Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 540 / 1218

(H) Protective function parameter Parameters
5 - 338
Setting example
●
The load characteristics are calculated from the parameter setting and the output frequency.
●
A setting example is shown below. The reference value is linearly interpolated from the parameter
settings. For example, the reference when the output frequency is 30 Hz is 26%, which is linearly
interpolated from values of the reference 2 and the reference 3.
Reference Frequency Load reference
Load characteristics reference 1
f1: load characteristics minimum frequency
(Pr. 1487) = 10 Hz
Pr. 1481 = 15%
Load characteristics reference 2 f2 = (f5 - f1)/4 + f1 = 22.5 Hz Pr. 1482 = 20%
Load characteristics reference 3 f3 = (f5 - f1)/2 + f1 = 35 Hz Pr. 1483 = 30%
Load characteristics reference 4 f4 = (f5 - f1) × 3/4 + f1 = 47.5 Hz Pr. 1484 = 60%
Load characteristics reference 5
f5: load characteristics maximum frequency
(Pr. 1486) = 60 Hz
Pr. 1485 = 100%
Tab. 5-128: Setting example for load reference
I003029E
Fig. 5-148: Reference value when the output frequency is 30 Hz
NOTE When the load reference is not set for five points, the load characteristics value is determined by
linear interpolation of the set load reference values only. If there is only one load reference setting,
the set load reference is used as the load reference all through the range.
Parameters referred to
Pr. 41 Up-to-frequency sensitivity => page 5-390
Pr. 190 to Pr. 196 (Output terminal function selection) => page 5-378
0
20
40
60
80
100
120
0 10 20 30 40 50 60 70
26
Load [%]
Frequency [Hz]