Mitsubishi Electric FR-F820-00077 Instruction Manual page 362

(H) Protective function parameter
Load characteristics setting (Pr. 1481 to Pr. 1487)
● Use Pr. 1481 to Pr. 1485 to set the reference value of load characteristics.
● Use Pr. 1486 "Load characteristics maximum frequency" and Pr. 1487 "Load characteristics mini-
mum frequency" to set the output frequency range for load fault detection.
Load reference 5
Load reference 4
Load reference 3
Load reference 2
Load reference 1
Fig. 5-71:
Automatic measurement of the load characteristics reference
(Load characteristics measurement mode) (Pr. 1480)
NOTES Perform measurement under actual environment with the motor connected.
Set the Pr. 1487 "Load characteristics minimum frequency" higher than the Pr. 13 "Starting fre-
quency".
● Setting Pr. 1480 "Load characteristics measurement mode" = "1" enables automatic measurement
of the load characteristics reference. (Load characteristics measurement mode)
● Use Pr. 1486 and Pr. 1487 to set the frequency band for the measurement, and set Pr. 1480 = "1".
After setting, when the inverter is started, the measurement starts.
● The automatically measured load characteristics reference is written in Pr. 1481 to Pr. 1485.
● After the measurement is started, read Pr. 1480 to display the status of the measurement. If "8"
appears in the tens place, the measurement has not properly completed.
Read value of Pr. 1480
Tens place
—
—
—
—
Tab. 5-84:
5 - 190
Load status
(Pr. 1485)
(Pr. 1484)
(Pr. 1483)
(Pr. 1482)
(Pr. 1481)
f1
(Pr. 1487)
Setting of the load characteristics and output frequency range
Status
Ones place
1 During measurement from the starting point to Point 1
2 During measurement from Point 1 to Point 2
3 During measurement from Point 2 to Point 3
4 During measurement from Point 3 to Point 4
Display of the status of the measurement (Pr. 1480)
f2 f3 f4
Upper limit warning
detection width (Pr. 1488)
Upper limit fault
detection width (Pr. 1490)
Lower limit fault
detection width (Pr. 1491)
Lower limit warning
detection width (Pr. 1489)
Normal load range
f5
Output frequency
(Pr. 1486)
Parameters
I003026E