See also
Opening the doors (Page 174)
3.5.6 Make-proof grounding switch
The make-proof grounding switch grounds the voltage DC link. This ensures that no hazardous
voltages are present in the DC link when the doors are opened.
To ensure that the device functions safely, the actuating lever for the make-proof grounding
switch must be withdrawn.
See also
Grounding using a make-proof grounding switch (Page 173)
3.5.7 Circuit-breaker (provided by the customer)
To ensure adequate device protection, the circuit breaker provided by the customer must fulfill
the following requirements:
● The maximum time between when the circuit-breaker trips to when a no-current state (I=0)
is reached is 80 ms.
● The circuit breaker must be equipped with an undervoltage tripping function.
● Avoid additional delay times when controlling the circuit breaker. All commands to the circuit
breaker must act directly without intervention of coupling relays.
● A feedback signal must be available for each of the circuit-breaker states CLOSED and
OPEN. The feedback signals must not be delayed. Consequently, do not use any coupling
relays.
● The circuit breaker is controlled and enabled from the closed-loop control. If this has not
been enabled, under no circumstances should you close the circuit breaker using external
mechanical or electrical means.
● To protect the converter transformer, ensure that overcurrent protection is in place.
3.5.8 Converter transformer
A three-winding transformer is required for the 12-pulse Basic Line Module. The secondary
windings of the three-winding transformer have a phase shift of 30°el, which results in a 12-
pulse supply with correspondingly lower line harmonics.
With a 24-pulse Basic Line Module, two three-winding transformers are required. The
additional shifting of the primary-side windings for the two transformers by +7.5° or –7.5° allows
a 24-pulse supply to be generated. Instead of the two three-winding transformers, a five-
winding transformer can be used (after consultation with the transformer manufacturer).
Description
3.5 Description of the components
SINAMICS GM150 6SL3810-2LN31-8AA2
Operating Instructions Rev.201910281332 EXAMPLE 37
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