Siemens sl3120-1te28-5aa3

By Abdullah Zahid
13 min read
Siemens 6SL3120-1TE28-5AA3 SINAMICS S120 Single Motor Module booksize frame for industrial panel installation

Siemens 6SL3120-1TE28-5AA3 SINAMICS S120 Single Motor Module — Specifications, Selection Guide and Procurement Review

Controls engineers specifying a compact high-current drive module for a multi-motor SINAMICS S120 system are often searching for one piece of confirmation before committing to a purchase: does this specific module actually match the DC link infrastructure and motor load requirements of their application? The Siemens 6SL3120-1TE28-5AA3 is a booksize single motor module from the SINAMICS S120 platform, delivering 85A continuous output at 3-phase AC 400V from a DC 600V input — making it one of the highest-output options in the booksize form factor family. Before ordering, the most critical fact to confirm is that your system provides a stable DC 600V source, not AC mains; this is a DC input module only.

If you have already confirmed this is the correct part for your system, check current pricing and availability for the 6SL3120-1TE28-5AA3 at LeadTime.ca — ships worldwide.

Who Should Buy the 6SL3120-1TE28-5AA3 — and Who Shouldn't

This module is the right choice for engineers designing or maintaining a modular SINAMICS S120 multi-motor system where panel space is constrained and motor load demands reach the upper boundary of the booksize range. It is specifically suited when all of the following apply:

  • Your facility provides a stable DC 600V input (510–720V range) — not AC mains supply
  • Motor continuous current draw is at or near 85A at 400V rated speed
  • Panel layout is designed around booksize compact frame mounting dimensions
  • The system runs 3-phase AC motors requiring 400V output matched to motor nameplate
  • A DC 24V auxiliary supply (within -15% to +20% tolerance) is available with a dedicated protected circuit
  • The overall architecture is modular SINAMICS S120 with shared DC link — not a standalone G120 or third-party drive platform

If your motor load requires more than 85A, consider the full-frame SINAMICS S120 modules at 100A and above. If your application does not require modular multi-motor architecture, a SINAMICS G120 standalone drive may be a simpler and lower-cost solution.

On this page:

What the 6SL3120-1TE28-5AA3 Actually Does in a Drive System

The 6SL3120-1TE28-5AA3 is not a standalone variable frequency drive. It is a single motor module — a modular power conversion component that sits within a larger SINAMICS S120 architecture. Its specific function is to take DC power from the shared DC link (nominal DC 600V, operating range 510–720V) and convert it into a controlled three-phase AC output at 400V and up to 85A continuous, delivering precise speed and torque regulation to a connected three-phase AC motor.

The booksize frame designation indicates a compact, panel-mountable form factor designed for DIN rail or panel mounting in industrial control cabinets. This is a meaningful physical constraint: booksize modules are intended to be stacked in multi-axis configurations where multiple motor modules share a common DC bus, managed by a single SINAMICS S120 control unit. Internal air cooling is integrated into the module, removing the need for external liquid cooling infrastructure, but it does require adequate cabinet ventilation to prevent thermal shutdown.

Modular booksize motor modules represent 30–40% of SINAMICS S120 deployments in multi-motor industrial applications, favored precisely for this combination of space efficiency and scalability. Booksize variants also cost 15–25% less than equivalent full-frame drives while delivering 80–100% of the output current in space-constrained applications — a meaningful cost-per-watt advantage when specifying panels with three, four, or more motor axes.

Typical SINAMICS S120 System Architecture

The 6SL3120-1TE28-5AA3 sits at the motor control layer of a SINAMICS S120 modular drive stack, receiving conditioned DC power from upstream and delivering controlled AC power downstream to the motor. Here is where it fits in the signal and power chain:

  • AC mains supply feeds into a SINAMICS S120 Active Line Module or Basic Line Module, which rectifies and conditions the DC bus to the 600V DC operating range
  • The shared DC link distributes power to one or more motor modules — including the 6SL3120-1TE28-5AA3 — via the DC bus bar or cable connections
  • A SINAMICS S120 Control Unit (CU320-2 or similar) provides supervisory control, parameterization, and fieldbus communication across all modules in the system
  • The 6SL3120-1TE28-5AA3 converts DC 600V to 3-phase AC 400V at up to 85A, feeding directly to the motor terminals via shielded output cable
  • The connected three-phase AC motor (spindle, servo, asynchronous) responds to the speed and torque commands generated by the control unit and executed through this motor module

Where This Module Gets Used: Industries and Machine Types

Machine tool and CNC environments are among the most common deployment contexts for the 6SL3120-1TE28-5AA3. Precision spindle motor control in CNC machining centers requires the kind of tight speed and torque regulation this module delivers, in a cabinet that often has strict dimensional limits. The 85A output rating supports high-torque cutting spindle applications without requiring a full-frame drive footprint.

