Line-Side Grounding Switch (Option L48); Motor-Side Grounding Switch (Option L49) - Siemens SINAMICS GM150 Operating And Installation Instructions

Description
3.6 Description of options
Failure of the auxiliary supply
If the main infeed fails, the following possibilities are available:
● The input-side circuit-breaker is still closed.
● The input-side circuit-breaker has tripped.
Note
Restriction when the drive is operated via the AOP in LOCAL mode
The automatic restart function cannot be used in conjunction with the AOP30 in LOCAL mode.
When the drive is operated in LOCAL mode, the AOP30 cancels the "ON" command to the
circuit-breaker if fault OFF1, OFF2, or OFF3 occurs.
3.6.23

Line-side grounding switch (option L48)

When the make-proof grounding switch is closed, this option allows motor-driven make-proof
grounding switches that ground the line-side input voltage to be controlled automatically.
The motor-driven make-proof grounding switches are installed in an additional cabinet.
For safety reasons, the drive controller prevents the make-proof grounding switches from being
switched when voltage is still present. Activation is integrated in the protection and monitoring
sequence of the drive. The make-proof grounding switches are closed automatically when the
standard make-proof grounding switch of the DC link is closed.
3.6.24

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.
64
When the medium-voltage supply system has been restored, the DC-link voltage increases.
This increase is detected by the closed-loop and open-loop controllers.
When a threshold value is exceeded, operation is resumed.
After a fixed, definable time, the circuit-breaker receives an "ON" command.
The system then checks the DC-link voltage.
If the DC-link voltage continues to decrease, the drive is switched off.
If the DC-link voltage increases, operation is resumed when a threshold value is exceeded.
SINAMICS GM150 6SL3815-2LN41-4AA2
Operating Instructions 04/2017