Mitsubishi Electric FR-A700-A1 Instruction Manual page 66

(2) Operation/setting procedure
 The acceleration torque amount is added while the acceleration inertia compensation signal (X57) is ON. The deceleration
torque amount is subtracted while the deceleration inertia compensation signal (X58) is ON.
Torque command
Speed
X57 (acceleration)
X58 (deceleration)
X57 signal X58 signal
OFF OFF
ON OFF
OFF ON
ON ON
 Use the X59 signal to choose acceleration and deceleration time setting parameters for the inertia compensation.
Acceleration time for
X59 signal
inertia compensation
OFF Pr. 756
ON Pr. 758
Pr. 20 
Ta = (J +J )
M L
: [inertia moment of the motor + inertia moment of the empty bobbin]  4 (Pr. 713)
J
M
J : Material moment of inertia
L
Pr.20 : Reference acceleration/deceleration speed (r/min) (operation speed at minimum diameter)
t: Acceleration time or deceleration time (Pr. 756, Pr. 757, Pr. 758, Pr. 759)
Z: Gear ratio (Pr.773, Pr.774)
1
 Pr. 715 (g/cm
Material J =
L
32
D, diameter obtained by the winding diameter calculation (m); Pr. 715, material specific gravity (g/cm
Pr. 721, roll diameter (m).
Inertia compensation torque T (%) =
Inertia compensation cushion time

Inertia compensation cushion time is the time to reach the 100% torque command.
Torque command 100%
Torque command value
Inertia compensation (acceleration)
ON
Inertia
compensation
Not performed
Acceleration
Deceleration
Not performed
Deceleration time for
inertia compensation
Pr. 757
Pr. 759
Pr. 721
Present winding diameter
9.55 t
3  Pr. 714 (m) D
)
T
a
Rated motor torqueT
Details of the tension control
Inertia compensation (deceleration)
ON

2
(N m) Z
4 4
(m) - Pr. 721 (m)
 100(%)
M
Inertia compensation
cushion time Pr. 716
3
); Pr. 714, roll width (m);
63
4