Mitsubishi Electric FR-A800 Series Instruction Manual page 442

• 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 SU signal is in the ON state.)
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 or Advanced magnetic flux vector control, input the
load meter value monitored at each reference frequency.
• When inputting values directly in Pr.1481 to Pr.1485 under Real sensorless vector control, Vector control, or PM sensorless
vector control, input the motor torque value monitored at each reference frequency.
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Example of starting measurement from the stop state
Frequency(Hz)
f5(Pr.1486)
f4
f3
Load reference 2 recorded
f2
Load reference
1 recorded
f1(Pr.1487)
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)
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Load reference 5 recorded
Load reference 4 recorded
Load reference 3 recorded
Pr.41
Pr.41
Pr.41
Pr.1492 Pr.1492 Pr.1492
2 3
ON
ON
ON ON
Frequency
Pr.41
Pr.41
Pr.1492
4 5 0
ON ON ON
Load reference
Pr.1481
Pr.1482
Pr.1483
Pr.1484
Pr.1485
5.10 (H) Protective function parameter
1
2
3
4
Operation at the
set frequency
5
Time
6
7
8
9
10
441
5. PARAMETERS