ABB ACS 600 Supplement To Firmware Manual page 27

G = Speed controller gain
e = Value connected to speed
controller
Example 1: Window Control Off
in a Load Loss Condition
%
20.02 SPEED MAXIMUM
1. 2.
Internal Torque Reference
Load
torque
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.
Figure 4-2 Window Control.
ACS 600 Master/Follower Application Macro
Window Control
Actual Speed
e
G·e
Actual Speed
3.
Speed Reference
Torque Reference
Time
Speed Reference
Torque Reference
Internal Torque Reference =
Torque Reference + Speed Controller Output
Speed Controller Output
Example 2: Window Control On
in a Load Loss Condition
%
3.
60.05 WINDOW
WIDTH NEG
1. 2.
Internal Torque Reference
Load
torque
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.
Chapter 4 – Parameters
60.05 WINDOW WIDTH NEG
60.04 WINDOW WIDTH POS
Time
Actual Speed
Speed Reference
Torque Reference
Time
4-9