3
Safety concept
Drive safety functions
Manual – MOVISAFE
®
CS..A Safety Card
23
3.7.6
SOS – Safe Operating Stop
The SOS function prevents the motor from deviating from the stop position by more
than a specified value. The drive inverter delivers the power to keep the motor in posi-
tion. If the specified value is exceeded, the drive safety function will be triggered and
an error response will be initiated at the same time.
t
1
t
2
t
V
9007201225700491
= Drive safety function monitoring
= Drive safety function trips
v
= Speed
t
= Time
t
1
= Point in time when SOS is triggered.
t
2
= Point in time when SOS is deactivated.
3.7.7
SLA – Safely Limited Acceleration
The SLA function prevents a movement from exceeding a specified acceleration
value. If the permitted acceleration limit is exceeded, the drive safety function will be
triggered and an error response will be initiated at the same time.
t
1
t
2
t
V
9007201225705355
= Drive safety function monitoring
= Drive safety function trips
v
= Speed
t
= Time
t
1
= Point in time when SLA is activated.
t
2
= Point in time when SLA is deactivated.
24842532/EN – 04/2018
