Mitsubishi Electric FR-E800, Instruction Manual

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11. (H) Protective Function Parameters
11.1 Motor overheat protection (electronic thermal O/L relay)
• 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.
• 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.
NOTE
• Make sure to set the parameters according to the temperature characteristic of the motor used.
Parameters referred to
Pr.71 Applied motor

page 340
Pr.72 PWM frequency selection

page 184
Pr.178 to Pr.189 (Input terminal function selection)

page 328
Pr.190 to Pr.196 (Output terminal function selection)

page 292
Output frequency Pr.600
(Pr.692)
Pr.602
(Pr.694)
100%
Pr.603
(Pr.695)
Pr.601
(Pr.693)
Pr.604
(Pr.696)
Load ratio (ratio to Pr.9 ( Pr.51) ) [%]
Continuous operation characteristic
100%
70%
50%
60Hz 30Hz 6Hz
Frequency Frequency
Pr.9 =100% of the rated
motor current
Pr.600 =6Hz
Pr.601 =50%
Pr.602 =30Hz
Pr.603 =70%
Pr.604 =60Hz
50%
100%
60Hz 3Hz 120Hz
60%
Pr.600 =120Hz
Pr.601 =60%
Pr.602 =3Hz
Pr.603 =50%
Pr.604 =60Hz
Load ratio Load ratio
Setting
example 1
Setting
example 2
Outout frequency[Hz]
Pr.600 = 10Hz
Pr.602 = 10Hz
100
80
Pr.603 = 50%
50
Pr.601 = 80%
10
Pr.604 = 10Hz
Load ratio [%]