Mitsubishi Electric FR-D720-0.2K-G Instruction Manual page 107

Selection and protection of a motor
(5) Overheat protection to match the characteristic of the motor (Pr.600 to Pr.604)
• The activation level of the electronic thermal O/L relay can be varied to match the motor temperature characteristic.
• The electronic thermal O/L relay's activation level can be set using the combination of three points (Pr.600, Pr.601), (Pr.602,
Pr.603), (Pr.604, Pr.9). Two or more points are required for setting.
Continuous operation characteristic
Load ratio (ratio to Pr.9) [%]
100%
Pr.603
Pr.601
Pr.600 Pr.602
Setting example 1
Pr.9 =100% of the rated motor current
Pr.600 =300r/min
Pr.601 =50%
Pr.602 =1500r/min
Pr.603 =70%
Pr.604 =3000r/min
Load ratio
100%
70%
50%
300 1500
• When setting Pr.600, Pr.602, Pr.604 to the same speed, the following graph's upper level will be applied.
NOTE
 Make sure to set the parameters according to the motor temperature characteristic used.
Parameters referred to
Pr. 79 Operation mode selection
Pr. 128 PID action selection
Pr. 178 to Pr. 182 (input terminal function selection)
Pr. 190, Pr. 192 (output terminal function selection)
104
Pr.604
Rotation speed
Setting example 2
Pr.600 =3000r/min
Pr.601 =60%
Pr.602 =150r/min
Pr.603 =50%
Pr.604 =1500r/min
Load ratio
100%
3000 Rotation speed
(r/min)
Load ratio [%]
100
80
50
500
Refer to page 164.
Refer to page 216.
60%
50%
150 1500
Pr.600 =500r/min
Pr.601 =80%
Pr.602 =500r/min
Pr.603 =50%
Pr.604 =500r/min
Rotation speed (r/min)
Refer to page 117.
Refer to page 123.
Rotation speed
3000
(r/min)