Category Archives: Unidrive

UNI3404: Beyond the User Manual

The UNI3404 is available with a number of option modules, which increase its flexibility and make it suitable for a very wide range of applications. These modules are briefly described in the following paragraphs. For full details refer to UNI3404 manual that is supplied with each of them. The modules are in two physical formats and are known as Large Option Modules (LOM) and Small Option Modules (SOM). Each Undrive may be fitted with one LOM and one SOM.

Unidrive UNI3404 Large Option Modules
  1. UD78 High Precision Analog Input Module. (LOM):
    • This module provides the following features: a) Infinite resolution analog input for precision speed and position control. Large Option Module Small Option Module 1. Introduction 11 b) RS485 communication port. c) Back up supply connector (requires user provided 24VDC) to maintain power to the drive control circuits and encoder feedback when the 3 phase input to the drive is disconnected.
  2. UD70 Co-Processor Module (LOM)
    • The UD70 is an Intel 960 based co processor module that allows the user to write programs in both IEC1131 ladder / Function Block Diagram and Drive Programming Language (DPL) to provide 1.5 axis motion control and sequence control. This is accomplished using the SyPT programming tool on a PC. The module is fitted with an RS232 programming port for this purpose. It also has an RS485 port for general use and this supports the ANSI protocol as a slave or master controller and ModBus RTU as a slave only.
  3. UD71 Serial Communications Module (LOM)
    • The UD71 provides simple serial communication and has both RS232 and RS485 ports.
  4. UD73 Profibus Interface Module (LOM)
    • The UD73 provides full UD70 co-processor functionality and additionally allows the drive to be connected to a Profibus DP network running at speeds up to 1.5 Mbaud.
  5. UD74 Interbus-S Interface Module (LOM)
    • The UD74 provides full UD70 co-processor functionality and additionally allows the drive to be connected to an Interbus-S network at a fixed data rate of 500 Kbaud.
  6. UD75 CTNet Interface Module (LOM)
    • The UD75 provides full UD70 co-processor functionality and additionally allows connection to a CTNet nework. CTNet is Control Techniques fully de-centralized peer to peer fieldbus. This allows implementation of a fully distributed control system with no central PLC controller required.
  7. UD76 Modbus Plus Interface Module (LOM)
    • The UD76 provides full UD70 co-processor functionality and additionally allows connection to a Modbus Plus network.
  8. UD77 DeviceNet interface module (LOM)
    • The UD77 provides full UD70 co-processor functionality and additionally allows connection to a DeviceNet network.
  9. CAN interface module
    • This is based on the UD77 hardware but has different firmware to allow the user to communicate through the CAN physical layer but using his own protocol written using the SyPT toolkit.
  10. CanOpen interface module
    • This is based on the UD77 hardware but the firmware is changed so that the network uses the CanOpen protocol.
Unidrive UNI3404 Small Option Modules
  1. UD50 Extended I/O module
    • This module provides the following additional I/O capability:
      • a) qty. 3, 24VDC digital inputs.
      • b) qty. 3, dual function (user selectable) 24VDC digital inputs / outputs. Rated at 30mA when configured as outputs.
      • c) qty. 2, 10 bit plus sign analog inputs +10 to –10VDC
      • d) qty. 1, analog output +10 to –10VDC.
  2. UD51
    • Second encoder module In servo mode this provides the drive with the following additional capabilities:
      • a) Allows use of a second incremental encoder as a master reference input for digital lock, Electronic Gear box and camming functions.
      • b) Alternatively the UD51 may be configured for frequency and direction input to be used as the drive speed reference.
  3. UD52 Sin/Cos encoder module
    • The UD52 allows a servomotor fitted with a sin/cos encoder to be used. This provides an interpolated resolution of up to 1,048,576 ppr when used with a 512 pulse sin cos encoder and also allows use of an optional 4096 revolution absolute encoder. The Unimotor is available with these encoders fitted as a standard option.
  4. UD53 Resolver Module
    • The UD53 allows use with a servomotor having resolver feedback. This is much more rugged than an encoder and therefore suitable for use in harsh environments. The UD53 can operate with resolver having either 2:1 or 3:1 turns ratio (primary : secondary)
  5. UD55 Cloning Module
    • The cloning module is intended to make it possible to copy up to 8 different parameter sets and subsequently load any of these onto another drive. It is useful in a production environment when many drives have to be set up with the same parameters. Unlike the other small option modules it is not normally left permanently installed in a drive.


