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!

Commander SK

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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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Input / Output

SM-I/O LITECommander SK SM-I/O Lite

Additional I/O

  • 1 Analog Input – 0.1 % Resolution (+/- 10V, 4-20mA or 0-20mA)
  • 1 Analog Output – 0.4% Resolution (0-10V, 4-20mA or 0-20mA)
  • 3 Digital Inputs (if the encoder reference port is used there are only 2 digital inputs available)
  • 1 Encoder Reference Port (55kHz Quadrature or 110kHz F/D) *
  • 1 Relay Contact
  • 24 Volt I/O supply
  • 5 Volt Encoder supply

SM-I/O TIMERCommander SK SM-I/O Timer

Additional I/O with Real Time Clock

  • I/O specification as per SMI/O Lite Module
  • Real Time Clock / Calendar with the following format: Year-Month / Date – Date of Week / Hours (24) Minute / Second
  • Day Light Savings Mode
  • Battery Back Up
  • User Adjustable Time


Commander SK SM-I/O PELVChemical industry conformance to NAMUR NE37 gives security in demanding application enviornment. This module provides PELV (Protective Extra Low Voltage) double insulated digital and analog I/O to meet IEC 61131-2, Clause 3.3.1 Type as well as NAMUR NE37 specifications for chemical industry applications.

  • Analog Input (4-20mA or 0-20mA)
  • 1 Analog Output (4-20mA or 0-20mA)
  • 1 Digital Input
  • 4 Digital Input/Output
  • 2 Relay Contact (2A @ 240VAC, 4A @ 30VDC)

SM-I/O 120VCommander SK SM-I/O 120V

This module provides digital I/O rated for 120 or 240VAC for the Unidrive SP. These I/O conform to IEC 61131-2 120VAC standard.

  • 6 Digital Input (120VAC or 3 Digital Inputs @ 240VAC)
  • Relay Contacts (2A @ 240VAC, 4A @ 30VDC)


Description Order Code
I/O Expansion SM-I/O Lite
I/O Expansion SM-I/O Timer
Double insulated I/O Expansion SM-I/O PELV
120 Volt AC I/O Expansion SM-I/O 120V

Commander SK SM-I/O Devices

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