Mitsubishi Electric FR-A800 Series Instruction Manual page 550

• Set desired values as the motor constant parameters. The displayed increments of the read motor constants can be
changed with Pr.684 Tuning data unit switchover. Setting Pr.684 = "1" disables parameter setting changes.
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
• As the motor constants measured in the offline auto tuning have been converted into internal data (****), refer to the following
setting example when making setting. (The value displayed has been converted into a value for internal use. Therefore, simple
addition of a value to the displayed value does not bring the desired effect.)
Setting example: to slightly increase the Pr.90 value (5%)
When "2516" is displayed for Pr.90, set 2642 (2516 × 1.05 = 2641.8) in Pr.90.
• 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
(rad/s)], to set the induced voltage constant (phi f).
• 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)
 Encoder position tuning
Encoder position tuning is required when a PM motor with an encoder is driven. The measured offset value between the motor
home magnetic pole position and the encoder home position is stored. Only encoder position tuning can be performed when
offline auto tuning is not required, such as when the parameters for motor constant are set manually, or when offline auto tuning
is already performed.
 Before performing encoder position tuning
• Check that an option for vector control for PM motor, a motor, and an encoder are properly connected.
• Check that a motor (single, stop status) is connected. (Check that the motor is not rotated by an external force during
tuning.)
• The mechanical brake is released.
• Check that the vector control (speed control) for the PM motor with an encoder is selected. (Refer to
NOTE
• Encoder position tuning is required when a PM motor is used. (It is disabled when an induction motor is used.)
• When auto tuning is performed while Pr.96 = "101", offline auto tuning and encoder position tuning can be performed at the
same time.
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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
search engine
Pr.684 = 0 (initial value)
Setting
Setting range
increments
0 to ***, 9999 1
Pr.684 = 1
Setting
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),
0.1 mV (rad/s)
9999
*1 *1
0 to 500 A, 9999 0.01 A
*2 *2
0 to 3600 A, 9999 0.1 A
0 to 2, 9999 1
page
5. PARAMETERS
5.13 (C) Motor constant parameters
1
Initial
value
2
*1
*2
*1
3
*2
*1
*2
4
9999
5
6
7
8
9
10
n
[mV
221.)
549