Droop Control Function; Droop Control Gain: B7-01; Droop Control Delay Time: B7-02 - YASKAWA VARISPEED-616G5 Instruction Manual

Advanced Operation

7.3.1 Droop Control Function

7.3.1 Droop Control Function
Torque
7
Droop control is a function that allows the user to set the amount of motor slip. When a single load is oper-
ated with two motors (such as in a crane conveyor), a high-resistance motor is normally used, as shown
in Figure 7.6.
If droop control is used, a high-resistance motor characteristics can be set for a general-purpose motor.
Also, it is easy to make adjustments while watching the load balance because the amount of slip can be
set arbitrarily.
The balance of the load is very different with different amounts of slip.
Motor A's torque
characteristics
T
A
T
B
Motor B's torque
characteristics
Reference
speed
Load balance when using a general-purpose motor
Fig 7.6 Droop Control Function

Droop Control Gain: b7-01

J
User User
Constant Name
Number
b7-01
Droop control gain
Set the amount of slip as the percentage of slip when the maximum output frequency is input and the
D
rated torque is generated.
Droop control is disabled if b7-01 is set to 0.0.
D

Droop Control Delay Time: b7-02

J
User User
Name
Constant
Number
Droop control delay
b7-02
time
Constant b7-02 is used to adjust the responsiveness of droop control.
D
Increase this setting if oscillation or hunting occur.
D
Torque
Load torque
T -T >>0
A B
Speed
Load balance when using a high-resistance motor
Change g
Setting Setting
during during
Range
Opera-
tion
0.0 to 100.0
f
Change g
during during Setting Setting
Opera- Range
tion
0.03 to 2.00
f
7 - 18
Motor A's torque characteristics
Motor B's torque characteristics
T
A
T
B
Reference
speed
Valid Access Levels
Unit Factory Factory
V/f V/f with
Setting
Control PG
% 0.0
× ×
Valid Access Levels
Unit Factory Factory
V/f V/f with
Setting
Control PG
s 0.05
× ×
Load torque
T -T
A B 0
Speed
Open
Flux
Loop
Vector
Vector
A
×
Open
Flux
Loop
Vector
Vector
A
×