Mitsubishi MELDAS HS Series Specifications And Instruction Manual page 93

(2) Acceleration feed forward
Vibration may occur at 10 to 20 Hz during acceleration/deceleration when a short time constant
of 30 msec or less is applied, and a position loop gain (PGN1) higher than the general standard
value or SHG control is used. This is because the torque is insufficient when starting or when
starting deceleration, and can be resolved by setting the acceleration feed forward gain
(SV015:FFC). This is also effective in reducing the peak current (torque).
While measuring the current command waveform, increase FFC by 50 to 100 at a time and set
the value where vibration does not occur.
200
Current
command
100
(Stall %)
0
0
Acceleration feed forward gain means that the speed loop gain during acceleration/deceleration
is raised equivalently.
acceleration/deceleration starts sooner. The synchronization precision will improve if the FFC of
the delayed side axis is raised between axes for which high-precision synchronous control (such
as synchronous tap control and superimposition control).
No. Abbrev. Parameter name
SV015 FFC Acceleration feed
forward gain
POINT
Chapter 8 Adjustment
20 40 60
Time（msec）
No FFC setting
Thus, the
Unit
% The standard setting value is 0. To improve the
acceleration/deceleration characteristics, increase the value by
approx. A given below. During SHG control, use the standard
setting values given below.
Motor
A
Standard value
for SHG control
Overshooting occurs easily when a value above the standard value is set
during SHG control.
200
100
0
0
80
100
With FFC setting
torque (current
Explanation
MF23 RF43/73
10 10
10 10
8–26
20
40 60 80
Time（msec）
command) required
Setting range
1 to 999
SF52/53/
SF202
102/103
50 50
100 100
100
during