Dc Interface, Principle Of Operation - Siemens SINAMICS S120 Manual

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8.25 L37, DC interface incl. pre-charging input circuit for the relevant DC link capacitance
8.25.3.5

DC interface, principle of operation

Table 8- 46
Switch setting
0
Pre-charging
1
The required auxiliary power supply is provided via the auxiliary power supply system. To
ensure that this functions properly, a digital input must be interconnected during
commissioning. Like all the other required connections, this is pre-wired in the cabinet.
If any signals are required (e.g. for checkback purposes or for activating other units), two
switching contacts can be used. Two normally-open contacts (NO) are available here for use
as required. The contacts switch in "Pre-charging" (contacts 53, 54) or "Operation" position
(contacts 63, 64). The auxiliary contacts can be loaded with a maximum of 3 A.
NOTICE
The DC interface must only be activated when the door is completely closed, otherwise the
switch coupling and the door handle could be damaged.
The door must only be opened in position "0".
In the "Pre-charging" and "1 (Operation)" positions, the door cannot be opened. Attempting
to open the door by force would damage the DC interface.
Note
Considerable force must be applied to move the DC interface between positions "0" and
"Pre-charge"!
424
DC interface, principle of operation
Meaning
Switching contacts are open
DC interface is switched to
PRECHARGE.
DC link capacitors are loaded.
Pre-charging remains activated
until the ON command is
issued.
Switching contacts are closed
Result/Comments
Neither the pre-charging section nor the main
charging section are switched in.
The pre-charging section is switched to the DC
link busbar (the main section remains switched
off).
Once the unit is switched on with the ON
command, the Motor Module unlocks the DC
interface and moves it into the operating
position.
The DC interface switches to position "1".
When the DC switch is in the operating
position, the connected auxiliary contacts are
switched.
Manual, (GH5), 05/2010, A5E03263538A
Cabinet Modules