SMTBD1/1A-220/04 - Speed amplifier Module - INFRANOR

INFRANOR SMTBD1/1A-220/04 variable speed drive, SMT-BD1 series

The reference SMTBD1/1A-220/04 is a variable speed drive module from the SMT-BD1 series by INFRANOR, designed for sinusoidal brushless AC motors equipped with a resolver. In industrial environments where precise speed regulation and stable torque delivery are required, this module provides deterministic control from a ±10 V analog command. It is suitable for modernization, replacement and OEM builds where a compact servo drive with resolver feedback, encoder emulation and straightforward commissioning is preferred. The unit implements a programmable speed loop, supports a wide mechanical speed window from low rpm to high-speed spindles, and offers serial-based parameter management with EEPROM storage. Error codes are displayed locally on the front panel to accelerate diagnostics. This product is well suited to applications that demand consistent speed holding, robust start-stop behavior and accurate feedback handoff to a PLC, CNC or motion controller without adding complexity to the fieldbus architecture.

Technical specifications

• Manufacturer reference: SMTBD1/1A-220/04
• Series: SMT-BD1 speed amplifier, variable speed drive for AC brushless motors
• Manufacturer: INFRANOR
• Control mode: Analog ±10 V command for speed or torque, internal current loop, programmable speed loop bandwidth
• Programmable speed range: 100 to 14,000 rpm, ratio up to 2048:1 (12-bit) or 32768:1 (16-bit option)
• Speed loop bandwidth: 50, 75 or 100 Hz, selectable
• DC bus supply: 310 VDC nominal, operating window 270 to 340 VDC
• Auxiliary supply: 200 to 340 VDC
• Feedback: Resolver input for commutation and speed estimation
• Encoder emulation: Quadrature A, B with index, up to 8192 ppr at 900 rpm, 4096 ppr at 3600 rpm, 1024 ppr at 14,000 rpm, accuracy 8 arc-min plus 1/4 count
• Logic inputs: Enable, positive and negative end limits FC+ and FC-
• Analog I/O: Speed command ±10 V, speed monitor ±8 V scaled to 14,000 rpm, current command ±10 V
• Parameterization: Serial link configuration, EEPROM storage, auto-configuration and auto-tuning available
• Status and faults: Error indication on front panel for rapid troubleshooting
• Output power: Depends on motor and configuration, not specified for this variant

SMT-BD1 series overview

The SMT-BD1 series groups resolver-based servo variable speed drives intended to regulate either speed or torque from a standard ±10 V reference generated by a PLC, motion controller or CNC. By natively handling resolver feedback and providing encoder emulation, these modules fit seamlessly into existing automation where counters, position latches or speed meters rely on A/B signals. The DC bus architecture around 310 VDC supports efficient energy transfer, while programmable bandwidths allow adaptation to rigid or compliant mechanics. Commissioning is facilitated by serial access, non-volatile memory and automatic identification routines that shorten setup times on maintenance interventions.

• Speed control mode: The drive maintains commanded rpm with a selectable bandwidth to balance disturbance rejection and noise, suitable for conveyors, winders and process lines requiring stable surface speed.
• Torque control mode: The unit accepts a torque reference via the ±10 V input to deliver controlled current, relevant for tension regulation, press feeding or applications where material constraints dictate the load.

When integrated as a servo-variable frequency drive within legacy or mixed-vendor architectures, the SMT-BD1 series offers predictable behavior, consistent diagnostic reporting and encoder-compatible outputs that simplify handshakes with PLC high-speed inputs or CNC interpolation cards.

Industrial applications

This variable speed drive addresses a wide range of motion tasks in factory automation. Typical deployments span continuous processes and discrete manufacturing where deterministic speed or torque is essential for quality and repeatability.

• Machine tool and spindles: Regulation of auxiliary axes or high-speed spindles within 100 to 14,000 rpm envelopes.
• Packaging and converting: Roller drives, web handling with torque control for tension stability and accurate line speed tracking.
• Conveyors and material handling: Consistent transport speed with enable and end-limit management for safe sequencing.
• Winding and unwinding: Use of torque reference for constant tension across diameter changes, encoder feedback to the PLC for register alignment.
• Robotics and gantries: Brushless axis actuation in systems that rely on resolver feedback and A/B encoder emulation to synchronize motion.

Integration and communication

The SMTBD1/1A-220/04 interfaces cleanly with automation controllers through a ±10 V analog input for speed or torque reference, enable and limit logic inputs for permissives, and an encoder emulation output that feeds PLC high-speed counters or CNC capture inputs. The serial link is used to set parameters, manage auto-tuning, and store configurations in EEPROM for repeatability across drives. Speed monitoring is available as a scaled analog output, facilitating commissioning with a simple multimeter or oscilloscope. The DC bus at 310 VDC and the auxiliary supply range 200 to 340 VDC demand proper wiring practices, protective grounding and attention to energy dissipation consistent with site standards. Faults are presented on the front panel, allowing maintenance teams to identify wiring errors, feedback issues or permissive states without external tools.

For facilities standardizing on variable frequency drives with analog control, the SMT-BD1 series serves as a resolver-based servo drive that bridges legacy analog motion loops and modern PLC or CNC supervision. In multi-axis installations, the programmable bandwidth (50, 75 or 100 Hz) permits harmonized dynamic behavior across axes with different inertias. Where power ratings are installation-specific, selection should be aligned to motor nameplate current and application dynamics. The absence of a mandatory fieldbus keeps integration straightforward, while encoder emulation preserves existing position and speed supervision logic in the host controller.

Availability and warranty

This INFRANOR SMTBD1/1A-220/04 variable speed drive is available from Standard Exchange Industry as refurbished supply or in standard exchange, functionally tested on a dedicated bench and covered by a warranty. Shipment is typically organized within 24 to 72 hours to support urgent maintenance requirements. If your production line is stopped, our technical team can validate compatibility with your motor and resolver, clarify the commanded mode, and advise on parameter transfer using the serial interface. Repair service is also available for the SMT-BD1 series, enabling cost-effective extension of installed base life while maintaining control performance and safety interlocks.