Mitsubishi Electric FR-D720-0.2K-G, Instruction Manual

Page: 107 / 302

104
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.
• 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 Refer to page 164.
Pr. 128 PID action selection Refer to page 216.
Pr. 178 to Pr. 182 (input terminal function selection) Refer to page 117.
Pr. 190, Pr. 192 (output terminal function selection) Refer to page 123.
Rotation speed
Pr.600 Pr.602
100%
Pr.603
Pr.601
Pr.604
Load ratio (ratio to
Pr.9
) [%]
Continuous operation characteristic
100%
70%
50%
3000 1500 300 Rotation speed
(r/min)
Rotation speed
(r/min)
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
50%
100%
1500 150 3000
60%
Pr.600 =3000r/min
Pr.601 =60%
Pr.602 =150r/min
Pr.603 =50%
Pr.604 =1500r/min
Load ratio Load ratio
Setting example 1 Setting example 2
Rotation speed (r/min)
Pr.600 =500r/min
Pr.602 =500r/min
100
80
Pr.603 =50%
50
Pr.601
=80%
500
Pr.604 =500r/min
Load ratio [%]