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*3
When the electronic thermal O/L relay of the Mitsubishi Electric constant-torque motor is set, the characteristic curve is as shown in this diagram
at 6 Hz or higher. (For selection of the operation characteristic , refer to
*4
Transistor protection is activated depending on the temperature of the heatsink. The protection may be activated even with less than 120%
depending on the operating conditions.
NOTE
• The internal accumulated heat value of the electronic thermal relay function is reset to the initial value by the inverter's power
reset or reset signal input. Avoid unnecessary reset and power-OFF.
• Install an external thermal relay (OCR) between the inverter and motors to operate several motors, a multi-pole motor or a
dedicated motor with one inverter. When setting an external thermal relay, note that the current indicated on the motor rating
plate is affected by the line-to-line leakage current. (Refer to
operation. Use a thermal protector or a motor with built-in thermistor.
• The protective characteristic of the electronic thermal O/L relay is degraded when there is a large difference in capacity
between the inverter and motor, and when the set value is small. In such case, use an external thermal relay.
• A dedicated motor cannot be protected by an electronic thermal O/L relay. Use an external thermal relay.
• The transistor protection thermal O/L relay is activated early when the Pr.72 PWM frequency selection setting is increased.
 Electronic thermal O/L relay when using IPM motor (Pr.9)
• This function detects the overload (overheat) of the motor and shut off the inverter output by stopping the operation of the
transistor at the inverter output side.
• Set the rated current (A) of the motor in Pr.9 Electronic thermal O/L relay. Performing IPM parameter initialization
automatically sets the rated current of the IPM motor. (Refer to
• Set "0" in Pr.9 to avoid activating the electronic thermal relay function; for example, when using an external thermal relay
for the motor.
(Note that the output transistor protection of the inverter is activated. (E.THT))
• The following figures show the electronic thermal O/L relay operation characteristics when Mitsubishi Electric IPM motors
are used. The area left of the characteristic curve is the normal operation area, and the area right of the characteristic curve
is the protective function activated area.
MM-EFS (1500 r/min specification), MM-THE4
70
150r/min
500r/min
60
50
240
150r/min
180
500r/min
120
60
0
0
20 40
*1
The % value denotes the percentage to the rated motor current.
254
5. PARAMETERS
5.7 (H) Protective function parameter
750r/min
1125r/min
1500r/min
750r/min
1125r/min
1500r/min
60 80 100 120 140 160 180 200
Inverter output current (%)∗1
page
362.)
page
84.) The cooling effect of the motor drops during low-speed
page
177.)
MM-EFS (3000 r/min specification)
70
300r/min
1000r/min
60
50
240
300r/min
180
1000r/min
120
60
0
0
20 40
60 80 100 120 140 160 180 200
Inverter output current (%)∗1
1500r/min
2250r/min
3000r/min
1500r/min
2250r/min
3000r/min

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