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Control Techniques UD51

Rated 5/5 on 1 review

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MANUFACTURER: Control Techniques

DESCRIPTION: Small Option Module Second Encoder


11 in stock

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2 Year warranty

Part NumberUD51
ManufacturerControl Techniques
TypeOption Modules
Warranty2 Year
Option sizeSmall module
Option ModuleSecond Encoder
Encoder forUnidrive

Our Repair Services

MRO Electric repairs CNCs, PLCs, Servo/Spindle Drives, Motors, Amplifiers, VFDs, HMIs, and more, most of which can be repaired in only 3-5 days.

Repair Benefits

MRO can restore your failed UD51 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.

Our technicians have vast experience with most manufacturers and models. In addition to this UD51 we also repair a wide range of other Control Techniques products, so if you don’t see the model you need, please contact us.

Core Exchange

If you are interested in getting credit for your faulty UD51, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

  • Shipping Weight : 1lb

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Ask about exchanging your faulty UD51 for credit when ordering from MRO Electric

MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Control Techniques UD51 Overview

UD 51 Second encoder small option module for Unidrive These products are manufactured in United Kingdom and are designed for Metal production, paper processing, and material conveying usage. They come with a 2-year warranty from MRO Electric. We also carry Option Modules from other manufacturers such as Siemens and Yaskawa.

The small option module UD 51 Second Encoder facilitates the connection of a second encoder to a Unidrive. It is equipped with inputs for this purpose, as well as simulated-encoder outputs. This module can operate with standard quadrature encoders that have a maximum of 16384 lines per revolution, allowing a maximum operating frequency of 210 kHz, or up to 420 kHz for frequency and direction (F/D) signals.

Operating the UD 51

When operating in either Closed-loop Vector or Closed-loop Servo operating mode in a Drive, the UD 51 can provide speed and position feedback for position control or digital lock. It can also accept frequency and direction reference input signals. Additionally, the UD 51 comes with simulated encoder outputs, which usually use the second encoder as the source but can be reconfigured to use the main encoder (Encoder 1) connected to the 15-way D-type on the Drive as the source. These outputs produce quadrature AB signals that correspond to the line counts from the source encoder and can be configured for frequency and direction signals.

Installation of the Control Techniques UD 51 

To install, the UD51 must be fitted in the small option module bay of the Unidrive. All connections to the Drive are made by a multi-way connector. The connections from external equipment are made by a plug-in 16-way screw-terminal block on the UD51. Before installing the UD51 module in the Unidrive, it is important to follow certain steps to ensure proper installation. First, disconnect the AC supply from the Drive and wait for at least 10 minutes before proceeding. Then, inspect the UD51 to check for any external damage and ensure that the multi-way connector is free of dirt and debris. If the module is damaged or dirty, it should not be installed in the Drive.

Next, remove the terminal cover from the Drive as per the instructions provided in Chapter 2 of the Unidrive Installation Guide. Once the cover is removed, position the multi-way connector on the rear of the UD51 over the connector in the Drive and push the module into place using the thumb pad. Then, reattach the terminal cover to the Drive. After that, reconnect the AC supply to the Drive, and set parameter .00 to 149 to unlock security. Check that parameter 16.01 is set to 2, indicating that the module is properly installed. If the check in step 8 fails, there are several steps to take. The first thing to do is remove the AC supply from the Drive. Wait for at least 10 minutes and then remove the terminal cover. Ensure that the UD51 is fully inserted, replace the terminal cover, reapply the AC supply, and check again that parameter 16.01 is set to 2.

Contact Us Today For More Information About Control Techniques Products

Check out the rest of our Control Techniques product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like UD51, take a look at more from our Option Modules line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our UD51 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.

5 stars

4.9 Overall Satisfaction Rating

Over 1700 Ratings from Actual Customers

Read Our Reviews

Fast delivery and very good service.


Would use again. Received in timely manner.


Very happy with the overall service, delivery, communication and delivery,

Conley Cooke