Siemens 6SL3330-7TE35-0AA4 S120 ALM Grid Feedback Power Unit

Module Feature

6SL3330-7TE35-0AA4 is Siemens SINAMICS S120 chassis type Active Line Module (ALM active regenerative power supply module). Unlike SLM smart line module, ALM adopts active front-end AFE topology, realizes bidirectional energy exchange between power grid and DC bus. Rated power 300kW, DC rated current 549A, internal forced air cooling, IP00 open frame structure. It can output sinusoidal grid current, low harmonic distortion, and feed motor braking regenerative energy back to power grid without braking resistor. Equipped with Drive-CLiQ high-speed communication interface, matched with CU control unit and S120 motor modules. Suitable for cranes, hoists, dynamic test benches, centrifuges and other equipment with frequent acceleration and deceleration, high energy feedback demand.

Working principle

During motor electric operation, the module converts three-phase AC power into stable DC bus voltage to supply power to the post-stage inverter motor module. When the motor is in generating braking state, the IGBT power unit converts the regenerative DC energy into sine-wave AC and feeds it back to the power grid. The internal control circuit communicates with the control unit through Drive-CLiQ, real-time monitoring grid voltage, phase sequence, module temperature and current, to suppress grid harmonic and maintain stable DC bus voltage.

Onboard components

Active rectifier IGBT power assembly, DC bus capacitor bank, current and voltage sampling board, CIM control interface board, built-in cooling fan group, Drive-CLiQ communication interface, power busbar and protection circuit.

LED indicators

Front panel LED status lights for power, run and fault alarm; fault codes and operating parameters can be checked through S120 control panel or STARTER software.

Hardware self‑diagnosis

Power-on self-check detects grid phase loss, DC bus overvoltage/undervoltage, overcurrent, overtemperature, fan failure, grid resonance risk and Drive-CLiQ communication interruption. Fault information and event logs are stored in the control unit.

Programming software

Commissioning, topology identification, parameter configuration and fault diagnosis adopt Siemens STARTER software.

Electrical & Process Parameters

Model:6SL3330-7TE35-0AA4 Brand:Siemens Device type:S120 Active Line Module Rated power:300 kW Input:3AC 380~480V, 50/60Hz DC output:600 V DC, 549 A Cooling:Internal air cooling Protection:IP00 Communication:Drive-CLiQ Energy characteristic:Bidirectional active grid feedback Function:Provide DC bus power for S120 motor modules, realize regenerative energy feedback and low harmonic grid connection

Mechanical & Structure

Mounting:Cabinet backplane installation Protection class:IP00 Housing:Open metal frame with built-in forced cooling fan

Environmental

Operating temperature:0℃ ~ +40℃ (derating above 40℃) Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing Certification:CE, UL compliant Status:Siemens original S120 regenerative power spare module

Installation

Install the ALM module on the cabinet backplane and reserve sufficient ventilation clearance. Connect three-phase grid input terminal and DC bus output terminal to the subsequent motor modules. Connect the Drive-CLiQ cable to CU control unit. Pay attention to grid impedance matching for ALM active rectifier to avoid system resonance. Download project and complete topology identification in STARTER software.

Interface

Three-phase AC input terminal, DC bus +/- output terminal, Drive-CLiQ communication port, 24V auxiliary power terminal, PE protective ground terminal.

Diagnostic

Overvoltage alarm during braking:ALM control parameter mismatch, grid instability or resonance. Overtemperature fault:Fan damage, radiator dust accumulation or insufficient cabinet air flow. Communication interruption:Drive-CLiQ cable loose, damaged or terminal contact poor. Grid harmonic alarm:Grid impedance does not match ALM filter parameters.

Product Brief

Siemens 6SL3330-7TE35-0AA4 SINAMICS S120 Active Line Module, 300kW 380-480V, active grid feedback, low harmonic, internal air cooling, used for high-power drive equipment with frequent start-stop and braking energy recovery requirements.