Mitsubishi Electric 800 Series Instruction Manual page 268

Frequency(Hz)
f5(Pr.1486)
f4
f3
f2
f1(Pr.1487)
STF=ON
Pr.1480=1
Measurement start
Read value of Pr.1480
STF
Y213
SU signal
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, input the load meter value monitored at each reference frequency.
Example of starting measurement from the stop state
Load reference 4 recorded
Load reference 3 recorded
Load reference 2 recorded
Pr.41
Load reference
1 recorded
Pr.41
Pr.1492 Pr.1492
1 2
ON
ON
ON ON
Frequency
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
Pr.41
Pr.41
Pr.1492 Pr.1492 Pr.1492
3 4 5
ON ON ON
Pr.1481
Pr.1482
Pr.1483
Pr.1484
Pr.1485
Pr.41
Operation at the
set frequency
Time
0
ON
Load reference
5. PARAMETERS
5.7 (H) Protective function parameter
3
4
5
5
5
6
7
8
9
10
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