SMTBD1/1A-400/15 - Speed amplifier Module - INFRANOR

INFRANOR SMTBD1/1A-400/15 Variable speed drive, SMTBD series

The SMTBD1/1A-400/15 is a variable speed drive module from the INFRANOR SMTBD series, engineered for precise speed and torque control of AC synchronous motors in multi-axis industrial systems. It targets OEMs and maintenance teams operating packaging lines, web handling machines, material handling equipment, and machine tools where accurate regulation, stable torque and predictable dynamics are required. The module accepts a ±10 V analog speed command, closes the current and speed loops using resolver feedback, and delivers PWM output to the motor with a 10 kHz switching frequency. Its mechanics follow a 6U double Eurocard format that mounts in 19 inch racks, enabling dense multi-axis integration. With a nominal 565 VDC DC bus derived from 400 VAC mains and a maximum of 685 VDC, plus current handling up to 15.5 Arms peak for 1 s, the SMTBD1/1A-400/15 offers reliable performance and fast regulation in demanding B2B environments.

Technical specifications

• Manufacturer part number: SMTBD1/1A-400/15
• Series: INFRANOR SMTBD
• Manufacturer: INFRANOR
• Type: Variable speed drive, speed amplifier module, rack-mount 6U double Eurocard
• DC bus voltage: 565 VDC nominal, 685 VDC maximum, corresponding to 400 VAC mains operation
• Output current capability: 5 Arms continuous without fan, 7.5 Arms continuous with fan type 2, 15.5 Arms peak for 1 s
• Switching frequency: 10 kHz PWM
• Motor type: AC synchronous motor with resolver feedback
• Command interface: ±10 V analog speed input, 12 or 16 bit resolution
• Current loop bandwidth: greater than 1 kHz
• Speed loop bandwidth: selectable 50, 75 or 100 Hz
• Acceleration and deceleration ramps: 0 to 30 s
• Speed range and maximum speed: ratio 1:2048 at 12 bit or 1:32768 at 16 bit, motor speed up to 100 to 14000 rpm
• Feedback and encoder output: resolver input for control, programmable RS422 incremental encoder output up to 8192 ppr
• Motor inductance requirement: minimum 2 mH between phases
• Protection and diagnostics: internal and external current limitation, front panel fault display
• Construction: power card with IGBT stage and DSP logic card, designed for multi-axis 19 inch racks

SMTBD series overview

The INFRANOR SMTBD series consists of speed amplifier modules intended for multi-axis architectures where compactness, serviceability and deterministic control are priorities. The double Eurocard format supports dense cabinet layouts and facilitates module exchange without rewiring of the rack backplane. Control is based on resolver feedback for robust operation in harsh industrial environments, while the front panel indication simplifies fault localization during maintenance. The series is frequently selected to modernize or sustain installed bases where analog command and high dynamic current control must coexist with legacy machine controls such as PLCs and CNC systems.

• Passive cooling configuration: continuous current up to 5 Arms without auxiliary fan, suitable for standard duty cycles and moderate ambient temperatures
• Fan type 2 configuration: continuous current up to 7.5 Arms with dedicated ventilation, recommended for higher duty or limited airflow cabinets

The SMTBD1/1A-400/15 supports both configurations, which allows users to adapt thermal performance to their application constraints while maintaining identical control behavior and the same integration footprint.

Industrial applications

This variable speed drive integrates into a wide range of motion systems that require stable speed regulation and fast torque response. Typical use cases include axes that are coordinated by a PLC or a numerical controller through ±10 V analog outputs, with resolver feedback ensuring repeatable positioning accuracy and speed tracking across variable loads.

• Packaging and converting: web handling, unwind and rewind with tension control via speed loop and current limits
• Material handling: conveyors and feeders requiring smooth low-speed operation and precise speed synchronization
• Machine tool auxiliaries: spindles and auxiliary axes where resolver feedback is preferred for robustness
• Textile and paper: rollers and driven sections with frequent setpoint changes and ramp constraints
• Test benches: controlled speed or torque profiles with tight current loop bandwidth and programmable speed limits

Integration and communication

The drive accepts a ±10 V analog speed reference that can be generated by a PLC analog output, a motion controller or a CNC control. Resolver feedback closes the current and speed loops, with bandwidths suited to accurate tracking under disturbances. The RS422 encoder output can emulate incremental feedback to an upper-level control, up to 8192 ppr, which simplifies retrofit scenarios where the machine controller expects an encoder signal for speed or position monitoring.

Mechanical integration is straightforward in 19 inch multi-axis racks thanks to the 6U double Eurocard format. The module includes a power stage based on IGBTs and a DSP logic board. Minimum motor inductance of 2 mH must be observed to ensure stable current regulation. Acceleration and deceleration ramps from 0 to 30 s, adjustable speed loop bandwidths of 50, 75 or 100 Hz, and internal or external current limits provide the necessary parameters to adapt the drive to conveyors, winders, and spindle applications without software complexity. PWM switching at 10 kHz balances acoustic comfort and dynamic response.

Availability and warranty

The INFRANOR SMTBD1/1A-400/15 is offered by Standard Exchange Industry in several service modes, including standard exchange, supply in refurbished condition or repair of your module. Each unit is tested on a dedicated bench, shipped within 24 to 72 hours to more than 120 countries, and covered by a warranty according to the selected service. Our technical team can validate compatibility with your motor, resolver and cabinet rack, assess thermal requirements between passive and fan type 2 operation, and confirm current and speed loop settings for your process. If your production line is down, we prioritize rapid identification of the exact reference and provide a functionally equivalent solution to restore operation with minimal parameter changes.