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

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.
No Pulse Encoder
+ 0.1 to 0.5%
(10% of nominal slip)
N
0.4% sec.*
No Pulse With Pulse
Encoder Encoder
+ 4%* + 3%
+ 3%* + 1%
1 to 5 ms 1 to 5 ms
T
(%)
T
N
With Pulse
100
Encoder
+ 0.01%
0.1% sec.*
n -n
act ref
n
N
T
(%)
T
N
100
90
10
T
N
T
ref
T
act
T
load
t (s)
0.1 - 0.4% s
T = rated motor torque
N
n = rated motor speed
N
n = actual speed
act
n = speed reference
ref
T
ref
T
act
t (s)
< 5 ms
= rated motor torque
= torque reference
= actual torque
Program features
37