Monitoring And Protection Functions; Safety Shutdown Of The Converter; Speed Monitoring With Incremental Encoder; Uncontrolled Stop, Emergency Stop Category 0 - Siemens SINAMICS MV 9LD4110-7EX70-1AA0 Operating Instructions Manual

Operation

8.4 Monitoring and protection functions

8.4 Monitoring and protection functions
8.4.1

Safety shutdown of the converter

Tripping of the circuit-breaker in case of undervoltage
In the event of a serious fault, the converter is rapidly switched into a de-energized state by the
safety shutdown function.
The circuit-breaker must be equipped with an undervoltage trip to ensure the wire-break
protection for the circuit-breaker OFF command.
If a circuit-breaker OFF command is issued as a result of an overvoltage trip, the circuit-breaker
is switched off so that it is fail safe.
Danger due to high voltages after a safety shutdown
In spite of a safety shutdown function, the drive may still be operational or high voltages may
still be present.
Residual voltages can result in death, severe injury or significant material damage. The "Safety
shutdown" function can neither ensure that the drive stops immediately nor can it ensure that
residual voltages do not still exist at the output terminals and within the unit.
• Make sure that the drive no longer rotates and that there are no high voltages present.
8.4.2

Speed monitoring with incremental encoder

Permanent speed monitoring enables motor control without an encoder. If higher-performance
applications require permanent speed monitoring, additional incremental encoders can be
connected to options A51 - A54. Higher-performance applications include, for example, closed-
loop position control or prolonged applications involving low speeds.
8.4.3

Uncontrolled stop, EMERGENCY STOP category 0

Function
This function concerns the stop category 0 EMERGENCY STOP for an uncontrolled stop in
accordance with EN 60 204-1. The function enables the voltage to be isolated via the circuit
breaker. The motor coasts down.
The safety shutdown is based on a single circuit. Protection against wire breakage is assured due
to the use of circuit breakers with undervoltage release. The emergency stop button used is
forced.
104
WARNING
3rd Party LCI Control Upgrade
Operating Instructions, 02/2022, A5E31872818