Siemens Sinamics G120 Function Manual page 40

Description
3.7 An overview of the principle of operation of the safety functions
Application examples for the SLS function
Examples
Setup mode: The machine operator must enter the
dangerous area of a machine and manually intro‐
duce material into a machine part.
A turning machine must not exceed a specific maxi‐
mum torque in order to protect the drill chuck from
damage.
Functional expansion: selecting SLS levels
Expansion of the SLS function to include several SLS levels:
● The speed monitoring of the SLS function can be extended to include a maximum of 4
different SLS levels.
● The inverter requires additional safety-related signals to select an SLS level and to signal
back which SLS level is active.
It is only possible to select SLS levels via PROFIsafe.
The switchover from a higher SLS level 2 to a lower SLS level 1 is described as example in
the following.
Table 3-7
1. The inverter signals "SLS level 2 is active" via the
2. The inverter recognizes the selection of SLS level 1
3. SLS allows a motor to reduce its possibly inadmissibly
4. The inverter monitors the absolute actual speed
40
Switching over from SLS level 2 to SLS level 1
Safely Limited Speed (SLS)
safety-related PROFIsafe communication.
via the safety-related PROFIsafe communication.
high speed within a defined time – or to reduce it along
a defined braking ramp.
against SLS level 1.
The inverter signals "SLS level 1 is active" via the
safety-related PROFIsafe communication.
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Possible solution
● Select SLS in the inverter via a fail-safe
digital input or via PROFIsafe.
● The inverter limits and monitors the speed of
the machine part.
Standard inverter functions linked with
SLS
The inverter limits the speed setpoint to
values below SLS level 2.
The inverter limits the speed setpoint to
values below SLS level 1.
If the motor rotates faster than the SLS
monitoring value, then the inverter brakes
the motor along the OFF3 ramp.
The inverter limits the speed setpoint to
values below SLS level 1.
Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD