Mitsubishi Electric FR-F700PJ Instruction Manual page 125

Selection and protection of a motor
(2) Electronic thermal O/L relay operation under 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 86)
 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))
MM-EFS
70
150r/min
500r/min
60
50
240
150r/min
180
500r/min
120
60
0
0 20 40 60 80 100 120 140 160 180 200
Inverter output current (%)*
*The % value denotes the percentage to the rated motor current.
NOTE
 Protective function by electronic thermal relay function is reset by inverter power reset and reset signal input. Avoid
unnecessary reset and power-OFF.
120
750r/min
1125r/min
1500r/min
750r/min
1125r/min
1500r/min
Range for transistor
protection
 Operation range: Range on the right of characteristic curve
 Non-operation range: Range on the left of characteristic curve
MM-EF
70
180r/min
600r/min
60
50
240
180r/min
180
600r/min
120
60
0
0 20 40 60 80 100 120 140 160 180 200
Inverter output current (%)*
IPM IPM IPM
900r/min
1350r/min
1800r/min
900r/min
1350r/min
1800r/min
Range for transistor
protection