Siemens SINAMICS G120 High-Performance Converter Power Module 6SL3210-1PE21-8AL0 for Variable Speed Drives

6SL3210-1PE21-8AL0 Product Overview

The 6SL3210-1PE21-8AL0 is a high-performance frequency converter power module from Siemens' SINAMICS G120 series, belonging to the PM240-2 series. This module has a rated power of 1.1 kW (Light Duty) / 0.75 kW (Heavy Duty), is suitable for 3AC 380-480V industrial power networks, and delivers an output current of 3.4 A (Light Duty) / 2.6 A (Heavy Duty). It utilizes advanced IGBT technology and sensorless vector control algorithms, enabling excellent motor speed and torque control in both open-loop and closed-loop applications.

The core features of this power module are its high energy efficiency and modular design. It integrates a braking transistor, an internal Class A (Category C2) EMC filter, and a coated PCB, making it suitable for complex industrial environments. The module features a booksize form factor with a width of only 50 mm and supports side-by-side, zero-gap mounting, greatly saving control cabinet space. As part of the G120 drive system, it can be combined with control units such as the CU230P-2 and CU240E-2, supporting bus communications like PROFINET, PROFIBUS, and EtherNet/IP.

The SINAMICS G120 series is Siemens' mainstream general-purpose variable frequency drive platform, targeting standard industrial applications such as pumps, fans, compressors, conveyors, and mixers. With its compact design, robust reliability, and comprehensive protection functions, the 6SL3210-1PE21-8AL0 is a cost-effective choice for OEM equipment manufacturing and production line upgrades.

6SL3210-1PE21-8AL0 Key Features

• Rated Power and Current: Power of 0.75 kW (Heavy Duty) / 1.1 kW (Light Duty), input of 3AC 380-480V. Heavy Duty output current of 2.6 A (110% overload for 60 s), Light Duty output current of 3.4 A. Suitable for standard 0.75 kW three-phase asynchronous motors.

• Control Modes: Supports V/f control (linear/square/parameterizable), Sensorless Vector Control (SLVC), and Vector Control (VC) with encoder. Meets the requirements of various applications, from fans and pumps to basic tension control.

• Integrated Safety Function: Standardly equipped with STO (Safe Torque Off) compliant with SIL 3 / PL e, allowing safe disconnection of motor torque without external contactors, meeting machinery safety standards.

• Integrated Braking Unit: Features an integrated braking chopper for connecting an external braking resistor, enabling rapid braking or energy dissipation for high-inertia or overhauling loads.

• EMC Characteristics: Integrated Class A (Category C2) EMC filter, compliant with EN 61800-3 standard, reducing electromagnetic interference to other on-site equipment and lowering external filtering costs.

• Environmental Robustness: PCB with enhanced coating (conformal coating), resistant to humidity, dust, and chemical gases. Operating temperature of -10°C to +50°C without derating, up to +60°C with derating.

• Compact Design: Booksize form factor: 50 mm (W) × 291 mm (H) × 165 mm (D). Supports side-by-side zero-gap mounting, significantly reducing control cabinet dimensions.

• Communication and Expansion: Can be connected to Industrial Ethernet via a standard dual-port EtherNet/PROFINET control unit. Supports features like macro switching, holding brake control, and PID controller, suitable for pumps, fans, compressors, and material handling applications.

  
  

6SL3210-1PE21-8AL0 Applications

• Fans, Pumps, Compressors: Features like PID control, energy-saving modes, and automatic restart make it suitable for variable torque loads such as HVAC, water treatment, and air compressors.

• Material Handling & Conveyors: Supports multiple speeds, S-curve ramp times, and holding brake control, ideal for parcel sorting, warehouse logistics, and production line conveyors.

• Small Machinery: Sensorless vector control improves dynamic response, suitable for constant torque loads like mixers, centrifuges, and extruders.

• OEM Equipment Manufacturing: The compact size and modular design facilitate integration into packaging machinery, textile machinery, woodworking machinery, and food processing machinery.

  
  

6SL3210-1PE21-8AL0 Advantages & Highlights

• High Efficiency & Energy Savings: Uses efficient IGBTs and optimized modulation algorithms, achieving efficiency >95% under partial load, significantly reducing energy consumption of the motor drive system.

• High Flexibility via Modularity: The power module and control unit are completely separate, allowing independent replacement or upgrading of the control interface (e.g., from PROFIBUS to PROFINET), reducing spare parts and maintenance costs.

• Fast Commissioning: Supports quick commissioning via the BOP-2 panel or Siemens Starter / TIA Portal software. Macros and wizards reduce parameterization time.

