ctrlX SAFETY "SafeMotion"
Safety functions in special mode "Safe standstill"
Features
The safety function “Safe operating stop (SOS)“ has the following features:
● The safety function can be used in drive systems equipped with the optional
safety technology module “Mx”.
●
The safety function is intended for safety-relevant applications up to
Category 3, PL d according to EN ISO 13849-1 or SIL 2 according to
EN 62061.
●
The safety function can only be used if it has been configured during com-
missioning (P‑0‑3285.0.1).
●
The energy supply to the motor is not interrupted.
● The controlled operation at standstill is monitored using a monitoring
window for the safe operating stop (P‑0‑3285.0.2).
Monitoring the actual position
● If the monitoring window for the safe operating stop is left, an error reaction
is triggered (F7030), setting the drive to standstill.
● If the velocity threshold for safe standstill (P‑0‑3255) is fallen below
during the transition to safe state, the standstill monitoring becomes active
(P‑0‑3285.0.2) and the axis has to come to a standstill. Thus, ensure that the
velocity threshold for safe standstill (P‑0‑3255) is sufficiently small.
Fig. 23: Safety function “Safe operating stop“ with monitoring of the actual
position
Command value monitoring
●
With the safety function activated, the standard firmware monitors, in addi-
tion to the monitoring functions of the safety technology, that there are
no velocity command values greater than the standstill window (S‑0‑0124),
preset for the drive (P‑0‑0048). If larger velocity command values are speci-
fied, an error reaction is triggered (F6200), setting the drive system to
standstill.
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