Speed Control Performance Figures; Torque Control Performance Figures - ABB ACS800 Firmware Manual

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Speed control performance figures

The table below shows typical performance figures for speed control when Direct
torque control is used.
Speed control
Static speed error,
% of n
Dynamic speed
error
*Dynamic speed error depends on speed controller tuning.

Torque control performance figures

The drive can perform precise torque control without any speed feedback from the
motor shaft. The table below shows typical performance figures for torque control
when Direct torque control is used.
Torque control
Linearity error
Repeatability
error
Torque rise time
*When operated around zero frequency, the error may be
greater.
Program features
No pulse
encoder
+ 0.1 to 0.5%
(10% of nominal
N
slip)
0.4%s*
No pulse
encoder
+ 4%*
+ 3%*
1 to 5 ms
T
With pulse
100
encoder
+ 0.01%
0.1%s*
n -n
act
n
T
N
n
N
n
act
n
ref
T
(%)
T
N
With pulse
100
encoder
90
+ 3%
+ 1%
1 to 5 ms
10
T
N
T
ref
T
act
T
(%)
N
T
load
0.1 - 0.4%s
ref
N
= rated motor torque
= rated motor speed
= actual speed
= speed reference
T
ref
T
act
< 5 ms
= rated motor torque
= torque reference
= actual torque
t (s)
t(s)