Mitsubishi Electric FR-D720-0.2K-G Instruction Manual page 109

Selection and protection of a motor
Parameter
Name
Number
Induced voltage constant
706
(phi f)
707 Motor inertia (integer)
711 Motor Ld decay ratio
712 Motor Lq decay ratio
Starting resistance tuning
717
compensation
Starting magnetic pole
721 position detection pulse
width
724 Motor inertia (exponent)
Motor protection current
725
level
Motor induced voltage
726
constant (phi f) exponent
859 Rated PM motor current

The value left of the slash is for the 2.2K drive unit or lower. The one right of the slash is for the 3.7K drive unit.

The capacity of the S-PM geared motor is initially set to the next smaller size than the capacity of the drive unit.

The value left of the slash is for the 200V class drive unit. The one right of the slash is for the 400V class drive unit.
....... Specifications differ according to the date assembled. Refer to page 294 to check the SERIAL number.
POINT
 When the S-PM geared motor is used, offline auto tuning is not required.
 Tuning is enabled even when a load is connected to the motor.
 Reading/writing of the motor constants tuned by offline auto tuning is enabled. The offline auto tuning data
(motor constants) can be copied to another drive unit using a parameter unit.
 The offline auto tuning status can be monitored on an operation panel or a parameter unit.
 Before performing offline auto tuning
Check the following points before performing offline auto tuning:
 A motor is connected. (Check that the motor is not rotated by an external force during tuning.)
 The motor capacity is equal to or one rank lower than the drive unit capacity.
Using a motor with the rated current substantially lower than the drive unit rated current will cause torque ripples, etc. and
degrade the speed and torque accuracies. As a reference, select the motor with the rated motor current that is 40% or
higher of the drive unit rated current.
 The wiring length between the drive unit and the motor should be 30m at maximum.
 The motor may run slightly during offline auto tuning. (Tuning performance is unaffected.)
Therefore, fix the motor securely with a mechanical brake, or before tuning, make sure that there will be no problem in
safety if the motor runs. (Caution is required especially in vertical lift applications.)
 Tuning may not be available for motors with an extremely low rated speed or motors for which magnetic saturation is
difficult to occur.
106
Initial Value Setting Range
0 to 5000mV (s/rad)
9999
9999
10 to 999
9999
9999
9999 0 to 100%, 9999
9999 0 to 100%, 9999
9999 0 to 200%, 9999
9999 0 to 6000μs, 9999
4 to 7
9999
9999
0 to 500%
9999
9999
0 to 2
9999
9999
0 to 500A
9999
9999
Description
Set the value according to the PM motor
specifications.
The value calculated from the settings of the
motor constant parameters is used.
Set the motor inertia.
Internal data of the drive unit is used.
Tuning data
(The value measured by offline auto tuning
is automatically set.)
9999: Internal data of the drive unit is used.
Set the motor inertia.
Internal data of the drive unit is used.
Set the maximum current (OCT) level of the
motor.
200%
Set the exponent n when the induced
voltage constant phi f (Pr. 706) is multiplied
by 10^n.
n = "0" when Pr. 706 = "9999".
Tuning data
(The value measured by offline auto tuning
is automatically set.)
Internal data of the drive unit is used.