4-291
Example:
Torque limit and speed limit operation:
In this example the torque limit and speed limit are used in a winding and unwind operation.
Winding operation
The line speed (N) and motor torque (T) are in the same direction of the motor. Refer to Figure 4.4.124
Torque
Limit
21-08
Output torque
(T)
Tref
Motor speed (N)
Torque Limit
21-07
21-04
21-04
Speed
Limit
Setting
M
Line direction
N
T
j
k
l
Figure 4.4.124 Winding operation
①
.
Speed limit bias (-21-04) > Motor Speed > speed limit bias (+21-
04) → torque based on Tref.
②
.
Motor speed (N) > speed limit bias +21-
04 → speed limit will output negative torque to prevent the
increase of motor speed.
③
.
Motor speed (N) <-21-
04 → speed limit will output a forward torque to prevent an increase of speed.
Unwinding operation
The line speed (N) and motor torque (T) are in opposite direction
Torque Limit
(21-08)
output torque
(T)
Tref
motor speed
(N)
Torque Limit
(21-07)
21-04
21-04
Speed Limit Setting
N
T
M
Line direction
Figure 4.4.125 Unwind operation
