SMT100/05 - Speed amplifier Module - INFRANOR

INFRANOR SMT100/05 variable speed drive, SMT-100D series

The SMT100/05 is a digital DC variable speed drive module from the INFRANOR SMT-100D series, designed for precise speed regulation of brushed DC motors in industrial automation. It addresses maintenance and retrofit needs where stable speed control, compact form factor and straightforward integration with a programmable logic controller are required. With a 40 to 130 VDC bus, nominal armature current of 2.5 A and approximately 5 A peak capability, the module ensures consistent speed control through a PI regulator. A ±10 V analog command with 10-bit resolution, combined with either sensorless back-EMF detection or incremental encoder feedback, facilitates deterministic control across a wide operating range. The SMT100/05 is intended for single-, four- or six-axis racks powered by the MP/DR100A supply from a 230 VAC input, making it suitable for multi-axis machines, process lines and equipment where quick replacement minimizes downtime.

Technical specifications

• Manufacturer part number: SMT100/05
• Series: SMT-100D digital DC speed drive modules
• Manufacturer: INFRANOR
• Type: Modular DC variable speed drive for multi-axis racks
• DC bus supply: 40 to 130 VDC
• Nominal output current: 2.5 A
• Peak output current: approximately 5 A
• Output voltage: PWM armature voltage from 0 up to bus level, matched to DC motor
• Control mode: PI speed regulation with ±10 V analog reference, closed loop with encoder or sensorless via BEMF
• Speed range: up to 3000 rpm typical with encoder feedback (application-dependent)
• Feedback: incremental encoder, minimum 1000 ppr, or back-EMF observer
• Minimum motor inductance: 1 mH
• Modulation efficiency: greater than 85%
• Logic I/O: negative enable or disable, limit switches, zero command input
• Parameterization: serial service link, 10-bit command resolution, parameters such as KP, KI, FC stored in EEPROM
• Rack and supply: compatible with single, 4 or 6-axis racks using MP/DR100A supply from 230 VAC input
• Form factor: approx. 35 × 170 mm module, about 0.5 kg
• Power rating: depends on DC bus and motor, not specified by manufacturer

SMT-100D series overview

The SMT-100D series groups compact speed amplifier modules for brushed DC motors, designed to deliver accurate velocity control with minimal footprint. The architecture favors modular integration into multi-axis racks, with common power input and straightforward wiring of analog setpoints and digital interlocks. It is particularly suited to installed bases where DC motors remain prevalent and a serviceable, configurable drive is required.

• SMT-100D speed modules: digital PI speed loop, ±10 V reference, encoder or BEMF feedback, EEPROM-stored parameters for repeatable commissioning and maintenance.
• Rack and supply ecosystem: operation in single or multi-axis racks powered by MP/DR100A from 230 VAC single-phase or three-phase sources, enabling dense axis counts with shared infrastructure.

The SMT100/05 belongs to this platform and targets machines requiring stable speed control rather than torque-oriented servo operation. It provides predictable dynamics, simple tuning via KP and KI, and consistent behavior across identical axes.

Industrial applications

This variable speed drive integrates into numerous DC-based applications where reliable speed regulation and compact modules are preferred. It is appropriate for maintenance replacements, modernization and creation of multi-axis sets driven by a central supply and coordinated by a PLC or CNC controller.

• Conveyors and feeders: speed regulation for material handling with start, stop and interlock management.
• Unwind and rewind systems: velocity control of DC rolls where stable speed is required upstream of tension control.
• Packaging equipment: synchronized DC axes for infeed, outfeed or auxiliary movements in multi-axis racks.
• Test benches and lab machinery: repeatable speed profiles using ±10 V setpoints from a programmable logic controller or function generator.
• Retrofit of legacy DC axes: replacement of obsolete DC controllers while retaining existing motors and encoders.

Integration and communication

The SMT100/05 is controlled by a standard ±10 V analog reference from a PLC, motion controller or CNC, with digital inputs for enable or disable, limit switches and zero command. Feedback can be selected between incremental encoder, minimum 1000 ppr for high-resolution closed-loop operation, or back-EMF for sensorless regulation when encoder signals are unavailable. Commissioning involves tuning PI gains (KP, KI) and limits (FC) through the serial service link, after which values are saved in EEPROM to secure consistent behavior at restart.

In automation architectures, the module interfaces naturally with analog I/O cards and safety interlocks. Where AC applications use a variable frequency drive, this unit covers DC motor speed control with comparable ease of wiring. For servo-like performance on DC axes, encoder feedback and careful PI tuning provide stable dynamics. No fieldbus card is required for operation, and remote supervision can be implemented through the host PLC using standard analog and digital signals.

Availability and warranty

Standard Exchange Industry supplies the INFRANOR SMT100/05 in refurbished or exchange configurations, functionally tested on dedicated benches. Shipment is organized within 24 to 72 hours to more than 120 countries. Depending on the selected service, coverage ranges from 6 to 24 months. Our technical team assists in cross-referencing the exact rack format and MP/DR100A supply compatibility, verifying the encoder interface and advising on parameter transfer to reduce commissioning time and secure a like-for-like replacement on your production line.