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Before operation
Electronic thermal relay function operation characteristic
Pr. 9 = 50% setting of inverter rating*1, 2
70
30Hz
or more
*3
20Hz
60
10Hz
6Hz
0.5Hz
50
240
180
120
60
105%
52.5%
50
Inverter output current(%)
(% to the rated inverter 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.
When two or more motors are connected to the inverter, they cannot be protected by the electronic thermal relay
function. Install an external thermal relay to each motor.
When the difference between the inverter and motor capacities is large and the setting is small, the protective
characteristics of the electronic thermal relay function will be deteriorated. In this case, use an external thermal relay.
A special motor cannot be protected by the electronic thermal relay function. Use an external thermal relay.
Electronic thermal relay may not function when 5% or less of inverter rated current is set to electronic thermal relay
setting.
42
Pr. 9 = 100% setting of inverter rating*2
30Hz or more
*3
20Hz
Operation range
10Hz
Range on the right of characteristic curve
6Hz
Non-operation range
Range on the left of characteristic curve
0.5Hz
Characteristic when electronic thermal
relay function for motor protection is turned off
(when Pr. 9 setting is 0(A))
Range for
transistor
protection
100
150
230
This function detects the overload (overheat)
of the motor, stops the operation of the
inverter's output transistor, and stops the
output.
(The operation characteristic is shown on the
left)
When using the Mitsubishi constant-torque
motor
1) Set "1" or any of "13" to "16", "50", "53", "54"
in Pr. 71. (This provides a 100% continuous
torque characteristic in the low-speed range.)
2) Set the rated current of the motor in Pr. 9.
∗1
When a value 50% of the inverter rated output
current (current value) is set in Pr. 9
∗2
The % value denotes the percentage to the
inverter rated output current. It is not the
percentage to the motor rated current.
∗3
When you set the electronic thermal relay
function dedicated to the Mitsubishi constant-
torque motor, this characteristic curve applies
to operation at 6Hz or higher.

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