ABB ACS800 Firmware Manual page 203

Index Name/Selection
60.03 WINDOW SEL ON
NO
YES
60.04 WINDOW WIDTH
POS
0 ... 1500 rpm
60.05 WINDOW WIDTH
NEG
0 ... 1500 rpm
Description
Activates the Window control function. The Window control, together with
selection ADD at parameter 60.02, forms a speed supervision function for a
torque-controlled drive. The parameter is visible only when Master/Follower is
active (See Par. 60.01). External control location 2 (EXT2) must be active to
enable window control.
Inactive
Window control is active. Selection YES is used only when parameter
has value ADD. Window control supervises the speed error value (Speed
Reference - Actual Speed). In the normal operating range, window control
keeps the speed controller input at zero. The speed controller is evoked only if:
- the speed error exceeds the value of parameter
- the absolute value of the negative speed error exceeds the value of
parameter 60.05.
When the speed error moves outside the window, the exceeding part of the
error value is connected to the speed controller. The speed controller produces
a reference term relative to the input and gain of the speed controller
(parameter 23.01) which the torque selector adds to the torque reference. The
result is used as the internal torque reference for the drive.
Example: In a load loss condition, the internal torque reference of the drive is
decreased to prevent an excessive rise of the motor speed. If window control
were inactivated, the motor speed would rise until a speed limit of the drive
were reached.
Defines the supervision window width above the speed reference. See
parameter 60.03. The parameter is visible only when Master/Follower is active
(See Par. 60.01).
Positive window width
Defines the supervision window width below the speed reference. See
parameter 60.03. The parameter is visible only when Master/Follower is active
(See Par. 60.01).
Negative window width
60.02
60.04 or
Actual signals and parameters
203
FbEq
0
65535
0... 20000
0... 20000