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MD40 / MD50 Digital DC Drive

Introduction to Digital Drives

MD40 / MD50 Digital DC Drive

Introduction to Digital Drives


The MD Plus is a field-programmable closed loop DC drive system employing an advanced velocity-form PID algorithm for accurate and responsive control. The MD Pluswith -420 Option offers an isolated 4-20mA input and output for easy integration with existing Process Control systems. The MD Plus is ideally suited for metering pump applications by efficiently combining all of the application requirements into a single compact package. The MD Plus with -420 Option not only accepts a 4-20mA signal to control the pump speed, but it also provides a 4-20mA output signal back to the Process Control that is proportional to the actual running speed. Both the input and output signals are isolated from each other and from the control itself.

The NEW -51 Option adds serial communication capability to all models in the MD Plus Series.  RS232 and RS485 protocols are supported.

The MD Plus system also has two field-programmable Form C relay contacts that can be set to indicate a wide variety of conditions such as the pump is running, a “fault” condition exists, and many other events. The MD plus system is available in both enclosed and panel-mount versions. The MD50E-420 version comes in a NEMA 4 enclosure complete with an auto/off/manual switch on the cover. The 1/8 DIN MD40P and 1/4 DIN MD50P panel-mount versions come complete with a NEMA 4X rated faceplate, gasket kit, stainless steel mounting hardware, and connections for an external auto/manual switch.

MODEL NUMBER STYLE INPUT (VAC) OUT (VDC) HP RANGE
MD40P-420 (4-20mA IN/OUT) 1/8 DIN PANEL MOUNT 120/240 0-90/180 1/2HP (90V), 1HP (180V)
MD50P-420 (4-20mA IN/OUT) 1/4 DIN PANEL MOUNT 120/240 0-90/180 1HP (90V), 2HP (180V)
MD50E-420 (4-20mA IN/OUT) NEMA 4 SURFACE MOUNT 120/240 0-90/180 1HP (90V), 2HP (180V)
MD40P 1/8 DIN PANEL MOUNT 120/240 0-90/180 1/2HP (90V), 1HP (180V)
MD50P 1/4 DIN PANEL MOUNT 120/240 0-90/180 1HP (90V), 2HP (180V)
MD50E NEMA 4 SURFACE MOUNT 120/240 0-90/180 1HP (90V), 2HP (180V)
-51 Option Field install 'P' versions, Factory install 'E' version RS232/485 RS232/485

These closed loop devices require an encoder / speed pick-up. The Dart PU-E is an excellent choice!

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