Mitsubishi Electric FR-A800 Series Instruction Manual page 558

• According to the Pr.71 (Pr.450) setting, the range of the motor constant parameter setting values and units can be
changed. The changed settings are stored in the EEPROM as the motor constant parameters.
 Changing the motor constants (when setting motor constants in units of
Ω, mH, or A)
• Set Pr.71 as follows.
IPM motor
SPM motor
• Set desired values as the motor constant parameters.
First motor
Pr. motor Pr.
90 458
92 460
93 461
706 738
859 860
1412 1413
*1 For the FR-A820-03160(55K) or lower, and FR-A840-01800(55K) or lower.
*2 For the FR-A820-03800(75K) or higher, and FR-A840-02160(75K) or higher.
NOTE
• If "9999" is set, tuning data will be invalid. The MM-CF constant is used for the IPM motor MM-CF, and the inverter internal
constant is used for a PM motor other than MM-CF.
• 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) ×
10
• When Pr.71 (Pr.450) = "8093, 8094, 9093, or 9094", 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.
IPM motor
SPM motor
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Motor
MM-CF
Other than MM-CF
Second
Name
Motor constant (R1)
Motor constant (L1)/d-axis inductance (Ld)
Motor constant (L2)/q-axis inductance (Lq)
Induced voltage constant (phi f)
Torque current/Rated PM motor current
Motor induced voltage constant (phi f)
exponent
n
[mV (rad/s)], to set the induced voltage constant (phi f).
Motor
MM-CF
Other than MM-CF
search engine
Pr.71 setting
330
8090
9090
Setting range
increments
*1
0 to 50 Ω, 9999 0.001 Ω
*2
0 to 400 mΩ, 9999 0.01 mΩ
*1
0 to 500 mH, 9999 0.01 mH
*2
0 to 50 mH, 9999 0.001 mH
*1
0 to 500 mH, 9999 0.01 mH
*2
0 to 50 mH, 9999 0.001 mH
0 to 5000 mV (rad/s), 9999 0.1 mV (rad/s)
*1
0 to 500 A, 9999 0.01 A
*2
0 to 3600 A, 9999 0.1 A
0 to 2, 9999 1
333 (334)
8093 (8094)
9093 (9094)
5.13 (C) Motor constant parameters
Setting
Initial value
*1
*2
*1
*2
*1
9999
*2
*1
*2
Pr.71 setting
5. PARAMETERS
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