65
Linear
The droop coefficient is removed linearly from rated
speed to 0.
When dynamic droop time constant is set to 0, droop control is used to balance load
among mechanically connected motors, as shown in Fig. 4-7(a). When dynamic droop
time constant is set, droop control is used to decrease current fluctuation when the load
changes suddenly, as shown in Fig. 4-7(b).
Speed
t
100%
0
Torque
P1025
100%
t
P1027
(a) P1026=0
Speed
t
0
Torque
t
P1026
(b) P1026
≠0
Fig. 4-7 Droop control
Table 4-65 Speed feedforward
ID
Parameter
Min
Max
Unit
Default
Description
P1031
Speed feedforward
enable
0
1
0
0-Disable
1-Enable
P1032
Filter bandwidth of
speed feedforward
1
100
Hz
10
Speed feedforward control can increase dynamic response of output speed under fast
acceleration and fast deceleration. If moment inertia and friction coefficient of motor
haven’t been provided by motor manufacturer, or mechanical parameter identification of
auto tuning haven’t been implemented, it is not recommended to use speed feedforward
control.
Summary of Contents for MVF2000 Series
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