# MC QD 1140/1141/1240/1241 2A Driver

> Compact Stepper Driver. SCU5 Powered. Zero External Power Supply.

**Last updated:** 2026-03-07

**Source:** https://r2r.tech/products/motor-drivers/mc-qd-2a

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> Compact Stepper Driver. SCU5 Powered. Zero External Power Supply.

## Specifications

| Specification | MC QD 1140/1141/1240/1241 |
| ------------- | ------------------------- |
| Driver Type | Bipolar stepper motor driver |
| Microstep Resolution | 256 microsteps per full step |
| Maximum Motor Current | 2.8A per coil (RMS) |
| Input Voltage | 24 VDC (from SCU5 controller) |
| Communication | RS485 via M8 4-pin twisted pair |
| Actuator Output | M12 4-pin female (bi-polar 4-wire stepper) |
| Servo Center Input | 24V NPN inductive proximity sensor (NO or NC) |
| Limit Switch Inputs | 2x normally-closed (M8 6-pin connector) |
| Sensor Connector | M8 6-pin male |
| Power Source | SCU5 controller (via motor communication cable) |
| Housing | Aluminum wall-mounting enclosure |
| Reverse Polarity Protection | No — ensure correct SCU5 power polarity |
| Compatible Actuators | LHS-005, LHS-020 (up to 200 lbf) |
| Compatible Controllers | SCU5 MD / SCU5 MCD |

## Features

- SCU5-powered operation – receives both 24 VDC power and RS485 communication through a single pre-wired motor communication cable; no separate power supply needed
- High-precision 256 microstep driver – constant current driver with 256 microsteps per full step for smooth, vibration-free actuator motion
- Automatic parameter initialization – driver parameters are stored in the SCU5 controller memory and loaded to the driver on every power-up
- Ramp profile generation – generates acceleration/deceleration ramp profiles based on speed and acceleration settings for controlled actuator positioning
- Electronic stroke limits – configurable step counts for electronic stroke limits to protect the actuator from over-travel
- Servo center input – M8 6-pin connector supports a 24V NPN inductive proximity sensor for home/servo center positioning
- Limit switch inputs – two normally-closed limit switch inputs to restrict actuator travel in either direction; can be tied together for a single enable/disable switch
- Bi-polar stepper output – M12 4-pin female connector drives bi-polar 4-wire stepper motors up to 2.8A per coil
- Flexible mounting – compact aluminum enclosure mounts in a machine cabinet or on the machine frame; wall mounting brackets included
- Quick disconnect connectors – all connections use industrial M8 and M12 connectors for fast, reliable installation

## Benefits

- Eliminate external power supplies – the MC QD 2A driver is powered directly from the SCU5 controller, reducing component count, cabinet space, and installation time
- Simplify wiring and commissioning – one pre-wired cable carries both power and communication; plug in and go with no separate DC supply to wire or fuse
- Stop losing precision at low speeds – 256 microstep resolution keeps the actuator smooth and vibration-free even at crawl speeds during fine positioning
- Prevent actuator over-travel damage – electronic stroke limits and hardware limit switch inputs provide dual-layer protection against mechanical damage
- Reduce downtime with quick disconnect – industrial M8/M12 connectors allow fast driver replacement without re-wiring; swap and run in minutes

## Applications

- Intermediate web guides for converting, coating, printing, and packaging lines
- Low-profile web guide installations where space is constrained
- Web guide upgrade kits replacing pneumatic or hydraulic actuators
- Compact web guiding systems for narrow-web applications
- Any application using LHS-005 or LHS-020 actuators with the SCU5 controller

**Tags:** Motor Drivers, MC QD 2A

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## About Roll-2-Roll Technologies

Roll-2-Roll Technologies designs and manufactures patented fiber-optic web position sensors and advanced web guiding controllers — the precision measurement and control core of modern roll-to-roll manufacturing. Spun out of Oklahoma State University's Web Handling Research Center and trusted by Fortune 500 medical, battery, and nonwovens manufacturers, our patented sensors work without recalibration at ±0.1mm accuracy up to 760 mpm — typical customer outcomes are 50%+ less downtime and payback under six months. Headquartered in Stillwater, Oklahoma, our team of PhDs, controls engineers, and industry veterans extends the sensor + controller core into complete web guide systems including stepper-motor-based linear actuators (RLA, BLA, LHS).

- Website: https://r2r.tech
- Phone: +1 (888) 290-3215
- Email: sales@r2r.tech