Contact us today for an instant quote on any Control Techniques Unidrive, small option module, or large option module at 1-800-691-8511 or at


UD75 Configuration and Setup

You can check out our previous blog post  on the UD75 here for more information.

UD75 Configuration
  1. Isolate the drive from the mains supply and allow 5 minutes for the DC Bus capacitors to discharge.
  2. Insert Large Option Module as shown below. Ensure that it is correctly inserted. The module will click firmly into place.
  3. To remove the module, pull on the black tab, and the module will disengage from the connector and pull out of the drive.
UD75 Configuration: Cable Screen
The screen of the cable at every node on the network MUST be connected to the screen terminal (pin 3) on the CTNet terminal block. When the screen is stripped back to connect the twisted pair to the CTNet terminals, keep the exposed section of the cable as short as possible. On the CTNet PC Interface Adapter Card, there is no screen terminal. The screen should be cut and taped back to prevent it coming into contact with any other surfaces. The on-board terminal resistor should not be connected.
UD75 Configuration: Network Termination
The network MUST be fitted with terminating resistors AT BOTH ENDS!!! If resistors are not fitted, the network appear to work OK, but the noise immunity of the network will be drastically reduced. The terminating resistor value should match the nominal characteristic impedance value for the cable; in the case of the customized CTNet cable, the terminating resistors used should be nominally 78Ω. PC ISA and PCMCIA cards for interfacing a PC to CTNet are available from CT SSPD.


For price and ordering info you can email or call 1-800-691-8511. We have these and all the other Unidrive Classic option modules in stock, along with the drives themselves.

UD75 Configuration
UD75 Configuration

UD73 Configuration and Setup

You can check out our previous blog post on the UD73 here for additional setup and configuration info.

For UD73 configuration, most common parameters are arranged in one concise menu. Hundreds of user-configurable functions separated into 20 logical menus provide quick setup for advanced application. For positioning, ratio control, camming and multi-axis systems, plug-in option modules easily extend the Unidrive’s capabilities. High horsepower Unidrives cover the range from 200 to 1600 HP. The 300 amp power module and control pod (the “brain”) are available as components. They are also available as a packaged drive solution that includes fusing and a disconnect. (See our Packaged Drive Section, pages 120-123 and 128-133.) With the UD73’s extensive selection of communication, application, feedback and I/O modules, you can easily upgrade the performance of your drive. Yet, it is simple to configure by using the drive keypad, a remote keypad (CTKP), or UniSoft, the UD73 Windows based drive set-up tool. You can tailor each Unidrive to be the drive you want when you want it.
  • Digital AC Drive
  • 1 to 30 HP, 3 Phase, 208-230 VAC
  • 1 to 1600 HP, 3 Phase, 380-460 VAC
  • Five operating modes
    • V/Hz
    • Open loop vector
    • Closed loop vector
    • Brushless AC servo
    • Regenerative
  • UniSoft Windows based configuration tool
  • Configurable analog and digital I/O
  • Complete Motor Solutions


The UD73 configuration is suited for use with AC brushless servo motors. Servo control is ideal for applications requiring load transfer to and from any position, at any speed. The UD73 is designed for both stand-alone and multi-axis system applications.
In regen mode, two standard UD73’s operate together to provide full four-quadrant control of an AC motor. The system consists of two basic sub-systems, one being a Unidrive operating in any of its standard operating modes (open loop, vector or servo), and the other is a Unidrive operating in its regenerative mode. The link between the two sub-systems is simply the DC bus connections. In this mode, the UD73 is capable
of either supplying power to the DC bus of the Unidrive controlling the motor or removing power from the DC bus of the Unidrive controlling the motor and returning it back to the power line.
If you would like to order a module or get more info you can email or call 1-800-691-8511.

