ABB ACS880 - Page 324

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
Reference + [ 24.44 ] rpm
Reference
Reference - [ 24.43 ] rpm
Reference + [ 24.43 ] rpm
Reference
Reference - [ 24.44 ] rpm
Speed error
window
Speed error
window
Forward
Reverse
0 rpm
Speed (rpm)
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 169).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
324 Parameters