Multi-axis conveyor and material handling systems benefit from the stacked booksize architecture when multiple parallel drives share a common DC link. Rather than installing individual standalone drives for each conveyor axis, engineers stack motor modules side by side in a single cabinet, reducing wiring complexity and installation time.

High-speed packaging machinery — filling, capping, labeling — demands rapid acceleration and precise speed synchronization across multiple motor axes. The SINAMICS S120 modular platform with 6SL3120-1TE28-5AA3 modules at the power stage delivers both the current capacity and the synchronized control required in these applications.

Industrial robotics base cabinets and printing press drive systems also appear frequently in SINAMICS S120 deployments. In robotics, the compact booksize footprint allows multiple joint motor modules to fit in a robot base controller. In printing and paper converting, multi-motor drives with synchronized speed profiles rely on exactly this type of modular architecture.

Application Typical Deployment
CNC Spindle Motor Control Single 6SL3120-1TE28-5AA3 per spindle axis in multi-axis machining center cabinet
Multi-Axis Conveyor System Stacked booksize modules on shared DC link controlling parallel belt or chain drives
High-Speed Packaging Machinery Multiple modules for filling, capping, and labeling axes with synchronized speed profiles
Industrial Robotics Compact modules integrated into robot base cabinet for individual joint motor control
Printing Press and Paper Converting Multi-motor variable-speed drives for paper feed, tension regulation, and synchronization
Retrofit in Existing SINAMICS S120 System Drop-in replacement module maintaining modular architecture and shared DC link compatibility

Purchase-Decision Specifications at a Glance

Specification Value
Input Voltage DC 600V nominal (510–720V operating range)
Output Voltage 3-phase AC 400V
Output Current (Continuous) 85A
Auxiliary Power Supply DC 24V (-15% to +20% tolerance)
Cooling Method Internal air cooling (integral; cabinet ventilation required)
Frame Size Booksize (compact, panel-mountable)
Mounting Method DIN rail or panel mount
Product Family SINAMICS S120 Single Motor Module
Input Type DC link input only — no AC mains input
Warranty (Distributor) 2 years (typical; verify with supplier)

Full technical specifications are available on the product page at LeadTime.ca.

6SL3120-1TE28-5AA3 vs. Booksize Alternatives: Which Current Rating Do You Actually Need?

Model Number Output Current Frame Primary Use Case Key Advantage Key Limitation
6SL3120-1TE28-5AA3 85A @ 400V Booksize High-power compact applications Maximum current in booksize form factor Requires DC 600V input infrastructure
6SL3120-1TE24-0AB0 60A @ 400V Booksize Space-critical, lower-power loads Smaller physical envelope, lower cost 25% less current capacity than 85A variant
6SL3120-1TE21-0AB0 45A @ 400V Booksize Entry-level booksize applications Most compact option in the booksize family Limited to 45A loads
SINAMICS S120 Full Frame 100A+ Standard (full frame) Single large motor, standalone or modular Higher current without booksize constraint Larger cabinet footprint
SINAMICS G120 Standalone 85A @ 400V Similar Standalone single-motor operation Simpler architecture if multi-motor scaling not needed No modular shared DC link advantage

If your application requires the maximum output current available in a booksize form factor within the SINAMICS S120 architecture, the 6SL3120-1TE28-5AA3 is the correct choice — check current availability and pricing at LeadTime.ca.

Expert Procurement Verdict: Strengths, Limits, and Sourcing Reality

The 6SL3120-1TE28-5AA3 earns its place in a well-specified SINAMICS S120 system. Its primary strength is delivering 85A at 400V in a booksize form factor — the highest output in the compact frame range — which makes it the go-to choice when a project demands maximum drive current without the footprint penalty of a full-frame module. The modular shared DC link architecture means this module can be stacked alongside other 6SL3120 variants in a single cabinet, enabling scalable multi-axis systems with unified parameterization and a single upstream Line Module. For machine tool OEMs, packaging integrators, and robotics system builders working within tight panel envelopes, this is a genuinely practical and well-supported drive component.

