SMTBD1/1A-400/60 - Speed amplifier Module - INFRANOR

Variable speed drive INFRANOR SMTBD1/1A-400/60 - SMT-BD1 series

The variable speed drive SMTBD1/1A-400/60 is a servo amplifier module from the INFRANOR SMT-BD1 series. It targets maintenance teams, OEMs and system integrators who require accurate speed and torque regulation on synchronous AC motors within multi-axis architectures. Operating from a common DC bus at 565 VDC nominal, this module combines a fast current loop, a selectable speed loop bandwidth and high-resolution encoder feedback to deliver consistent dynamic performance. The analog ±10 V command interface simplifies integration with PLC and CNC systems that provide standardized analog references. With 60 Arms peak current capability and 23 Arms continuous at 40°C with the specified fan, it addresses mid-power axes while preserving thermal margins in cabinet environments. A 10 kHz PWM carrier supports smooth output current, and a minimum phase inductance requirement of 2 mH ensures compatibility with typical synchronous motor windings. The module’s 6U double Eurocard format with IGBT power stage and DSP-based control enables dense, serviceable installations in 19 inch racks. Compliance with EN60204-1 and 2500 VDC isolation contributes to electrical safety practices expected on industrial machinery.

Technical specifications

• Manufacturer part number: SMTBD1/1A-400/60
• Series: SMT-BD1 servo amplifier modules
• Brand: INFRANOR
• Application: Variable speed drive for synchronous AC motors with closed-loop control
• DC bus input: 565 VDC nominal, 685 VDC maximum
• Output current, peak: 60 Arms for 1 s
• Output current, continuous: 23 Arms with type 2 fan at 40°C ambient
• PWM carrier frequency: 10 kHz
• Minimum motor phase inductance: 2 mH
• Current loop bandwidth: greater than 1 kHz
• Speed loop bandwidth: selectable 50, 75 or 100 Hz
• Maximum motor speed setting: adjustable from 100 to 14,000 rpm
• Command interface: ±10 V analog reference for speed or torque
• Feedback: RS422 quadrature encoder A/B with index, programmable up to 8192 ppr
• Monitor outputs: analog speed and current monitors
• Form factor: 6U double Eurocard, IGBT power stage with DSP logic
• System architecture: multi-axis compatibility in 19 inch rack
• Standards: EN60204-1 conformity
• Isolation: 2500 VDC
• Thermal conditions: continuous ratings stated with type 2 fan, 40°C ambient

Overview of the SMT-BD1 series

The INFRANOR SMT-BD1 series is a family of modular servo variable speed drives designed for centralized installations using a shared DC bus. The architecture prioritizes precise current regulation, stable speed control and reliable feedback processing for synchronous AC motors in continuous or indexing duties. With analog command compatibility and DSP-based control loops, these modules integrate seamlessly into brownfield and greenfield projects where deterministic control and maintainability are essential. The series is frequently selected for line upgrades that must preserve existing PLC or CNC analog signaling while improving dynamic response and diagnostics through built-in monitors. Mechanical standardization on 6U double Eurocard and 19 inch racks supports high axis density, simplified wiring and fast module swap during maintenance windows.

• Speed control mode: Closed-loop speed regulation with ±10 V reference and RS422 encoder feedback for applications that demand consistent velocity under varying loads, such as coordinated conveyors, unwinders and precision feeding.
• Torque control mode: ±10 V torque command for processes requiring stable torque delivery, including winding with tension control, laminating, test benches and compliant pick-and-place mechanisms.

The model SMTBD1/1A-400/60 sits in a current class that provides up to 60 Arms peak for transient dynamics and 23 Arms continuous at 40°C with the specified fan. When operated on a 565 VDC nominal bus derived from 400 VAC mains, it suits medium-power synchronous motors. Selection of the 50, 75 or 100 Hz speed loop bandwidth enables tuning to machine mechanics and load inertia, while the current loop bandwidth above 1 kHz contributes to fast disturbance rejection and repeatable transient behavior.

Industrial applications

This variable speed drive integrates into a wide range of motion axes where accurate speed or torque control is required. Typical use cases include continuous processes with coordinated axes, indexing mechanisms with rapid acceleration and stop accuracy, or retrofits where analog command simplicity is prioritized. The 10 kHz PWM, encoder feedback up to 8192 ppr and adjustable maximum speed allow deployment across both low-speed high-torque and high-speed moderate-torque scenarios, provided the motor inductance meets the 2 mH minimum and the current ratings are observed.

• Machine tool and CNC auxiliaries: Feed rolls, spindle support drives and positioning axes requiring stable speed loops and encoder feedback.
• Packaging and converting: Web handling, unwinding and rewinding with torque reference for consistent web tension.
• Conveying and material handling: Precision conveyors, synchronized transfers and accumulation zones needing velocity matching.
• Textile and paper: Sectional drives with speed coordination and fast response to load variations.
• Assembly and robotics subsystems: Auxiliary rotary actuators and test stands where analog interfacing simplifies command architecture.

Integration and communication

The SMTBD1/1A-400/60 accepts a ±10 V analog reference from PLC or CNC analog output modules, which expedites integration in legacy or mixed-technology cells. RS422 quadrature encoder inputs with index provide the feedback necessary for closed-loop speed regulation and allow fine-resolution adjustments up to 8192 ppr. Analog monitor outputs for speed and current assist commissioning, loop tuning and ongoing diagnostics with oscilloscopes or data acquisition systems. The selectable speed loop bandwidths and high current loop bandwidth support systematic tuning aligned with machine compliance and inertia without complex fieldbus dependencies.

Mechanically, the 6U double Eurocard design fits multi-axis 19 inch racks, enabling a shared 565 VDC nominal bus for compact installations. This topology simplifies power distribution and favors coordinated axis operation. Compliance with EN60204-1, combined with 2500 VDC isolation, supports good engineering practice for cabinet design and operator safety. For reliable operation, observe the minimum motor phase inductance of 2 mH, respect thermal conditions for continuous current ratings and route encoder and analog lines with appropriate shielding and grounding to maintain signal integrity in industrial environments.

Availability and warranty

Standard Exchange Industry supplies the INFRANOR SMTBD1/1A-400/60 as part of its exchange, refurbished supply or repair services. Each unit is tested on a dedicated bench and prepared for rapid deployment to minimize production downtime. Shipment is organized within 24 to 72 hours to more than 120 countries, and a warranty is provided according to the selected service. Our technical team assists with cross-references within the SMT-BD1 series, verification of motor and encoder compatibility and assessment of current margins relative to your load profile. If your installation relies on a common DC bus architecture or requires analog command interoperability with existing PLC or CNC equipment, this module provides a pragmatic path to restore or sustain performance with controlled risk and predictable integration effort.