Motor-Side Grounding Switch (Option L49); Cabinet Illumination And Service Socket In Closed-Loop Control Unit (Option L50); Disconnector At The Drive Output (Option L51); Circuit Breaker At The Drive Output (Option L52) - Siemens SINAMICS GM150 Operating Instructions & Installation Instructions

Description
3.6 Description of options
3.6.21

Motor-side grounding switch (option L49)

Under the following circumstances, operating modes can occur for which there is the danger
that the motor returns power to the drive:
● Operating mode / variant of the load machine, e.g. drive group with gas turbine
● Type of drive machine, e.g. permanently excited motor
resulting in hazardous voltages.
When the make-proof grounding switch is closed, this option allows motor-driven make-proof
grounding switches that ground the motor-side output voltage to be controlled automatically.
The motor-driven make-proof grounding switches are installed in an additional cabinet.
For safety reasons, the open-loop control system locks the make-proof grounding switch so
that they cannot be closed while voltage is still present. The control is integrated into the
protection and monitoring circuit.
Observe the notes regarding the grounding switch provided in Chapter "Safety instructions
(Page 18)" and "Maintenance (Page 173)". Carefully comply with the 5 safety rules (Page 17).
3.6.22

Cabinet illumination and service socket in closed-loop control unit (option L50)

One universal light with service socket is installed in each cabinet element for the trigger and
control section. The universal light and the power socket are supplied externally with power and
must be fused with max. 16 A.
The cabinet illumination can be switched on manually or automatically by means of an
integrated motion detector (default setting). If the light is switched on by the motion detector, it
stays on for three minutes. The mode is selected via the switch on the light.
3.6.23

Disconnector at the drive output (option L51)

With this option, a motor-operated isolator is integrated at the drive output.
If manual isolation between the drive output and drive motor is required for protection and
safety reasons, this can be achieved by means of the motor-operated isolator.
3.6.24

Circuit breaker at the drive output (option L52)

With this option, a circuit-breaker is integrated at the drive output. If isolation between the drive
output and drive motor is required for protection and safety reasons, this can be achieved by
means of the circuit-breaker. The circuit-breaker is controlled from the drive controller. When
an ON command is issued, the output-side circuit-breaker is activated along with the auxiliary
equipment. When an OFF command is issued, the circuit-breaker is deactivated.
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SINAMICS GM150 6SL3810-2LN31-8AA2
Operating Instructions Rev.201910281332 EXAMPLE