• High Reliability: Conformal-coated PCB, integrated STO, output short-circuit and ground fault protection, plus undervoltage, overvoltage, and overtemperature protection, significantly reduce on-site failure rates.

• Easy Installation & Maintenance: Book-size side-by-side mounting, front-side wiring, and pluggable terminals reduce control cabinet assembly and subsequent maintenance difficulty.

• Global Application Certifications: Holds certifications such as CE, UL, cUL, C-Tick, EAC, etc., allowing direct use in export equipment.

  
  

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FAQ:

1. What is the Siemens 6SL3210-1PE21-8AL0 and what is it used for?
   This is a SINAMICS G120 PM240‑2 power module – the power stage of a modular variable‑speed drive. It must be combined with a separate Control Unit (CU) to form a complete VSD. Rated 1.5 kW (HO) / 2.2 kW (LO) for 3‑phase 380‑480 V input, it controls standard induction motors and synchronous reluctance motors in general industrial applications such as pumps, fans, conveyors, and machine tools.

2. What does "1.5kW (HO) / 2.2kW (LO)" mean on this power module?
   PM240‑2 modules are rated with two load profiles: **HO (High Overload)** delivers up to 200% overcurrent for 3 seconds, suitable for constant‑torque applications like conveyors, mixers, or hoists. **LO (Low Overload)** allows up to 110% overcurrent for longer durations, typical of variable‑torque loads such as centrifugal pumps and fans. The module can operate at the higher LO power only when the HO duty is not required.

3. Which Control Units (CUs) are compatible with this PM240‑2 power module?
   All current SINAMICS G120 Control Units work with the PM240‑2: the standard CU240B‑2, CU240E‑2, the advanced CU250S‑2 (with integrated safety), and the compact CU230P‑2 (optimized for pumps/fans). Simply snap the CU onto the power module and connect the flat‑ribbon cable – no additional wiring is needed for the basic interface.

4. What power supply does the 6SL3210-1PE21-8AL0 require, and can it run from a single‑phase supply?
   The module requires a 3‑phase 380‑480 V ±10% (50/60 Hz) supply. It cannot run from a single‑phase source. For single‑phase applications, consider a G120C or a different power module variant rated for single‑phase input. The module’s 24 V control electronics supply is typically derived internally or provided through the CU connection.

5. What is the enclosure rating, and where can I install this power module?
   The module has an IP20 protection class, meaning it is designed for cabinet installation only. Mount it on a DIN rail or a backplate inside a clean, dry electrical cabinet. Adequate ventilation must be maintained according to the spacing guidelines in the manual, and the ambient temperature must not exceed the derating limits (typically 0‑40 °C without derating for standard operation).

6. Does this module include a braking chopper? How do I connect a brake resistor?
   Yes, the PM240‑2 frame size A modules (including this one) have a built‑in braking chopper. You can connect an external braking resistor directly to the DC+/R+ and R‑ terminals on the module. The braking resistor absorbs regenerated energy when the drive decelerates, preventing the DC‑link voltage from exceeding the limit. The resistor must be sized according to the load inertia and duty cycle.

7. What are the main advantages of the PM240‑2 compared to the G120C integrated drive or the PM240?
   The PM240‑2 is the latest generation of the classic PM240, with a wider voltage range, improved cooling, and a 24 V supply connection. Compared to the G120C (which bundles the CU and PM in one housing), the PM240‑2 offers modularity: you can replace the CU if your functionality requirements change, and the physical separation of power and control simplifies maintenance and upgrades.

8. How do I commission and parameterize the drive after mounting the module?
   Attach the compatible CU, power the module, and connect to the CU via USB or PROFINET/PROFIBUS. Use the Siemens STARTER software (free) or the TIA Portal “Drive Commissioning” wizard to set motor data, ramp times, and application‑specific parameters. The module itself has no display or buttons; all configuration is done through the CU and its associated tools.

9. Can I use this module to replace an older PM240 or MM4 drive? What should I watch out for?
   Yes, the PM240‑2 is the drop‑in successor to the original PM240. The physical footprint and terminal layout are nearly identical for frame size A. When migrating from an MM4 (MicroMaster 4), note that the G120 CU uses a different parameter structure; a conversion tool is available in TIA Portal. Also, verify that the existing motor cable length and EMC filter still comply with the PM240‑2 specifications.

10. What are the most typical applications for the 6SL3210-1PE21-8AL0 power module?
    It powers small industrial motors in material‑handling conveyors, packaging machines, small pumps and fans, textile machinery, and auxiliary drives in process plants. Its modularity, combined with the safety and communication options of the CU family, makes it a versatile building block for both stand‑alone and networked automation systems.