm signal wire correctly.
(3) Incorrect setting of
function code data.
Check if the
THR
terminal command ("Enable external alarm trip")
has been assigned to an unavailable terminal (with E01 through
E03, E98, or E99).
Correct the assignment.
Check whether the normal/negative logic of the external signal
matches that of the
THR
terminal command specified by any of E01
through E03, E98 and E99.
Ensure the matching of the normal/negative logic.
[ 8 ]
0h4
Motor protection (PTC thermistor)
Problem
Temperature of the motor has risen abnormally.
Possible Causes
What to Check and Suggested Measures
(1) The temperature around
the motor exceeded the
motor's specification
range.
Measure the temperature around the motor.
Lower the temperature.
(2) Cooling system for the
motor defective.
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.
Reduce the load (e.g. Use the overload early warning (E34) to
reduce the load before the overload protection is activated.). (In
winter, the load tends to increase.)
Lower the temperature around the motor.
Increase the motor sound (Carrier frequency) (F26).
(4) The activation level
(H27) of the PTC
thermistor for motor
overheat protection was
set inadequately.
Check the thermistor specifications and recalculate the detection
voltage.
Modify the data of function code H27.
(5) Connections and
resistance values of the
PTC thermistor and
pull-up resistor are not
appropriate.
Check the connections and the resistance value.
Correct the connections and replace the resistor with the one
having an appropriate resistance.