SMTBD1/1P-220/12 - Speed amplifier Module - INFRANOR

INFRANOR SMTBD1/1P-220/12 variable speed drive, SMT-BD1 series

The INFRANOR SMTBD1/1P-220/12 belongs to the SMT-BD1 digital speed amplifier series, a proven platform for high-accuracy velocity control of brushless DC servo motors in industrial automation. This variable speed drive is intended for maintenance, retrofit and OEM environments where an analog speed reference and deterministic encoder feedback ensure tight speed holding and repeatable dynamics. Maintenance teams value the straightforward I/O, the fast sampling of the speed regulator and the adjustable current limits that protect the motor and mechanics. The device is particularly relevant when a PLC or motion controller provides a ±10 V command and requires a robust servo drive with encoder support, without the overhead of complex fieldbus configuration. With single-phase 220-230 V input, 10 kHz PWM and a peak current capability up to 12 A, it addresses compact axes on conveyors, feeders, unwinders and winders, as well as auxiliary axes on packaging, printing and general machinery.

Technical specifications

• Manufacturer reference: SMTBD1/1P-220/12
• Series: SMT-BD1 digital speed amplifier family
• Manufacturer: INFRANOR
• Type: Variable speed drive, servo velocity controller for brushless DC motors
• Input supply: 220 to 230 V single phase
• Output stage: PWM inverter to motor phases, Imax up to 12 A, typical continuous around 6 A without forced cooling
• Control mode: Velocity loop with P, PI or PI2 regulator, sampling time 0.5 ms, internal current limitation
• Command interface: ±10 V analog reference, 12-bit, independent input for current limit setting
• Switching frequency: 10 kHz PWM
• Ramps: Acceleration and deceleration adjustable from 0 to 32 s for smooth starts and stops
• Feedback: Differential encoder interface A, B, Z for closed-loop speed regulation
• Protection and diagnostics: I2t thermal relay output, configurable current limits, peak duration up to 1 s, status signals for integration into safety interlocks
• Minimum motor inductance: 1 mH at 230 V to ensure compliant current ripple and thermal performance
• Auxiliary supplies: ±15 V, 50 mA available for external transducers or reference circuitry
• Digital I/O: ENABLE and functional inputs including FC+/FC- for reference and mode management

SMT-BD1 series overview

The SMT-BD1 series from INFRANOR targets precise velocity regulation on servo axes where an analog command and encoder feedback are standard. It is widely deployed in installed bases across packaging, printing, textile and materials processing lines, and remains a reliable choice for service replacement on legacy machines. The platform prioritizes deterministic control, fast sampling and clear diagnostics, which simplifies troubleshooting and reduces downtime for maintenance teams. Its analog-centric architecture is compatible with PLC-driven automation, motion controllers and retrofit scenarios where preserving the existing control philosophy is essential.

• Analog velocity control architectures: The ±10 V interface enables direct coupling to PLC analog outputs or stand-alone controllers for simple, robust speed control without fieldbus dependence.
• Coordinated multi-axis lines: Master slave implementations for unwind, process and rewind sections benefit from encoder following and consistent ramp handling to maintain web tension stability.

The SMTBD1/1P-220/12 aligns with these use cases by combining 220-230 V single-phase input, encoder feedback and configurable current limiting, resulting in predictable behavior across a wide range of loads and motor inertias.

Industrial applications

This variable speed drive integrates into diverse B2B environments where repeatable speed, tight regulation and protective current management are required. It is suited to maintenance replacements and retrofits on servo-driven axes, while also supporting new builds that rely on analog command architectures.

• Conveyors and feeders: Stable velocity for accumulation, metering and transfer, with smooth ramps to protect product flow.
• Winding and unwinding: Speed coordination in master slave schemes and web tension processes on printing, film and paper lines.
• Packaging machinery: Indexing belts, sealing rollers and pullers operating with analog references from the PLC or HMI.
• Machine tool auxiliaries: Peripheral servo axes, spindles with velocity mode, or positioning systems commanded at speed level by CNC or PLC.
• Textile and materials processing: Rollers and nip drives requiring fast response and consistent surface speed.

Integration and communication

The SMTBD1/1P-220/12 is controlled primarily via analog and discrete I/O. A ±10 V reference sets target speed, while digital inputs handle ENABLE and functional commands. The differential encoder interface A, B, Z closes the velocity loop, supporting accurate speed holding and repeatable transients. No native fieldbus card is required, which shortens commissioning and aligns with installed bases that favor straightforward point-to-point wiring. Integration with a programmable logic controller is direct, and existing wiring diagrams can often be retained during retrofit.

Commissioning focuses on setting current limits, selecting the regulator structure (P, PI or PI2), tuning gains with the 0.5 ms sampling, and defining ramps from 0 to 32 s. The I2t relay and status outputs facilitate diagnostics and interlocks at the PLC level. With a minimum allowed motor inductance of 1 mH at 230 V and a PWM frequency of 10 kHz, the drive supports smooth current regulation and controlled thermal behavior. These characteristics help reduce vibration, noise and mechanical stress on driven equipment. The architecture is compatible with multi-axis lines via master slave arrangements, ensuring uniform speed references and predictable dynamic response across sections.

Availability and warranty

Standard Exchange Industry supplies the INFRANOR SMTBD1/1P-220/12 as part of a complete industrial service offering that includes exchange, reconditioned supply and repair. Each unit provided by SEI is functionally tested on dedicated benches for conformity and delivered with a warranty according to the selected service. Global shipping is organized within 24 to 72 hours to minimize downtime on critical production assets. If your application demands a precise variable speed drive with analog command and encoder feedback, our engineering team can validate compatibility with your motor, wiring and control architecture, then recommend the most suitable option from stock or propose an equivalent replacement within the SMT-BD1 family.