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Selection and protection of a motor
(2) Electronic thermal relay of IPM motor control (Pr.9)
This function detects the overload (overheat) of the motor and trips the inverter by stopping the operation of the
transistor at the inverter output side. (The operation characteristic is shown below.)
⋅ Set the rated current [A] of the motor in Pr.9.
Performing IPM parameter initialization automatically sets the rated current of the IPM motor. (Refer to page 81)
⋅ Set "0" in Pr.9 when you do not want to activate the electronic thermal relay function. An example for this case is
when using an external thermal relay for the motor. (Note that the output transistor protection of the motor is
activated. (E.THT))
* The % value denotes the percentage to the rated motor current.
⋅ 30K or lower ⋅ 37K or higher
CAUTION
⋅ Protective function by electronic thermal relay function is reset by inverter power reset and reset signal input. Avoid
unnecessary reset and power-OFF.
IPM
IPM
IPM
9Hz
20Hz
50Hz
70Hz
90Hz
50
60
70
0
60
120
180
240
0 20 40 60 80 100 120 140 160 180 200
(s) unit display in this range
(min) unit display in this range
Operation time (min)Operation time (s)
Inverter output current (%)*
Operation range
Range on the
right of
characteristic
curve
Non-operation
range
Range on the left
of characteristic
curve
0
60
120
180
240
0 20 40 60 80 100 120 140 160 180 200
50
60
70
12Hz
40Hz
60Hz
90Hz
120Hz
(s) unit display in this range
(min) unit display in this range
Operation time (min)
Operation time (s)
Inverter output current (%)*