Chapter 4 – Parameters
ACS 600 Master/Follower Application Macro 4-9
Figure 4-2 Window Control.
The Follower drive is torque-controlled. Parameter 11.02 EXT1/
EXT2 SELECT is set to EXT2 and 60.02 TORQUE SELECTOR
to ADD.
1. Normal operating range. Window Control keeps the speed
controller input zero. The Follower is controlled by torque refer-
ence of the Master.
2. Load loss occurs. Follower actual speed starts to rise.
3. The speed increases until the absolute value of the negative
speed error exceeds WINDOW WIDTH NEG. Window Control
connects the value outside the window to the speed controller.
Negative speed controller output value is produced and added to
torque reference received from the Master. Internal torque refer-
ence is restricted to stop the speed increase.
Speed Reference
Internal Torque Reference
Load
torque
%
Time
Actual Speed
60.05 WINDOW
WIDTH NEG
1. 2.
3.
Example 2: Window Control On
in a Load Loss Condition
Window Control
60.05 WINDOW WIDTH NEG
60.04 WINDOW WIDTH POS
Speed Reference
Actual Speed
Speed Controller Output
Internal Torque Reference =
Torque Reference + Speed Controller Output
Time
The Follower drive is torque-controlled. Parameter 11.02 EXT1/
EXT2 SELECT is set to EXT2 and 60.02 TORQUE SELECTOR
to TORQUE.
1. Normal operating range. The Follower is controlled by torque
reference of the Master.
2. Load loss occurs. Follower actual speed starts to rise.
3. The speed increases until the maximum speed limit of the
ACS 600 is reached (Parameter 20.02 MAXIMUM SPEED).
Internal torque reference is restricted to stop the speed
increase.
Speed Reference
Internal Torque Reference
Load
torque
%
Time
Actual Speed
1. 2.
3.
Example 1: Window Control Off
in a Load Loss Condition
G = Speed controller gain
e = Value connected to speed
controller
e
G·e
Torque Reference
20.02 SPEED MAXIMUM
Torque Reference
Torque Reference
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