Mitsubishi Electric FR-F820-00046 Instruction Manual page 285

Fr-f800 series
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• To prevent the repetitive on/off operation of the signal due to load fluctuation near the detection range, Pr.1492 Load
status detection signal delay time / load reference measurement waiting time can be used to set the delay time. Even
when a fault is detected out of the detection range once, the warning is not output if the characteristics value returns to the
normal range from a fault state within the output delay time.
Load reference
LUP
LDN
E.LDN
LDF warning indication
NOTE
• Changing the terminal assignment using Pr.190 to Pr.196 (Output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
 Setting example
• The load characteristics are calculated from the parameter setting and the output frequency.
• A setting example is as follows. 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
Load characteristics reference 1
Load characteristics reference 2
Load characteristics reference 3
Load characteristics reference 4
Load characteristics reference 5
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 319
Pr.190 to Pr.196 (Output terminal function
284
5. PARAMETERS
5.7 (H) Protective function parameter
Load status
Pr.1492
ON
ON
f1: Load characteristics minimum frequency (Pr.1487) = 10 Hz
f2 = (f5 - f1)/4 + f1 = 22.5 Hz
f3 = (f5 - f1)/2 + f1 = 35 Hz
f4 = (f5 - f1) × 3/4 + f1 = 47.5 Hz
f5: Load characteristics maximum frequency (Pr.1486) = 60 Hz Pr.1485 = 100%
Load(%)
120
100
80
60
40
26
20
0
0
10
20
selection)page 312
Pr.1492
Pr.1492
ON
ON
Output shutoff
ON
ON
Frequency
30
40
50
60
Upper limit fault detection width (Pr.1490)
Upper limit warning detection width (Pr.1488)
Lower limit warning detection width (Pr.1489)
Lower limit warning detection width (Pr.1491)
Pr.1492
Load reference
Pr.1481 = 15%
Pr.1482 = 20%
Pr.1483 = 30%
Pr.1484 = 60%
70
Frequency(Hz)

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