Pre-Charging And Bypass Contactor (Chassis) - Siemens SINAMICS S120 Function Manual

1.5

Pre-charging and bypass contactor (chassis)

Description
Pre-charging is the procedure for charging the DC link capacitors via resistors.
Pre-charging is normally carried out from the feeding supply network, although it
can also be carried out from a pre-charged DC link. The pre-charging input circuit
limits the charging current of the DC link capacitors.
The pre-charging input circuit for the Active Infeed (chassis) comprises a pre-
charging contactor with pre-charging resistors and a bypass contactor. The Active
Line Module controls the pre-charging input circuit in the Active Interface Module
via terminals.
The pre-charging input circuit in the Active Interface Module of module types FI
and GI contains the bypass contactor. This contactor must be provided separately
for types HI and JI.
For more information, see the Equipment Manual.
Procedure during power ON/OFF
Power ON:
S The pre-charging contactor is closed and the DC link is charged via the
pre-charging resistors.
S Once pre-charging is complete, the bypass contactor is closed and the
pre-charging contactor opened. The DC link is pre-charged and ready for
operation.
If pre-charging could not be completed, fault F06000 is output.
Power OFF:
S The pulses are inhibited and the bypass contactor is then opened.
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition
Pre-charging and bypass contactor (chassis)
Supply
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