Response To Safety-Related Tripping; Ex Motor Application - Siemens SIMATIC ET 200SP Manual

3.7.8.2

Response to safety-related tripping

The STO (Safe Torque Off) function is the safety function integrated in the fail-safe motor
starter. It ensures the safe disconnection of torque-generating energy on the motor. Safe
Torque Off prevents unintentional start-up in compliance with EN 60204-1 Section 5.4. The
drive is safely free from torque. This state is monitored in the motor starter.
Safety-related tripping is achieved for the fail-safe motor starters thanks to the special
arrangement and checking of the switching elements.
Safety-related tripping is achieved by low level ("0" signal) at the fail-safe digital input F-DI of
the BaseUnit. As an alternative, safety-related tripping can be achieved by removing the
24 V supply voltage from the power bus.
In the case of ET 200SP fail-safe motor starters, the OFF state is defined as the safe state
(Safe Torque Off). ET 200SP fail-safe motor starters are self-monitoring. A diagnostic
message can be sent to the controller in the event of tripping via F-DI.
Settings
Table 3- 4
Device parameter
Response to safety-related tripping
See also
F-PM-E tripping (Page 147)
Shutdown via a safety-related actuator via F-DQ (Page 148)
Safety Local (Page 149)
3.7.8.3

Ex motor application

Set the "Ex motor application" parameter if the fail-safe motor starter is to switch and protect
an explosion-proof motor.
Note
ATEX Ex II (2) G D zones
You can use the fail-safe motor starter for explosion-proof motors that are situated in ATEX
Ex II (2) G D zones.
An ATEX approval is not possible with the motor starter when it is used in 1-phase operation.
An ATEX approval is possible by means of further measures such as thermoclick.
Motor starter (3RK1308-0**00-0CP0)
Manual, 12/2016, A5E34821005002A/RS-AB/002
Response to safety-related tripping
Default setting
No warning
Product overview
3.7 Functions
Setting range
No warning
•
Warning
•
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