Mitsubishi Electric 800 Series Instruction Manual (Function page 284

• The electronic thermal O/L relay operation level can be set with 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.602 Pr.604
(Pr.692) (Pr.694) (Pr.696)
Setting
Load ratio
example 1
100%
Pr.9=100% of the rated
70%
motor current
Pr.600=6Hz
50%
Pr.601=50%
Pr.602=30Hz
Pr.603=70%
Pr.604=60Hz
6Hz
• When setting Pr.600, Pr.602, Pr.604 (Pr.692, Pr.694, Pr.696) to the same frequency, the following graph's upper level is
applied.
Load ratio [%]
100
80
50
10 Outout frequency[Hz]
NOTE
• Make sure to set the parameters according to the temperature characteristic of the motor used.
Parameters referred to
Pr.71 Applied motorpage 380
Pr.72 PWM frequency selectionpage 221
Pr.178 to Pr.189 (Input terminal function
Pr.190 to Pr.196 (Output terminal function
Output frequency
example 2
Pr.600=120Hz
Pr.601=60%
Pr.602=3Hz
Pr.603=50%
Pr.604=60Hz
30Hz 60Hz
Frequency
Pr.600 = 10Hz
Pr.601 = 80%
Pr.602 = 10Hz
Pr.603 = 50%
Pr.604 = 10Hz
selection)page 368
selection)page 332
Load ratio
Setting
100%
60%
50%
3Hz
12. (H) Protective Function Parameters
12.1 Motor overheat protection (electronic thermal O/L relay)
Frequency
60Hz 120Hz
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17
18
19
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