Siemens SINAMICS S120 Equipment Manual page 88

Line Modules
4.3 Active Line Modules
Fig. 4-13 Overview of Active Infeeds, frame size GI/GXL
In the case of an Active Infeed with an Active Line Module of frame size HXL and JXL, the
bypass contactor is not included in the associated Active Interface Module, but must be
provided separately. The Active Interface Modules and Active Line Modules of this frame
size have degree of protection IP00.
Fig. 4-14 Overview of Active Infeeds, frame size HI/HX and JI/JXL
Operating principle
One or more Motor Modules can be connected to the power supply network via the Active
Line Module. The Active Line Module provides a constant DC link voltage for the Motor
Modules. This ensures that they are not influenced by line voltage fluctuations. The
regenerative feedback capability of the Active Line Module can be deactivated by
parameterization.
The Active Line Module is suitable for direct operation both on TN and on IT and TT
systems.
With the motors operating as generators, the Active Line Module feeds regenerative energy
into the supply network.
The Active Line Module is used for:
• Machines with high dynamic drive requirements
• Frequent braking cycles and high braking energy
The fans for the internal electronic circuitry are only switched on when required.
The fans are switched on and off as a function of several factors (e.g. heat sink temperature,
ambient temperature, output current, duty cycle, ...) which means that fan operating cycles
cannot be calculated directly.
4-20
SINAMICS S120 Equipment Manual, Edition 12/2007, 6SL3097-2AM00-0BP4
Chassis Power Units Liquid Cooled