Mitsubishi Electric FR-A820-00046 Instruction Manual page 514

(H) Protective function parameter
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.
Setting
example 1
Pr. 9 = 100% of the rated
motor current
Pr. 600 = 6 Hz
Pr. 601 = 50 %
Pr. 602 = 30 Hz
Pr. 603 = 70 %
Pr. 604 = 60 Hz
Fig. 5-131:
Continuous operation characteristic
Load ratio (ratio to Pr. 9 (Pr. 51)) [%]
● 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
NOTE Make sure to set the parameters according to the motor temperature characteristic used.
Parameters referred to
Pr. 71
Pr. 72
Pr. 178 to Pr. 189
Pr. 190 to Pr. 196
5 - 312
Load ratio
Setting examples
100%
Pr. 603
(Pr. 695)
Pr. 601
(Pr. 693)
Pr. 600 Pr. 602 Pr. 604
(Pr. 692) (Pr. 694) (Pr. 696)
80
50
Output frequency [Hz]
10
Applied motor
PWM frequency selection
(input terminal function selection)
(output terminal function selection)
Load ratio
Setting
example 2
Pr. 600 = 120 Hz
Pr. 601 = 800 %
Pr. 602 = 3 Hz
Pr. 603 = 50 %
Pr. 604 = 80 Hz
Frequency [
Fig. 5-132:
Overheat protection setting
Output
frequency
Fig. 5-133:
Overheat protection setting example
Pr. 600 = 10 Hz
Pr. 601 = 80 %
Pr. 602 = 10 Hz
Pr. 603 = 50 %
Pr. 604 = 10 Hz
Parameters
Frequency
I002833E
I002586E
I002587E
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