Grounding Switch Upstream Of Main Breaker (Option L46) - Siemens SINAMICS S120 Manual

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.
8.36.1

Grounding switch upstream of main breaker (option L46)

The grounding switch upstream of the internal main breaker shorts the supply network to
ground.
Measures required when closing the grounding switch with the voltage available
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.
X70 "Grounding switch upstream of internal main breaker"
Table 8- 59
Terminal
1
2
3
4
5
6
7
8
Max. connectable cross-section: 2.5 mm²
1)
Cabinet Modules
Manual, 03/2013, A5E03263538A
8.36 L46/L47, grounding switch upstream/downstream of main breaker
DANGER
Terminal block X70
Designation
1)
L1
N
NC
NO
COM
NC
NO
COM
NC: Normally-closed contact, NO: Normally-open contact, COM: Center contact
Technical data
Grounding switch enable
230 V AC / 0.1 A
"Interruption of higher-level switches" feedback signal
Leading contact
Max. load current: 3 A
Max. switching voltage: 250 V AC
"Switch actuated" checkback signal
Max. load current: 3 A
Max. switching voltage: 250 V AC
Options
499