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

Variable speed drive INFRANOR SMTBD1/1A-220/12 - SMT-BD1 series

The SMTBD1/1A-220/12 is a digital servo drive from the INFRANOR SMT-BD1 series, designed for precise speed and torque control of sinusoidal brushless AC servomotors in industrial automation. This speed amplifier operates from a single-phase 220 VAC input and delivers a nominal motor current of 12 Arms. It is equipped with a ±10 V analog speed input at 12-bit resolution, a PI2 speed regulator with selectable bandwidth, and a fast inner current loop exceeding 1 kHz. A 10 kHz PWM switching frequency ensures smooth torque production, while the system supports incremental encoder feedback and provides a programmable encoder output up to 8192 ppr. Auto-phasing and auto-tuning functions shorten setup time and stabilize performance. With a mechanical speed capability up to 14,000 rpm depending on the matched motor and application, the SMTBD1/1A-220/12 fits packaging, handling, winding, indexing, and general motion axes where repeatable speed regulation, robust torque response, and reliable feedback integration are required.

Technical features

• Manufacturer reference: SMTBD1/1A-220/12
• Series: INFRANOR SMT-BD1 digital speed amplifier
• Manufacturer: INFRANOR
• Type: Variable speed drive, servo amplifier for sinusoidal AC brushless motors
• Input supply: 220 VAC single-phase, 50/60 Hz
• Rated output current: 12 Arms (model /12)
• Speed command interface: ±10 V analog, 12-bit resolution, optional 16-bit on selected variants
• Control structure: PI2 speed regulator, selectable bandwidth settings 50 Hz, 75 Hz, 100 Hz
• Current loop bandwidth: greater than 1 kHz for fast torque response
• PWM switching frequency: 10 kHz
• Maximum mechanical speed: up to 14,000 rpm depending on motor characteristics
• Feedback: Incremental encoder interface with programmable output up to 8192 ppr
• Digital I/O: Logic inputs including Enable and limit functions for safe operation
• Acceleration and deceleration ramps: adjustable from 0 to 32 s
• Speed ratio: 2048:1 with 12-bit command resolution
• Tuning aids: Auto-phasing and auto-tuning functions for rapid commissioning
• Form factor: Typical SMT-BD1 series dimensions around 245 x 380 x 159 mm

SMT-BD1 series overview

The INFRANOR SMT-BD1 series addresses motion control requirements where a compact, deterministic servo drive with analog command and incremental encoder feedback is preferred. Deployed across legacy and modern installations, these drives bridge PLC-based control architectures and high-performance servomotors using a straightforward ±10 V interface. The architecture centers on a fast current loop for stable torque regulation and a configurable PI2 speed loop that can be adapted to machine dynamics. With a 10 kHz PWM, the series aims to reduce ripple and audible noise while maintaining thermal efficiency appropriate to cabinet-mounted equipment. Built-in auto-phasing aligns motor phases to feedback without manual swapping, and auto-tuning provides baseline parameterization that can be fine-tuned to achieve the desired bandwidth and overshoot. The series supports programmable encoder outputs, enabling compatibility with counters or motion modules that expect standardized incremental signals. These attributes make SMT-BD1 drives suitable for retrofit scenarios and for maintaining installed bases where the control strategy relies on deterministic analog references and discrete I/O handshakes rather than fieldbus-centric command structures.

• Analog-centric architectures: Ideal where the master control is a PLC or CNC providing ±10 V speed references and expecting encoder feedback for supervision.
• Serviceability: Clear functional blocks, tuning aids, and encoder programmability simplify maintenance and replacement in time-critical contexts.

The SMTBD1/1A-220/12 fits this philosophy by combining dependable current regulation with configurable speed control, thereby stabilizing process quality over a wide operating range without imposing complex commissioning workflows.

Industrial applications

This variable speed drive integrates into a wide variety of applications where consistent speed regulation, accurate torque response, and incremental encoder feedback are mandatory. Typical uses include axes with continuous duty as well as intermittent motion where settling time and repeatability are important.

• Packaging and converting: Web transport, unwind and rewind sections with speed matching and encoder-based supervision.
• Material handling: Synchronized conveyors, feeders, and transfer stations requiring smooth ramping and stable low-speed behavior.
• Indexing and assembly: Rotary tables and pick-and-place axes where repeatable speed profiles and quick stabilization improve cycle time.
• Textile and printing: Rollers and dancer-controlled sections that benefit from a responsive current loop and tuneable speed bandwidth.
• General motion on CNC and robotics auxiliaries: Auxiliary axes with incremental feedback and analog command frameworks.

Integration and communication

The SMTBD1/1A-220/12 interfaces natively via a ±10 V analog speed input and discrete logic I/O for Enable and limits, which simplifies coupling to PLCs, motion controllers, or dedicated CNC hardware that manage trajectory and sequencing. Incremental encoder feedback closes the loop and enables diagnostic supervision, while the programmable encoder output can feed counters or higher-level devices expecting standardized ppr values up to 8192. This approach minimizes dependencies on proprietary communication stacks and eases replacement in heterogeneous control environments.

Commissioning leverages auto-phasing to align motor and feedback, and auto-tuning to establish baseline gains, after which the PI2 speed regulator bandwidth can be selected to balance responsiveness and stability. Adjustable 0 to 32 s ramps align acceleration and deceleration with mechanical constraints, reducing shock and extending component life. Where required, technicians can refine parameter sets to match load inertia and damping without departing from the established control topology.

Availability and warranty

The INFRANOR SMTBD1/1A-220/12 variable speed drive is available from Standard Exchange Industry in reconditioned supply or exchange services, functionally tested on dedicated benches and delivered with a warranty according to the selected service. SEI ships within 24 to 72 hours to more than 120 countries. If your production is at risk due to a drive failure or obsolescence in the SMT-BD1 range, our technical team can help confirm compatibility, advise on commissioning parameters, and propose the most suitable replacement or repair path.