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

> Compact Stepper Driver. SCU5 Powered. Zero External Power Supply. SCU5-powered operation – receives both 24 VDC power and RS485 communication through a single pre-wired motor communication cable; no separate power supply needed

**Last updated:** 2026-10-06

**Source:** https://r2r.tech/products/motor-drivers/mc-qd-1140114112401241-2a-driver

---

> 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

## Documentation

**3D Model (STEP):** [MC QD 1140-1141-1240](https://r2r.tech/documentation/3d-models/mc-qd-1140-1141-1240.md)

**Additional documentation:**
- [Motor Driver MC QD 1140/1141/1161/1180/1181/1211/1230/1231/1240/1260](https://r2r.tech/documentation/manuals/motor-driver-mc-qd-1140114111611180118112111230123112401260.md)

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

---

## 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, with 0.0635 mm resolution and ±0.127 mm repeatability at line speeds up to 760 m/min — 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