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Functions
6.8 Safety-related functions
Motor starter (3RK1308‑0**00‑0CP0)
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Equipment Manual, 11/2019, A5E34821005002A/RS-AC/003
6.8 Safety-related functions
6.8.1 Self-test
ET 200SP fail-safe motor starters run a self-test of the switching elements every time they
are switched on and off.
Ensure a stable line power supply. An unstable power supply may lead to a situation in
which the motor starter incorrectly signals a fault.
6.8.2 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.
Safety 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 performed by a low level ("0" signal) at the F-DI. 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
(Safety torque off). ET 200SP Failsafe motor starters are self-monitoring. A diagnostic
message can be sent to the controller in the event of tripping via F-DI.
The signal (F-DI) is provided via the corresponding BaseUnit with F-DI-infeed or F-DI
forwarding.
Settings
Table 6- 5 Response to safety-related tripping
Device parameters Default setting Setting range
Response to safety-related tripping No warning
•
No warning
• Warning