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SINAMICS G120

Inverter chassis units 0.37 kW to 132 kW (0.5 hp to 200 hp)

SINAMICS G120 chassis units

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Siemens D 11.1 · 2008

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Overview (continued)

Modularity

SINAMICS G120 is a modular converter system comprising a

variety of functional units. The two main units are

• the Control Unit (CU) and

• the Power Module (PM)

The Control Unit

controls and monitors the Power Module and

the connected motor in several different modes. It supports

communication with a local or central controller and monitoring

devices.

The Power Module

supplies the motor in the power range

0.37 kW to 132 kW (0.5 hp to 200 hp). The Power Module is con-

trolled by a microprocessor in the Control Unit. It features state-

of-the-art IGBT technology with pulse-width-modulated motor

voltage. It also features a range of protective functions offering a

high degree of protection for the Power Module and motor.

Furthermore, a large number of additional components

is avail-

able, such as:

• Basic Operator Panel (BOP) for parameterizing, diagnosing,

controlling, and copying drive parameters

• Line filter, classes A and B

• Line reactors

• Braking resistors

• Output reactors

Safety Integrated

The SINAMICS G120 inverter chassis units are available in a

number of different variants for safety-oriented applications. All

Power Modules are already designed for Safety Integrated. A

Safety Integrated Drive can be created by combining a Power

Module with the relevant Fail-safe Control Unit.

The SINAMICS G120 fail-safe frequency inverter provides four

safety functions, certified in accordance with EN 954-1 Category

3 and IEC 61508 SIL 2:

• Safe Torque Off (STO) to protect against active movement of

the drive

• Safe Stop 1 (SS1) for continuous monitoring of a safe braking

ramp

• Safely Limited Speed (SLS) for protection against dangerous

movements on exceeding a speed limit

• Safe Brake Control (SBC) for driving motor brakes which are

active in the de-energized state, e.g. motor holding brakes

The functions “Safe Stop 1” and “Safely Limited Speed” can

both be implemented without a motor sensor or encoder; the im-

plementation cost is minimal. Existing plants in particular can be

updated with safety technology without the need to change the

motor or mechanical system.

The safety functions “Safely Limited Speed” and “Safe Stop 1”

are certified for asynchronous motors without encoders – these

safety functions are not permitted for pull-through loads as in the

case of lifting gear and winders.

For further information, please refer to section Safety Integrated

in chapter Innovations.

Efficient Infeed Technology

The advanced Efficient Infeed Technology is employed in

PM250 and PM260 Power Modules. This technology allows the

energy produced by motors operating in generator mode on

standard inverters to be fed back into the supply system. The

control cabinet can be designed even more compactly thanks to

the omission of extra cooling equipment and components such

as braking resistors, brake choppers and line reactors. The time

and expense involved in planning and wiring the system are sig-

nificantly reduced. At the same time, considerable savings can

be achieved in terms of energy consumption and operating

costs.

For further information, please refer to section Efficient Infeed

Technology in chapter Innovations.

Innovative cooling concept and paint finish of electronic

modules

The new cooling system and the paint finish for the electronic

modules significantly increase the service life or useful life of the

device. These features are based on the following principles:

• Disposal of all heat losses via an external heat sink

• Electronic modules not located in air duct

• Standardized convection cooling of Control Unit

• All cooling air from the fan is directed through the heat sink

STARTER commissioning tool

The STARTER commissioning tool supports the commissioning

and maintenance of SINAMICS G120 inverters. The operator

guidance combined with comprehensive, user-friendly functions

for the relevant drive solution allows you to commission the

device quickly and easily.

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