Mitsubishi Electric 800 Series Instruction Manual page 314

Compact, high functionality inverters
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 Changing the motor constants (when setting motor constants in units of
Ω, mH, or A)
• Set Pr.71 as follows.
Motor
Pr.71 setting
IPM motor
8090
SPM motor
9090
• Set desired values as the motor constant parameters.
First
Second
motor Pr.
motor Pr.
90
458
Motor constant (R1)
92
460
Motor constant (L1)/d-axis inductance (Ld)
93
461
Motor constant (L2)/q-axis inductance (Lq)
706
738
Induced voltage constant (phi f)
859
860
Torque current/Rated PM motor current
1412
1413
Motor induced voltage constant (phi f) exponent
NOTE
• If "9999" is set in the motor constant parameters, tuning data will be invalid and the inverter internal constant is used.
• To change a motor induced voltage constant of PM motors, the setting in Pr.706 Induced voltage constant (phi f) or Pr.738
Second motor induced voltage constant (phi f) must be changed. If the constant after the change exceeds the setting range
of Pr.706 or Pr.738 (0 to 5000 mV (rad/s)), set Pr.1412 Motor induced voltage constant (phi f) exponent or Pr.1413
Second motor induced voltage constant (phi f) exponent. Set a value in the exponent n in the formula, Pr.706 (Pr.738) ×
n
10
[mV (rad/s)], to set the induced voltage constant (phi f).
• When Pr.71 (Pr.450) = "8093 or 9093", or Pr.1412 (Pr.1413) = "9999", the motor induced voltage constant is as set in Pr.706
(Pr.738). (No exponent setting)
 Changing the motor constants (when setting a motor constants in the
internal data of the inverter)
• Set Pr.71 as follows.
Motor
Pr.71 setting
IPM motor
8093
SPM motor
9093
• Set desired values as the motor constant parameters.
First motor
Second
Pr.
motor Pr.
90
458
Motor constant (R1)
92
460
Motor constant (L1)/d-axis inductance (Ld)
93
461
Motor constant (L2)/q-axis inductance (Lq)
706
738
Induced voltage constant (phi f)
859
860
Torque current/Rated PM motor current
1412
1413
Motor induced voltage constant (phi f) exponent
Name
0 to 50 Ω, 9999
0 to 500 mH, 9999
0 to 500 mH, 9999
0 to 5000 mV (rad/s), 9999 0.1 mV (rad/s)
0 to 500 A, 9999
0 to 2, 9999
Name
13.3 Offline auto tuning for a PM motor (motor constant tuning)
Setting
Setting range
increments
0.001 Ω
0.01 mH
0.01 mH
0.01 A
1
Setting
Setting range
increments
0 to ***, 9999
1
13. (C) Motor Constant Parameters
11
12
13
Initial value
14
9999
15
16
17
18
19
20
Initial
value
9999
313

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