Offline Auto Tuning For An Induction Motor - Mitsubishi Electric FR-A800 Series Instruction Manual

Inverter
FR-A820-[] FR-A840-[]
00046 (0.4K) 00023 (0.4K)
00077(0.75K) 00038(0.75K)
00105(1.5K) 00052(1.5K)
00167(2.2K) 00083(2.2K)
00250(3.7K) 00126(3.7K)
00340(5.5K) 00170(5.5K)
00490(7.5K) 00250(7.5K)
00630(11K) 00310(11K)
00770(15K) 00380(15K)
00930(18.5K) 00470(18.5K)
01250(22K) 00620(22K)
01540(30K) 00770(30K)
01870(37K) 00930(37K)
02330(45K) 01160(45K)
03160(55K) 01800(55K)
03800 (75K) or 02160 (75K) or
higher higher
*1 Pr.71 = "0, 2 to 6, 20, 23, 24, 40, 43, or 44" (standard motor)
*2 Pr.71 = "1, 13 to 16, 50, 53, or 54" (constant-torque motor)
*3 Pr.71 = "70, 73, or 74" (SF-PR)
NOTE
• When the Pr.0 and Pr.12 settings are changed from their initial values, the automatic change is not performed.
• When the SF-PR motor is selected (Pr.71 = "70, 73, or 74"), the output current may become large due to a small load by setting
Pr.81 Number of motor poles according to the number of the SF-PR motor poles.
• When the SF-PR motor is used, the output current tends to increase compared with the case where the SF-JR or SF-HR motor
is used. Depending on the load conditions, the output current may increase even though the torque boost value has been
automatically changed. When the protective function such as the electronic thermal O/L relay (E.THT, E.THM) or stall
prevention (OL, E.OLT) is activated, adjust the Pr.0 Torque boost according to the load.
CAUTION
• Make sure to set this parameter correctly according to the motor used. Incorrect setting may cause the motor and the
inverter to overheat and burn.
Parameters referred to
Pr.0 Torque boostpage 706
Pr.12 DC injection brake operation
Pr.14 Load pattern selectionpage 708
Pr.96 Auto tuning setting/statuspage 532
Pr.100 to Pr.109 (Adjustable 5 points
Pr.178 to Pr.189 (Input terminal function
Pr.684 Tuning data unit
Pr.800 Control method

5.13.2 Offline auto tuning for an induction motor

Magnetic flux Magnetic flux Magnetic flux Sensorless
Sensorless Sensorless Vector
The offline auto tuning enables the optimal operation of a motor.
• Under Advanced magnetic flux vector control, Real sensorless vector control, or Vector control, automatic measurement
of motor constants (offline auto tuning) enables optimal operation of motors even when motor constants vary, when a motor
of another company is used, or when the wiring distance is long.
532
5. PARAMETERS
5.13 (C) Motor constant parameters
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Pr.0 value (%) after automatic change
Constant-
Standard
torque
*1
motor
motor
SLD/ ND/ SLD/
LD HD LD
6 6
6 6
4 4
4 4
4 4
3 2
3 2
2 2
2 2
2 2
2 2
2 2
2 2
1.5 2 1.5
1.5 2 1.5
1 1
voltagepage 715
V/F)page 713
selection)page 521
switchoverpage 532
selectionpage 221
Vector Vector
search engine
*3
SF-PR
*2
ND/ Pr.81 ≠
Pr.81 = 2 Pr.81 = 4 Pr.81 = 6
HD 2, 4, 6
4 4 4
4 7.4 6
3 5.8 5
2.5 6 4.5
2.5 6.4 4.5
2 4.5 3.7
2 4.4 4.5
1.5 3.5 3.3
1.5 4.5 3
1.5 4 3.2
1.5 2.5 3.4
1 3 2
1 2 2.5
2 1 2 2
2 0.7 2 2
1 1 1
Pr.12 value (%) after automatic
change
Constant-
Standard
torque
*1
motor
*2
motor
4 4 4
6.4 4 4
3.7 4 4
3.3 4 4
4.2 4 4
3.3 4 2
3.8 4 2
3.5 2 2
3.5 2 2
3 2 2
3 2 2
2.5 2 2
2.6 2 2
2.4 2 2
0.7 2 2
1 1 1
*3
SF-PR
4
4
2.5
2.5
2.5
2
2
1.5
1.5
1.5
1
1
1
1
1
1