Its real limits are architectural, not performance-related. The 6SL3120-1TE28-5AA3 only operates as part of a SINAMICS S120 system with a DC 600V link — it is not a standalone drive and cannot be retrofitted into a system that feeds it directly from AC mains. If your facility does not already have SINAMICS S120 infrastructure, the commissioning and integration overhead is significant: configuration through the SINAMICS SIZER tool, motor nameplate data entry, fieldbus communication setup, and safety validation typically account for 2–3 days of controls engineering time per module, with parameterization alone representing 40–50% of total integration labor. If simplicity and standalone operation are priorities, the SINAMICS G120 is a more appropriate platform.

On procurement: new units from authorized channels typically carry lead times of 4–12 weeks from Siemens production. Refurbished and used alternatives are generally available in 1–2 weeks, at savings of 20–40% compared to new pricing — a trade-off between warranty coverage and sourcing speed that matters significantly in emergency replacement scenarios. Volume projects typically see 10–15% bulk pricing. LeadTime.ca stocks and sources SINAMICS S120 modules with global shipping capability. If this module matches your system architecture, view current stock and pricing at LeadTime.ca.

For volume pricing, lead time confirmation before committing to a build schedule, or to discuss emergency sourcing options, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

The following points cover the key requirements and configurations for physically installing the 6SL3120-1TE28-5AA3. Full wiring diagrams and terminal assignment details are documented in the Siemens SINAMICS S120 technical manuals.

  • DC 600V input must be connected to the designated DC link terminals using properly sized conductors; no AC mains connection is supported on these terminals under any circumstances
  • DC 24V auxiliary supply connects to the control circuit terminals with a dedicated, protected circuit breaker — do not share the auxiliary supply rail with other devices without verifying total current budget including a minimum 50% margin
  • Three-phase motor output connects via shielded cable to the motor terminals; cable shielding must be grounded at both ends per the Siemens EMC Installation Guideline to prevent EMC interference
  • Booksize frame mounting requires DIN rail or panel mount with 50–100mm clearance above and below the module for internal cooling airflow; blocked ventilation pathways are the primary cause of thermal shutdown faults
  • All grounding and EMC bonding must follow the SINAMICS S120 installation guidelines; control and power cables must be routed in separate cable trays with appropriate separation distances

Commissioning Overview: What to Prepare Before Startup

Commissioning the 6SL3120-1TE28-5AA3 requires preparation before the module is powered up. The following points summarize the key steps — full commissioning procedures are documented in the Siemens SINAMICS S120 commissioning manual and require the SINAMICS SIZER tool or authorized equivalent.

  • Verify DC 600V input reads within the 510–720V range under no-load conditions using a calibrated multimeter before energizing the module; confirm DC 24V auxiliary supply is live and within tolerance
  • Collect complete motor nameplate data — rated power, speed in RPM, rated voltage, and thermal class — before launching SINAMICS SIZER; incomplete motor data is the leading cause of parameterization errors that prevent the drive from starting
  • Enter motor nameplate data into SINAMICS SIZER or the commissioning tool; export the configuration file to USB or engineering workstation for download to the drive during final startup
  • Configure control signals — fieldbus communication address, analog setpoint integration, or digital I/O mapping — before running the motor; verify all control signal sources are active and within expected ranges
  • Perform a supervised test run at reduced load, confirm correct motor rotation direction, verify no thermal or DC link fault codes appear within the first 30 minutes of operation, and document all parameter settings as a backup before handing over to production

What Engineers Get Wrong When Ordering This Module

The 6SL3120-1TE28-5AA3 is a technically specific component with infrastructure dependencies that are easy to overlook when specifying or ordering under time pressure. Before placing a purchase order, confirm every item on this checklist:

  1. Confirm your facility provides stable DC 600V input (not AC mains); this is not a 3-phase mains input drive
  2. Verify motor load does not exceed 85A continuous current at 400V output
  3. Confirm available space accommodates booksize (compact) frame; do not confuse with full-frame modules
  4. Check that 400V three-phase output matches motor nameplate voltage requirement
  5. Verify DC 24V auxiliary supply is available and protected with dedicated circuit breaker (-15% to +20% tolerance)
  6. Confirm your system architecture is modular SINAMICS S120 (not standalone SINAMICS G120 or PowerFlex)
  7. Ensure facility has internal air cooling capability; external cooling systems may be required in enclosed cabinets

If any item on this list cannot be confirmed, contact the LeadTime.ca team before ordering — we can help verify compatibility and identify the correct alternative variant if needed.

Frequently Asked Questions

Can the 6SL3120-1TE28-5AA3 be used as a standalone drive without other SINAMICS S120 components?

