L46/L47, Grounding Switch Upstream/Downstream Of Main Breaker; Grounding Switch Upstream Of Main Breaker (Option L46) - Siemens SINAMICS S120 Manual

8.29

L46/L47, grounding switch upstream/downstream of main breaker

Availability of option
This option is available for the following S120 Cabinet Modules:
● Line Connection Modules (frame sizes KL and LL)
Description
The grounding switch short-circuits the incoming supply line to ground for servicing. It is
engaged manually by means of a rotary actuator and ensures, for example, safe isolation
from supply in the Cabinet Module during servicing.
Two versions are available and can be supplied at the same time. Version 1 establishes a
ground connection for the connected power lines, and Version 2 grounds the cabinet's
internal components located downstream of the circuit breaker.
8.29.1

Grounding switch upstream of main breaker (option L46)

The grounding switch upstream of the internal main breaker shorts the supply network to
ground.
Plant-side measures must be taken to prevent the grounding switch from engaging when
the voltage is applied. For this purpose, the checkback signal "Interruption of higher-level
switches" must be connected to the higher-level switching equipment and must trigger
immediate opening of the upstream main breaker, if necessary.
When the grounding switch is engaged, it must not be possible to switch in the power
supply.
Note
The signals required for interlocking are available on the terminal block.
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A
8.29 L46/L47, grounding switch upstream/downstream of main breaker
DANGER
Options
429