ABB ACS880 - Page 284

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
Note that it is parameter 24.44 (rather than 24.43) that
defines the overspeed limit in both directions of rotation.
This is because the function monitors speed error (which
is negative in case of overspeed, positive in case of
underspeed).
WARNING!
In a speed-controlled follower, the speed error
window must not exceed 21.6 Zero speed limit for
a reliable ramp stop. Make sure both 24.43 and
24.44 are smaller than 21.6 (or speed error window
control disabled) when a ramp stop is required.
0 = Speed error window control disabled
1 = Speed error window control enabled
00.Disable
11.Enable
See Terms and abbreviations (page 132).
Other [bit]
Normal speed control
/ uint16
When speed error window control (see parameter 24.41
Speed error window control enable) is enabled, this
parameter determines whether the speed controller only
observes the proportional term instead of all three (P, I and
D) terms.
Speed window control
mode
24.42
0
All three terms (parameters 25.2, 25.3 and 25.4) are
observed by the speed controller.
Normal speed control
1
Only the proportional term (25.2) is observed by the speed
controller. The integral and derivative terms are internally
forced to zero.
P-control
0.00 rpm / real32Defines the upper boundary of the speed error window.
See parameter 24.41 Speed error window control enable.
Speed error window
high
24.43
- / -Upper boundary of speed error window. For scaling, see
parameter 46.1.
0.00 ... 3000.00 rpm
0.00 rpm / real32Defines the lower boundary of the speed error window.
See parameter 24.41 Speed error window control enable.
Speed error window
low
24.44
- / -Lower boundary of speed error window. For scaling, see
parameter 46.1.
0.00 ... 3000.00 rpm
0.00 rpm / real32Defines an additional speed error step given to the input
of the speed controller (and added to the speed error
value). This can be used in large drive systems for dynamic
speed normalizing.
WARNING!
Make sure the error step value is removed when
a stop command is given.
Speed error step24.46
- / -
Speed error step. For scaling, see parameter 46.1.
-3000.00 ... 3000.00
rpm
284 Parameters