No. The 6SL3120-1TE28-5AA3 is a motor module that requires DC 600V input from a SINAMICS S120 Line Module and supervisory control from a compatible SINAMICS S120 Control Unit. It cannot be operated standalone, connected directly to AC mains, or used independently outside the SINAMICS S120 modular architecture. If you need a standalone drive at a similar power level, the SINAMICS G120 platform is the appropriate alternative.

What happens if the DC 24V auxiliary supply falls outside the -15% to +20% tolerance?

The control electronics of the 6SL3120-1TE28-5AA3 depend on the DC 24V auxiliary supply for logic power, communication, and safety functions. If the auxiliary voltage falls below the -15% lower limit, the module may exhibit intermittent faults, communication dropout, or fail to initialize. Over-voltage beyond the +20% upper limit risks damage to control circuitry. A dedicated, protected auxiliary circuit with adequate current capacity — sized for total system demand plus a 50% margin — is required.

What are the lead times for the 6SL3120-1TE28-5AA3 and are refurbished units a reliable option?

New units from authorized channels typically carry lead times of 4–12 weeks depending on Siemens production scheduling and regional distributor stock. Refurbished units are generally available in 1–2 weeks at 20–40% savings compared to new pricing, but come without new-unit warranty coverage. For planned maintenance budgets, new units are preferable. For emergency replacements on a live production line, refurbished sourcing is a practical option — verify the supplier's testing and warranty terms before purchasing. LeadTime.ca can advise on current stock and lead time before you commit.

How many 6SL3120-1TE28-5AA3 modules can share a single DC link in a SINAMICS S120 system?

The number of motor modules that can share a single DC link is determined by the power capacity of the upstream Line Module and the total motor load across all axes — not a fixed count limit of the motor modules themselves. Each 6SL3120-1TE28-5AA3 draws up to 85A at 400V from the shared DC bus. The SINAMICS SIZER tool is the correct resource for calculating the Line Module capacity required for a specific multi-motor system configuration.

Is the 6SL3120-1TE28-5AA3 compatible with SINAMICS PROFIBUS or PROFINET communication?

Communication protocol support in the SINAMICS S120 architecture is managed by the Control Unit (CU320-2 or equivalent), not directly by the 6SL3120-1TE28-5AA3 motor module itself. The motor module interfaces with the Control Unit via the internal drive-cliq connection. PROFIBUS, PROFINET, and other fieldbus configurations are enabled at the Control Unit level. Confirm your Control Unit variant supports the required fieldbus before specifying the system.

What is the correct response to a recurring thermal shutdown fault on the 6SL3120-1TE28-5AA3?

A recurring thermal fault indicates that the internal cooling system cannot maintain acceptable module temperature under current operating conditions. The first corrective steps are to inspect and clear any blocked cabinet ventilation pathways and cooling vents, verify that motor load does not exceed the 85A continuous rating, and confirm cabinet ambient temperature is within the design operating range. If the fault recurs after ventilation improvements, consider reducing motor load by 15–20% and upgrading cabinet airflow with forced ventilation or additional louvers. Do not reset and continue without addressing the root cause — sustained overtemperature conditions shorten module service life.

Why Source the 6SL3120-1TE28-5AA3 Through LeadTime.ca

  • LeadTime.ca sources and ships SINAMICS S120 modules worldwide — no regional restrictions on orders
  • Hard-to-find and time-sensitive parts in the SINAMICS S120 family can be quoted and sourced quickly, including refurbished options for emergency replacement scenarios
  • Volume pricing is available for multi-module projects — contact directly for bulk order quotes
  • The team can confirm lead time and stock status before you commit to a build schedule, reducing procurement risk

At-a-Glance Summary

  • Model: Siemens 6SL3120-1TE28-5AA3 — SINAMICS S120 Single Motor Module
  • Input: DC 600V nominal, operating range 510–720V — DC link input only, no AC mains
  • Output: 3-phase AC 400V, 85A continuous — highest output current in the booksize frame family
  • Auxiliary supply: DC 24V (-15% to +20%) — requires dedicated protected circuit
  • Frame: Booksize — compact DIN rail or panel mount; 50–100mm ventilation clearance required above and below
  • Cooling: Internal air cooling — cabinet ventilation is mandatory; blocked airflow causes thermal shutdown
  • Architecture requirement: Modular SINAMICS S120 system with shared DC link and compatible Control Unit
  • Warranty: 2 years typical on new units (distributor-dependent)
  • Lead time: 4–12 weeks new; 1–2 weeks refurbished (20–40% cost savings)
  • Commissioning: Requires SINAMICS SIZER tool; 2–3 days typical engineering time per module
  • Primary use cases: CNC spindle control, multi-axis conveyors, packaging machinery, industrial robotics, printing presses