Mitsubishi Electric 800 Series Instruction Manual page 237

 Overheat protection to match the characteristic of the motor (Pr.600 to
Pr.604, Pr.692 to Pr.696)
• 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.
• The electronic thermal O/L relay's activation level can be set to using the combination of three points (Pr.692, Pr.693),
(Pr.694, Pr.695), (Pr.696, Pr.51) when the RT signal is ON.
Continuous operation characteristic
Load ratio (ratio to Pr.9 (Pr.51)) [%]
100%
Pr.603
(Pr.695)
Pr.601
(Pr.693)
Pr.600
(Pr.692)
Setting
Load ratio
example 1
Pr.9=100% of the rated
motor current
Pr.600=6Hz
Pr.601=50%
Pr.602=30Hz
Pr.603=70%
Pr.604=60Hz
• When setting Pr.600, Pr.602, Pr.604 (Pr.692, Pr.694, Pr.696) to the same frequency, the following graph's upper level will
be applied.
Load ratio [%]
100
80
50
10
NOTE
• Make sure to set the parameters according to the motor temperature characteristic used.
Parameters referred to
Pr.71 Applied motor
Pr.72 PWM frequency selection
Pr.178 to Pr.189 (Input terminal function selection)
Pr.190 to Pr.196 (Output terminal function selection)
236
5. PARAMETERS
5.7 (H) Protective function parameter
Pr.602 Pr.604 Output frequency
(Pr.694) (Pr.696)
100%
70%
50%
6Hz 30Hz 60Hz
Pr.600 = 10Hz
Pr.601 = 80%
Pr.602 = 10Hz
Pr.603 = 50%
Pr.604 = 10Hz
Outout frequency[Hz]
page 351
page 179
Load ratio
Setting
example 2
100%
Pr.600=120Hz
Pr.601=60%
60%
Pr.602=3Hz
50%
Pr.603=50%
Pr.604=60Hz
Frequency
page 343
page 297
3Hz 60Hz 120Hz
Frequency