Siemens SINAMICS S120 AC frequency converter

SINAMICS S120 AC frequency converter

System Overview

1. Application Fields

SINAMICS, as a Siemens driver product series, covers various industrial applications. The S120 AC frequency converter is specifically suitable for:

Single machine drive scenarios, such as centrifuges, presses, extruders, elevators, conveyors, and transportation systems, have high requirements for accuracy, stability, and smooth operation.

Specific driving demand scenarios include drives without feedback to the grid (wire drawing, extrusion), drive groups with high availability requirements (incoming line failures do not cause all shafts to fail), as well as central drives (presses, printing, packaging) and modular machine single axis drives.

2. Platform concept and integration

Platform concept: All SINAMICS products are based on a unified platform, sharing hardware and software components, using standardized design, configuration, and debugging tools, and can be flexibly combined without system gaps to meet diverse driving tasks.

Fully Integrated Automation (TIA): S120 is one of the core components of TIA, working in collaboration with SIMATIC, SIMOTION, and SINUMERIK. The STARTER debugging tool is an integral part of the TIA platform, supporting parameter setting, programming, and debugging of fully automated systems, and achieving efficient system communication through PROFIBUS DP, PROFINET, and other technologies.

3. System components and data

Core components:

Power components on the grid side, such as fuses, contactors, reactors, and line filters, are used for grid connection and EMC compliance.

Power module (PM): a type that includes or does not include integrated circuit filters and integrated brake choppers, providing power to motors. It comes in series such as PM240-2 and PM340, and is available in formats such as Blocksize and Chassis.

Control Unit (CU) and Adapter: Provides driver and technical functions, such as CU310-2 PN (PROFINET interface), CU310-2 DP (PROFIBUS interface), and adapters such as CUA31 and CUA32 have expandable functions.

Auxiliary system components: such as sensor modules (SMC10/20/30), safety brake relays, safety brake adapters, etc., used for expanding functions and processing encoders, process signal interfaces.

Motor side components: including motor reactors, sine filters, dv/dt filters, etc., to reduce voltage stress on motor windings and lower capacitor charging and discharging currents.

Attachments: such as DRIVE CLiQ cabinet liners, couplers, installation frames, shielding connection kits, etc.

Key system data:

Voltage: Blocksize format supports 1-phase 200-240VAC ± 10%, 3-phase 200-240VAC ± 10%, and 3-phase 380-480VAC ± 10%; Chassis format supports 3-phase 380-480VAC ± 10%; The electronic power supply is 24VDC -15/+20% (PELV or SELV).

Frequency: Rated pulse frequency Blocksize format 4kHz, Chassis format 2kHz, higher than this frequency, current derating should be considered; The line frequency is 47-63Hz.

Protection and Environment: Protection level IPXXB (UL 508 open type), Line power supply circuit protection level I (with protective grounding), Working environment temperature 0-40 ℃ (no derating below 1000m), Humidity 5% -90%, No oil mist, salt mist, icing, condensation water, etc.

Core Component Details

1. Power Modules

Classification and Structure:

PM240-2 (Blocksize): Power range 0.55-15kW, including line side diode rectifier, DC link electrolytic capacitor (with pre charging circuit), output inverter, brake chopper, etc. It has built-in and through cooling methods, with and without line filter versions, suitable for different frame sizes (FSA/FSB/FSC), needs to be installed vertically, and maintains a specific ventilation gap (such as 80mm above FSA and 100mm below FSA).

PM340 (Blocksize): Power range 0.12-90kW, similar in structure to PM240-2, with more frame sizes (FSA-FSF), vertically installed, with different ventilation gaps for different frame sizes (such as FSA/FSB up and down 100mm, FSC up and down 125mm, etc.), some can be installed as basic components in combination with line reactors.

Chassis format power module: current range 210-490A, internal air cooling, short circuit/ground fault protection, with electronic nameplate and LED status display, communicating with the control unit through DRIVE CLiQ, paying attention to fan voltage regulation (setting transformer taps according to grid voltage), and removing interference suppression capacitor connection brackets in non grounded grids (IT systems).

Technical parameters: Different models of power modules have different rated currents, power losses, cooling air requirements, and adapted motor powers. For example, the PM240-2 FSA (200V) has a rated current of 3.9A and a power loss of 0.04kW; the Chassis format 1TE32-1AA3 model has a rated current of 210A and a power loss of 2.46kW, and attention should be paid to overload capacity (such as short-term overload current, overload duration) and derating characteristics (affected by environmental temperature, pulse frequency, and installation height).

2. Control unit and adapter

Control unit (CU310-2 series):

CU310-2 PN: PROFINET interface, including 11 isolated digital inputs, 8 non isolated digital inputs/outputs, 1 isolated digital output and other interfaces, supports HTL/TTL/SSI encoder evaluation, analog setpoint input, hot swappable, firmware version 4.4 and above available, LED display status (RDY, COM, etc.), switches analog input types through DIP switch S5, has a RESET button to restart the device and backup data.