Mitsubishi Electric FR-F800 Series Instruction Manual page 302

 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.
• 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
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
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Pr.1492
LUP
ON
LDN
E.LDN
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%
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Load status
Pr.1492
ON
ON
Frequency
Upper limit fault detection width (Pr.1490)
Upper limit warning detection width (Pr.1488)
Lower limit warning detection width (Pr.1489)
Pr.1492
Lower limit fault detection width (Pr.1491)
Pr.1492
ON
Output shutoff
ON
Load reference
Pr.1481 = 15%
Pr.1482 = 20%
Pr.1483 = 30%
Pr.1484 = 60%
5.7 (H) Protective function parameter
1
2
3
4
5
6
7
8
9
10
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5. PARAMETERS