SS1 of the extended functions
Table 3-5 An overview of the principle of operation of SS1, selected when the motor is rotating
Safe Stop 1 (SS1) Standard inverter functions linked
with SS1
1. The inverter identifies when SS1 is selected via a fail-safe
input or via PROFIsafe.
---
2. The inverter monitors as to whether the motor speed decrea‐
ses.
The inverter signals "SS1 is active".
The inverter brakes the motor along
the OFF3 ramp.
3. If the motor speed is low enough, the inverter safely switches
off the motor torque using STO.
The inverter signals "STO is active" via a fail-safe digital out‐
put or via PROFIsafe.
---
6SHHG
6HOHFW66
66LVDFWLYH
672LVDFWLYH
STO
SS1
W
W
W
W
Figure 3-4 Principle of operation of SS1 of the extended functions
The SS1 safety function is standardized
The SS1 function is defined in IEC/EN 61800-5-2:
"[…] [1] Initiate and monitor the magnitude of the motor deceleration within the defined limits
and initiate the STO function if the motor speed falls below a defined limit value.
or
[2] Initiate motor deceleration and activate the STO function after an application-specific time
delay."
⇒ Inverter function SS1 of the extended functions is in conformance with the definition [1] of
IEC/EN 61800-5-2.
⇒ Inverter function SS1 of the basic functions is in conformance with the definition [2] of IEC/
EN 61800-5-2.
6HOHFW
66
66LV
DFWLYH
672LV
DFWLYH
6723
Description
3.7 An overview of the principle of operation of the safety functions
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD 37
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