ctrlX SAFETY "SafeMotion"
Fig. 40: Monitoring function 2a: "SS2, standstill-prioritized with NC-controlled
transition (with trend monitoring) (with NC-Ready)"
P‑0‑3255 SMO: Velocity threshold for Safe standstill
P‑0‑3280.0.2 SMO: Max. Transition time normal oper. to safe standstill
P‑0‑3280.0.3 SMO: Max. Transition time between safe operating states
Monitoring function 2b: "SS2, standstill-prioritized with NC-controlled transi-
tion (based on actual velocity)"
When the monitoring function 2b [SS2, standstill-prioritized with NC-controlled
transition (based on actual velocity)] has been configured, the axis is deceler-
ated in an NC-controlled way when SS2 is selected; i.e. the higher-level control
unit decelerates the drive via the command value system.
To monitor the standstill process, the transition function "Safe stop 2 (SS2)"
calls the ⮫ Transition function "Safely-monitored deceleration based on
actual velocity". If the SMD detects an exceeded velocity, the error "F7051
Safely-monitored deceleration " is reported and the drive is set to standstill
according to the parameterized error reaction (P‑0‑3263.0.1) (see ⮫ Error reac-
tion and escalation strategy).
The currently active velocity monitoring limit of Safe Motion is displayed in
“P‑0‑3238, SMO: Active velocity threshold. With this parameter it is possible to
check in the control unit whether the velocity command values are within the
allowed limits.
With the auxiliary function "⮫ limitation of the positioning velocity", it is pos-
sible to monitor and, if necessary, limit the velocity command value effective in
the drive to the active velocity threshold (P‑0‑3238).
In parallel with velocity monitoring, the SMD also monitors that
the deceleration process is completed within the parameterized tran-
sition time (P-0-3280.0.2 or P-0-3280.0.3). If the transition is not
completed within the parameterized transition time, the error "F7050
Maximum transition time exceeded" is signaled. The drive keeps being deceler-
ated in accordance with the parameterized error reaction (P-0-3263.0.1) (see
⮫ Error reaction and escalation strategy).
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