UNI1405 Configuration and Setup

You can check out our previous blog post on the UNI1405 parameters and manual here with additional setup info.

With the UNI1405 configuration, the volts / frequency ratio must be kept constant to ensure rated torque is available from the motor over the frequency range. At low frequencies (from 0 Hz to ½ x Pr 5.06) the voltage is increased from this characteristic by a level governed by either the voltage boost parameter or the motor parameters (found during the stator resistance test) depending on whether the drive is in fixed boost or open loop vector mode as shown aside.

UNI1405 Motor Rated Power Factor

The power factor is found by the UNI1405 4kw during the autotune procedure. It is used in the open loop vector algorithm and to set the current limit levels for the torque producing (active) current.

Emerson UNI1405 4kw Motor Rated Speed

The motor rated speed parameter should be set to the synchronous speed of the motor minus the slip speed. This is often displayed on the motor nameplate. I.e. For a typical 18.5 kW, 50 Hz, 4 pole motor the motor rated speed is 1465 rpm. The synchronous speed for a 4 pole motor is 1500 rpm therefore the slip speed is 35 rpm Synchronous speeds for different numbers of poles are as follows:
2 pole = 3,000 rpm
4 pole = 1,500 rpm
6 pole = 1,000 rpm
8 pole = 750 rpm
The accuracy of this parameter is very important as it directly affects the torque produced at the shaft. Often the value given on the motor nameplate is not
100% accurate which can lead to a loss of torque.
For ordering info or a UNI1405 price you can call 1-800-691-8511 or email
UNI1405 Configuration
UNI1405 Configuration

UNI2403: Beyond the User Manual

The Control Techniques UNI2403 Unidrive is a size 2 Unidrive with 5.5kW, 10HP, a 25A output and 19.8A input. The versatile Unidrive was the first universal AC drive capable of providing V/Hz, open, and closed loop vector, servo, and regen control in every unit. The unidrive combines all five of these AC drive technologies into one for the ease of the customer.

For quick setup of basic applications, the UNI2403’s most common parameters are arrange in one main menu. There are hundreds of user-configurable functions that are separated into 20 logicial menus which provides quick setup for advanced apps.

For more info you can email or call 1-800-691-8511. The product page for the for this drive is here.

UNI2403 Dimensions
UNI2403 Dimensions

Unidrive Security Code Basics

For some new User’s of Unidrives, the parameter security system is sometimes found to be a rather mysterious subject.  This article will attempt to unveil those mysteries with some help to explain the Unidrive Security Code Basics.

Security Basics

Without entering the basic security code, 149, you will only be able to view Menu 0 parameters.   The “as shipped” security code for the Unidrive is 149. To enter this code you would maneuver to #00.00 and enter 149.   Once this security code is entered, you will be able to maneuver throughout the Unidrive menu structure freely to view parameters.

After a security code is entered, it will remain in effect until power is removed from the drive or if you wish to re-establish this security, you can set  #XX.00 to 2000.  (where  XX means  “any menu”  )

The User Security Code parameter is #11.30.  The “as shipped” value in this parameter is 149.

For more info you can check our webpage here, or email or call 1-800-691-8511.

If you find that you cannot change R/W (Read/Write) parameters (including those in Menu 0), someone has most likely assigned their own security code.

User Security Code Assignment

User’s can assign their own 3 digit security code within the range of 1-255 by placing it into #11.30 (writing over the 149) and performing a STORE.1 Note that this does not eliminate or change the “Normal security” code number – 149.

