Active Line Modules With External Air Cooling; Description; Safety Information - Siemens SINAMICS S120 Equipment Manual

Line Modules Booksize

3.3 Active Line Modules with External Air Cooling

3.3 Active Line Modules with External Air Cooling
3.3
3.3.1

Description

The Motor Modules are connected to the power supply network via the Active Line Modules
with external air cooling, which provide the Motor Modules with a constant DC link voltage.
This ensures that they are not influenced by network fluctuations.
When the motors are in feedback mode, Active Line Modules supply power back to the
network. The regenerative feedback capability of the modules can be deactivated by
parameterization.
The DC link starts precharging as soon as the supply voltage is applied and is independent
of its phase sequence direction. Load can be applied to the DC link after the modules have
been enabled. An optional main contactor is required for disconnecting the voltage.
The Active Line Modules are suitable for direct operation on TN, IT, and TT systems. The
Line Modules have an integrated overvoltage protection function.
External air cooling uses the "through-hole" method. This is a cooling method for SINAMICS
power units that is only available for booksize devices. The power unit and its heat sink can
be inserted in a rectangular knockout at the rear of the switching cabinet and mounted with a
seal. The heat sink and the fan (included in the scope of supply) project beyond the rear of
the switching cabinet and the heat is dissipated outside the switching cabinet or in a
separate air duct.
3.3.2

Safety Information

Danger
Risk of electric shock. A hazardous voltage is present for 5 minutes after the power supply
has been switched-off.
It is only permissible to open the protective cover after this time has expired.
Warning
When opening the protective cover for the DC link, you must press the release catch.
A suitable tool (e.g. screwdriver) must be used for this purpose.
The components must only be operated when the protective cover of the DC link is closed.
Damaged components must not be used, otherwise this could result in secondary damage
or accidents.
3-20
Equipment Manual for Booksize Power Units
Equipment Manual, (GH2), 03/2006 Edition, 6SL3097-2AC00-0BP3