BECKHOFF AX5805 Installation - Manual (Page 57)

Product description
AX5805 55
3.6.5.6 Description of the SSR safety function
Figure 29: Description of the Safe Speed Range function (SSR) with time monitor
When the SSR function is activated, the velocity of the motor is examined and one of two timers is started.
- If the motor’s velocity is outside the allowable range defined by n_UL_SSR and n_LL_SSR upon
activation, then the timer t_SSR is started and the motor must reach a velocity in the permitted range
before the timer elapses. If the t_SSR timer elapses before a permitted velocity is reached, the
function defined by ErrorReaction_SSR is activated.
- If the motor’s velocity was already within the permitted range when the SSR function is activated,
then timer t_L_SSR is started and the velocity of the motor will be monitored after the t_L_SSR timer
elapses. If the motor exceeds the limits after the t_L_SSR timer has elapsed, then the function
ErrorReaction_SSR is activated
SSR
1
t
Speed
n_UL_SSR
t
n_LL_SSR
n_pos_max
t0
t_L_SSR
t1
Torque
on Motor
On
SSR State
1
t
t
n_neg_max
t_SSR