PLEASE NOTE: Effective 2019, we no longer supply Control Techniques variable frequency drives and components. We have drives from several other manufacturers which can meet or exceed the performance characteristics of the Control Techniques line. Simply complete the form below, or contact us with the model of your current or obsolete Control Techniques drive and we’ll be glad to identify a suitable replacement.

Also, the Fincor and Saftronics lines of AC variable frequency drives, DC variable speed drives, and reduced voltage starters were once owned by Emerson but have been obsolete for several years. However, we have many years’ experience working with these drives and can quickly identify replacements capable of exceeding the quality and performance of these older drive technologies. For a suitable replacement, fill out the form below or contact us with your drive or application requirements, and we’ll handle it from there!

Unidrive SP

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Obsolete Drive Replacement RFQ -

If you need a replacement for an existing obsolete drive, complete the following form and we will send you a quote for a suitable replacement.

* Required

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Power Accessories


During deceleration, the mechanical energy stored in the spinning mass of the motor and load is converted to electrical energy, which recharges the drive’s DC bus. Dynamic braking resistors provide a means of rapidly dissipating that energy so that the drive does not fault from overcharging the DC bus. The ohmic value and power rating of the braking resistor is a function of the drive type and size.A zero-space braking resistor is available for heatsink mounting on Unidrive SP frame sizes 1 and 2. These resistors are designed for low-inertia loads commonly used in servo type applications. For higher-inertia loads, the heatsink mounted resistor may not have enough braking capacity, and a larger external resistor may be required. No thermal protection device is required with these heatsink-mounted resistor packages.
Control Techniques Unidrive SP AC Drive Opions. Size 1 Unidrive SP heatsink shown. Size 1 Unidrive SP heatsink shown
Unidrive SP Size DC Resistance Power Rating Order Code
1 75 Ohm 50W SM-Heatsink DBR1
2 37.5 Ohm 100W SM-Heatsink DBR2
(Drives Larger than Size 2 do not have this option)

Control Techniques Unidrive SP AC Drive Opions. Emergency Stop Duty Dynamic Braking


Panel mounted DB resistors are designed for non-cyclic use where energy dissipation from an active drive is required. Resistors are supplied with mounting hardware unless otherwise noted. See Options and Accessories section for details Control Techniques Unidrive SP AC Drive Opions. Cyclic Duty Dynamic Braking


These heavy-duty kits have been designed to provide dynamic braking for cyclic and continuous braking applications. See Options and Accessories section for details


Control Techniques Unidrive SP Power Accessories, External EMC Filters.EMC filters are used to minimize high frequency power supply line disturbances caused by PWM AC drives that may interfere with proper operation of sensitive electronic equipment. These specific filters have been assessed for conformance with the EMC directive by testing with the appropriate Control Techniques drives. The filters used with Unidrive SP have been designed to mount in either Footprint or Bookend dimensions, allowing the user to optimize panel space. See Options and Accessories section for details

Control Techniques Unidrive SP IP54 and IP55 Fan OptionsIP54 AND IP55 FAN OPTIONS

For those applications using through-panel mounting, and located in demanding enviornments, Unidrive SP can be fitted with optional fans providing either IP54 or IP55 Ingress Protection Ratings. The chart below lists the available fan options.

Unidrive SP Frame Size
IP54 Fan Option Order Code
IP55 Fan Option Order Code

Some additional parts are required for installation of these fans. Please contact Control Techniques Technical Support for details.

Control Techniques Unidrive SP Encoder Terminal Connector.ENCODER TERMINAL CONNECTOR

The 15 way D-Type Converter is used to simplify motor feedback wiring by “Breaking out” the 15-pin D-connector signals to screw terminals.

Description Order Code
Encoder Screw Terminal connector SM-ETC


New in 2005 and expanding in 2006 is the option of a conduit gland plate for Unidrive SP wall-mount drives. Currently, conduit mounting plates are available for Unidrive SP sizes 3, 4, and 5.

Unidrive SP Model Number Order Code
Size 3 CBOX-S3 960400-01
Size 4 and 5 CBOX-S4-5 960400-04

(Call factory for availability of conduit boxes for Unidrive SP sizes 1, 2 and 6)

Information provided by Control Techniques, a world leader in the design, production and marketing of electronic drives for the control of electric motors.