From this point forth, access to parameters will require that code to be placed into #XX.00.  At this point you only have access to Menu O. After this code is entered, you must still enter the normal access code (149) to gain access beyond Menu 0 parameters ( full access).

These security methods do not affect serial communications.  Security affects only access to parameters through the keypad on the front of the Drive.

Forgotten Security Codes

People often forget their security codes.   A User assigned security code is not visible at #11.30 via the serial port (you would still see 149).  To retrieve the forgotten security code,  you must go in through the “back door” .

“The Back Door”

To obtain the forgotten security code, you can DEPRESS and HOLD the MODE key, LEFT ARROW key and either UP or DOWN Arrow key then APPLY POWER to the drive.   The User security code number should appear on the data display at #00.00. Normally, the drive displays the contents of parameter #0.10 upon application of power therefore the User security code may not immediately appear.  You must use maneuver to #00.00 to see the forgotten security code then enter it (hit the mode button twice).

Security Bypass 

During initial start-up of the drive, having to enter the security code after each power-up can become a nuisance and slow down the start-up process.   To bypass or eliminate the need to enter a security code, one can accomplish this by placing a 0 into parameter #11.30 and performing a Store.
If this bypass is done to speed up the start-up process, you should remember to re-assign the 149 default to #11.30 (and Store) before leaving the job site. Otherwise, the drive will have no parameter access security.
Note: Defaulting the drive parameters (using 1244 or 1254) does not reset the User security code.  A previously assigned code by the User will remain in effect even after defaulting parameters.

Additional information     

Parameter 0.49 Security Status
Coding:  RO, U Range:  0 to 1000
This parameter indicates the current status of the drive parameter security system. Each digit indicates a particular aspect of security as follows:-

Units digit:  0 = Standard security has been unlocked    1 = Standard security is still set

Tens digit:                0 = User security has been unlocked or is not active    1 = User security is active preventing RW access

Hundreds digit: 1 = Parameter 11.30 not equal to 149*

Thousands digit: 1 = Parameter 11.30 equal to zero*

* The value of 11.30 is the last value written by the user. Parameter 11.30 always appears as 149 when first accessed by the keypad to hide the real value last written by the user. If 11.30=149 then user security is cleared. If 11.30=0 then user security and security preventing access outside menu 0 is cleared.

Note: – In contrast to all the other parameters in menu 0, this parameter does not exist in any other menu.

Control Techniques Unidrive Option and Solution Modules

Option Modules for Unidrive SP, Commander SK, Affinity, Digitax ST and Mentor MPControl Techniques Option Modules The Control Techniques Unidrive Option and Solution Modules  will enhance the functionality of your variable speed drives, allowing them to consistently run at peak performance. The modules will easily integrate with your existing automation system.  A high speed parallel bus is used between the drive and the module which helps remove delays and will improve the drives reaction time.  The options offered by Control Techniques can be categorized by the following:

  • Intelligence and Safety – offering programmable automation and motion option modules
  • Communication – offering Ethernet and fieldbus communications option modules
  • Feedback – offering encoder and resolver option modules
  • Inputs and Outputs – offering additional analog and digital input and output option modules

Continue reading Control Techniques Unidrive Option and Solution Modules

Control Techniques UNIDRIVE Alarm and Status Indications

control-techniques-unidriveWhen there is a critical condition detected in your Control Techniques UNIDRIVE, the drive will continue to operate, but the lower display’s status indication will be replaced by an alarm indication. When an HF trip takes place, the Drive Healthy relay will open and serial communications will not function. It is important to give attention to alarm indications, because if an issue is not corrected, the drive could trip.

Refer to the guide below to help identify what kind of error your UNIDRIVE may be experiencing. A comparison chart with status indications is also provided to help identify what happens at each stage of operation.
Continue reading Control Techniques UNIDRIVE Alarm and Status Indications