BECKHOFF AX5805 Installation - Manual (Page 81)

Product description
AX5805 79
3.6.5.14 Description of the SLS safety function
Figure 37: Description of the Safely Limited Speed function (SLS) with time monitor
SLS limits the motor’s absolute speed. The single parameter n_SLS is defined, and this limit is the maximum
positive and negative speed of the motor.
- If the speed of the motor is outside the allowable range defined by +/- n_SLS upon activation
(SLS=0), then the timer t_SLS is started and the motor must achieve a speed within the acceptable
range before the timer elapses. If the timer elapses before the motor reaches an acceptable speed,
the Error Reaction Function SS1 or STO (as defined by ErrorReaction_SLS) is activated.
- If the speed of the motor was already within the allowable range upon activation (SLS=0), then timer
t_L_SLS is started and the velocity of the motor will be monitored after the t_L_SLS timer elapses. If
the motor exceeds the limits after the t_L_SLS timer elapses, then the Error Reaction Function SS1
or STO (as defined by ErrorReaction_SLS) is activated
SLS
1
t
Speed
n_SLS
t
-n_SLS
n_pos_max
t0
t_L_SLS
t1
Torque
on Motor
On
SLS State
1
t
t
n_neg_max
t_SLS