Installation; Dc Interface, Principle Of Operation - Siemens SINAMICS S120 Equipment Manual

The following voltages are normally present on the auxiliary voltage busbar system:
• 380 to 480 V 2 AC or 500 to 690 V 2 AC for fan supply
• 230 V 1 AC
• 24 V DC for electronics power supply
If you have installed an additional auxiliary voltage busbar system (option K75), hazardous
voltage levels may also be present here. This busbar is protected against accidental
contact.
8.20.2.4

Installation

The DC interface is pre-connected and installed at the factory. Only the handle is supplied
with the cabinet and must be mounted before commissioning the DC interface.
● Open the cabinet door.
● Insert the handle for the DC interface in the cut-out section provided in the cabinet door.
● From the inside of the door, screw the four screws provided into the holes.
8.20.2.5

DC interface, principle of operation

Table 8- 26
Switch setting
0
Pre-charging
1
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
8.20 L37, DC interface incl. pre-charging input circuit for the relevant DC link capacitance
DANGER
CAUTION
The screws must only be tightened by hand. If the screws are too tight, this will prevent
the handle from working properly.
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.
Options
389