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Valve Motor Drive Controllers

The Partlow "VDM" process controllers have been designed specifically to drive valve motors with a unique tuning algorithm.  Use these controllers with motor actuated valves which open and close using a motor.  The position of the valve stem controls the flow through the valve.  the VDM controllers use the process variable as an input and then control the valve position to yield the proper flow or temperature for example.  These units consist work by using a continuous on-line open loop tuning to give stable control at all times.  Tuning the P and I terms with an auto-tune algorithm also reduces valve activity (hunting) to an absolute minimum without compromising the control quality.  This then reduces wear and tear on the mechanical components including the contactors, relays and valve parts. 

Standard Features

  • Dual 4 digit red display
  • Universal sensor input: thermocouple, RTD, mA, mV, or V
  • Full PID with Pre-Tune and Adaptive Auto-Tuning
  • Unique VMD tuning algorithm
  • Setpoint ramping
  • Configurable from an IBM compatible computer
  • 90 to 264V AC powered
  •  Valve motor dirive controller









Optional Features

  • Dual setpoint capability
  • Process or setpoint value retransmission
  • RS-485 Communications
  • 24V Transmitter power supply
  • 24V AC/DC line powered operation

Key Specifications

  • +/- 0.25% Accuracy
  • 4 Scans per second
  • 2A SPDT Relay main outputs
  • 2A SPDT Relay or SSR alarm output
  • IP65/NEMA 4 Panel mount sealing
  • 4.33" Panel depth - 1/16 DIN
  • 3.94" Panel depth - 1/8 & 1/4 DIN
  • 3 Year warranty

Agency Approvals

  • UL Recognized
  • UL Certified for Canada
  • CE Compliance






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MBH Engineering Systems 2008
Last modified: 29-Oct-2008