Dc Interface Incl. Pre-Charging For Motor Modules In The Chassis Format - Siemens SINAMICS S120 Manual

Options
8.32 L37, DC interface incl. pre-charging input circuit for the relevant DC link capacitance
NOTICE
Danger from switching under load when feedback signal wiring is missing
If parameter p0864 is not wired to the feedback signal, it is possible to operate the switch
under load. This can shorten the service life of the switch.
Note
Additional information
The digital input parameter assignment is described in the List Manual and S120
Commissioning Manual.
8.32.3

DC interface incl. pre-charging for Motor Modules in the chassis format

The main component of option L37 is a switch disconnector. This switch disconnector is
installed on the busbar between the Motor Module and the DC busbar. This option also
includes a pre-charging switch for the DC link capacitors of the relevant Motor Module so
that it can be switched in to the pre-charged DC busbar.
This switch can be actuated using an operating lever but only when the cabinet door is
closed.
As an air guide, option L37 also includes option M60 (additional shock protection).
Note
This option is not used for switching the module on and off during operation.
Frame sizes FX and GX each contain two fuses, while frame size JX contains four fuses.
Depending on the current carrying capacity, frame size HX contains either two or four fuses.
Four pre-charging resistors are also used in frame size JX for higher power ratings. For more
detailed information, see the circuit diagrams.
Note
With option K90 (Control Unit), a checkback contact is wired from terminal -X41:12 to digital
input 3 on customer terminal block -X55 to commission the DC interface via parameter
interconnection (see "Commissioning the DC interface"). A jumper to the reference potential
is also used.
488
Cabinet Modules
Manual, 03/2013, A5E03263538A