SMTBD1/1A-400/45 - Speed amplifier Module - INFRANOR

INFRANOR SMTBD1/1A-400/45 variable speed drive - SMT-BD1 series

The INFRANOR SMTBD1/1A-400/45 is a variable speed drive module in the SMT-BD1 series designed for precise control of AC synchronous servo motors. It targets OEMs and maintenance teams who require accurate speed and torque regulation with deterministic feedback. The drive operates around a nominal 565 V DC bus and delivers continuous output current up to 15 Arms, with 48 Arms available for 1 s peak events. Resolver feedback enables robust closed-loop vector control in demanding environments. With an analog ±10 V command interface, selectable speed loop bandwidth and an encoder emulation output in RS422, the SMTBD1/1A-400/45 integrates efficiently into new designs and retrofit projects where reliability, repeatability and fast commissioning are priorities. Its 6U double Eurocard construction combines an IGBT power stage and DSP-based control logic, providing a compact, serviceable format for cabinet installation.

Technical specifications

• Manufacturer: INFRANOR
• Series: SMT-BD1
• Model reference: SMTBD1/1A-400/45
• Category: Variable speed drive, servo drive module
• Motor compatibility: AC synchronous motors with resolver feedback
• Control modes: Closed-loop speed and torque control with resolver feedback, analog command ±10 V (12/16-bit)
• Nominal DC bus: 565 V DC, maximum 685 V DC
• Motor voltage class: 400 Vrms class motors
• Continuous current: 15 Arms without additional fan
• Peak current: 48 Arms for 1 s
• PWM switching frequency: 10 kHz
• Minimum motor phase inductance: 2 mH
• Speed loop bandwidth: selectable 50, 75 or 100 Hz
• Maximum motor speed: up to 14,000 rpm
• Command interface: analog ±10 V for speed or torque, external or internal current limit
• Feedback and I/O: resolver input, RS422 encoder emulation up to 8192 ppr, front fault indication
• Form factor: 6U double Eurocard, IGBT power board plus DSP logic board
• Power rating: application dependent, size selection by current and motor voltage

SMT-BD1 series overview

The SMT-BD1 series from INFRANOR comprises board-level servo variable speed drives engineered for cabinet integration in multi-axis motion systems. These modules are intended to pair with synchronous servo motors and standard industrial control hardware, delivering deterministic torque and speed regulation where cycle time, repeatability and thermal stability are essential. The series emphasizes robust feedback handling through resolver inputs and facilitates host control via analog setpoints and digital I/O. Encoder emulation on RS422 simplifies integration with automation controllers that require incremental feedback signals for position or speed supervision.

• Cabinet-mounted drive modules: Compact 6U double Eurocard format enabling dense layouts in existing racks or custom enclosures, with straightforward access for maintenance and replacement.
• Servo-focused architecture: Resolver-based closed-loop vector control for consistent torque delivery at low speed and stable operation at high speed, suited to precision motion and continuous-duty production.

Within this series, the SMTBD1/1A-400/45 addresses 400 Vrms class motors on a 565 V DC bus and offers current capabilities that fit mid-range axes. Selection is based on motor nameplate current and required overload characteristics rather than nominal kW, which ensures a correct match to thermal and dynamic demands.

Industrial applications

The SMTBD1/1A-400/45 integrates into a wide spectrum of motion applications where accurate velocity and torque regulation are prerequisites for productivity and product quality.

• Machine tools and CNC auxiliaries: Spindle support for appropriate power classes, feed axes on retrofit projects and auxiliary functions requiring resolver-based control.
• Packaging and converting: Web handling, unwind and rewind with adjustable speed loop bandwidth, encoder emulation for line synchronization.
• Material handling: Precision conveyors, indexing tables and pick-and-place units needing repeatable motion profiles.
• Textile and film lines: Tension-controlled drives where stable torque at low speed is required.
• General automation: Assembly stations and test benches interfacing to PLCs via ±10 V speed or torque commands.

Integration and communication

Commissioning is facilitated by analog setpoint control and selectable speed loop bandwidth at 50, 75 or 100 Hz, allowing the tuning of dynamic response to the mechanics and load. The resolver interface ensures robust feedback in harsh environments, while the RS422 encoder emulation up to 8192 ppr provides a standardized incremental signal to external controllers or counters. Current limiting can be driven internally or from an external reference, which helps protect both the motor and the mechanical transmission during transients and start-up phases. Fault indications are available on the front panel for quick diagnostics at the cabinet. The 10 kHz PWM switching frequency and the specified minimum motor inductance of 2 mH define a stable operating envelope and support low-ripple current at typical industrial speeds. Integration into PLC or CNC architectures is achieved through the analog ±10 V interface and discrete I/O, using the encoder emulation for speed or position feedback as required by the host system. The DC bus specification, 565 V nominal and 685 V maximum, aligns with common rectified three-phase supplies in industrial cabinets, enabling straightforward retrofit alongside existing power infrastructure. Where the motor voltage class is 400 Vrms, the module provides appropriate utilization while maintaining thermal margins.

Because the drive is specified by current capacity rather than a fixed kW label, sizing is performed from the motor nameplate current, duty cycle and overload profile. For high-inertia loads or frequent acceleration cycles, the 48 Arms 1 s peak capability provides margin for transient torque without sustained thermal stress. For continuous operation, the 15 Arms rating without additional fan defines the steady-state envelope. Observing the minimum phase inductance of 2 mH is essential to maintain current regulation stability at the 10 kHz switching frequency.

Availability and warranty

The INFRANOR SMTBD1/1A-400/45 variable speed drive is available from Standard Exchange Industry in reconditioned supply, standard exchange or repair service, each option tested on a dedicated bench and delivered with warranty according to the selected service. Worldwide shipping is organized within 24 to 72 hours to minimize downtime. Our technical team can assist in cross-referencing legacy modules, validating resolver compatibility and confirming current sizing relative to your motor and duty cycle. If your production line is stopped or an upgrade is planned, SEI provides a rapid, reliable path to restore motion control performance with documented test results and traceable processes.