Mitsubishi Electric 800 Series Instruction Manual (Function page 303

• Setting "8888" in Pr.1481 to Pr.1485 enables fine adjustment of load characteristics. When setting Pr.1481 to Pr.1485 =
"8888" during operation, the load status at that point is set in the parameter (only when the set frequency is within ±2 Hz
of the frequency of the measurement point, and the SU signal is ON).
Frequency(Hz)
f5(Pr.1486)
f1(Pr.1487)
STF＝ON
Pr.1480=1
Measurement start
Read value of Pr.1480
NOTE
• Even if the load measurement is not properly completed, the load characteristics fault is detected based on the load
characteristics found by the already-completed portion of the measurement.
• During the load characteristics measurement, the load characteristics fault detection is not performed.
• During the load characteristics measurement, linear acceleration/deceleration is performed even if the S-pattern acceleration/
deceleration is set.
• 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 the load characteristics reference manually (Pr.1481 to Pr.1485)
• Set Pr.1480 Load characteristics measurement mode = "0" (initial value).
• Set Pr.1486 and Pr.1487 to specify the frequency band for the measurement, and calculate the frequency as the load
characteristics reference (f2 to f4) using the following table.
• Start the inverter operation, and set Pr.1481 = "8888" during operation at the frequency of the load characteristics
reference 1 (f1). The load status at that point is set in Pr.1481 (only when the set frequency is within ±2 Hz of the frequency
of the measurement point, and the SU signal is ON).
• Set load references in Pr.1482 to Pr.1485 in the same way as Pr.1481.
Reference
Load characteristics reference 1
Load characteristics reference 2
Load characteristics reference 3
Load characteristics reference 4
Load characteristics reference 5
NOTE
• When inputting values directly in Pr.1481 to Pr.1485 under V/F control, input the load meter monitored values at the frequency
of each load characteristics reference.
• When inputting values directly in Pr.1481 to Pr.1485 under Advanced magnetic flux vector control, Real sensorless vector
control, Vector control, or PM sensorless vector control, input the motor torque value monitored at the frequency of each load
characteristics reference.
302
12. (H) Protective Function Parameters
12.11 Load characteristics fault detection
Example of starting measurement from the stop state
f4
Load reference 3 recorded
f3
Load reference 2 recorded
f2
Load reference
1 recorded
Pr.41
Pr.1492
1
STF
Y213
SU signal
ON
f1: load characteristics minimum frequency (Pr.1487)
f2 = (f5 - f1)/4 + f1
f3 = (f5 - f1)/2 + f1
f4 = (f5 - f1) × 3/4 + f1
f5: load characteristics maximum frequency (Pr.1486)
Load reference 5 recorded
Load reference 4 recorded
Pr.41
Pr.41
Pr.1492 Pr.1492 Pr.1492
2 3 4
ON
ON
ON ON ON
Frequency
Pr.41
Pr.41
Operation at the
set frequency
Time
Pr.1492
5 0
ON ON
Load reference
Pr.1481
Pr.1482
Pr.1483
Pr.1484
Pr.1485