Mitsubishi Electric FR-E800, Instruction Manual

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11. (H) Protective Function Parameters
11.11 Load characteristics fault detection
 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.
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.
 Load fault detection setting (Pr.1488 to Pr.1491)
• When the load is deviated from the detection width set in Pr.1488 Upper limit warning detection width , the Upper limit
warning detection (LUP) signal is output. When the load is deviated from the detection width set in Pr.1489 Lower limit
warning detection width , the Lower limit warning detection (LDN) signal is output. At the same time, the Load fault
warning (LDF) appears on the operation panel.
• For the LUP signal, assign the function by setting "211" (positive logic) or "311" (negative logic) in any parameter from
Pr.190 to Pr.196 (Output terminal function selection) . For the LDN signal, assign the function by setting "212" (positive
logic) or "312" (negative logic) in any parameter from Pr.190 to Pr.196 (Output terminal function selection) .
• When the load is deviated from the detection width set in Pr.1490 Upper limit fault detection width , the protective
function (E.LUP) is activated and the inverter output is shut off. When the load is deviated from the detection width set in
Pr.1491 Lower limit fault detection width , the protective function (E.LDN) is activated and the inverter output is shut off.
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%
0
20
40
60
80
100
120
0 10 20 30 40 50 60 70 Frequency(Hz)
Load(%)
26