AUTOMATIC DIGITAL MOTOR SPEED CONTROLLER
                                                       FOR THE CM-100 LABORATORY DISSOLVER
 

Introduction:

This new proprietary controller will allow your CM-100 laboratory dissolver to hold a constant speed during viscosity changes in your product as it is being mixed.  The standard variable voltage speed control (variac), used on the basic CM-100, performs well but cannot compensate for load changes, that is, an increase in viscosity will cause the motor RPM to drop unless the variac is manually re-set.

The new digital speed controller overcomes this problem by optically sensing the motor RPM, and then continuously comparing actual RPM to the operators desired RPM.  Any deviation causes the controller to vary voltage and current accordingly to hold constant speed.

Physical Description:

The speed controller is comprised of two components, controller box, , and motor speed sensor.  The controller box is approximately 6" x 8" x 3" in size with jacks to accommodate motor power, and speed sensor, .  The controller has a 3 digit LCD display that is selected to either set desired motor RPM or to monitor motor RPM in the tachometer mode.  A fifteen amp power line fuse is installed on the front panel.  The controller connects to any standard 110 volt VAC power outlet.

The motor speed sensor that mounts directly on the motor is optically based and has a long service life.

Operation and Controls:

The controller box has three operator controls: Power On/Off, Motor on/off,  and Tachometer/Speed Set knob.

The Motor On/Off switch controls motor power only.  This feature allows the motor to be stopped without the RPM setting being lost and having to be reset upon motor power up.

The Speed Increase/Decrease knob is operated by viewing the LCD display and depressing the knob while turning, until the LCD display counts up or down to the desired RPM.
 
 

When the speed adjust know is depressed, the set speed shows on the LCD display. When the knob is in normal position, actual motor RPM is displayed.

The LCD display digits are .46" in height and are mounted behind a red filter.  The three digits are calibrated to x100 RPM scale, that is, a display of 010 would indicate 1000 RPM and a display of 100 would indicate 10,000 RPM.

Performance:

Motor RPM can be selected by 100 RPM increments to a resolution of 100 RPM as indicated by the LED display.  Although the RPM range selection is 0 to 19,800 RPM, actual motor performance is approximately 400 RPM minimum to 16,000 RPM (no load) maximum.

This product was designed and developed by the D.H. Melton Company, Inc., exclusively for the CM-100 laboratory dissolver.  Other applications may be feasible.  Please contact factory.
 

Also Available:

Fully programmable Option with software to interface with any IBM compatible personal computer.

This Option includes an additional circuit card and IBM PC floppy disc which allows you to pre-program speeds and duration of the mix cycle.  Any combination of speeds and times at speed can be selected for up to 10 hours run time.  Simply connect your computer to the CM-100A control box, and enter the mixing parameters from the menu driven software package.

An analog ammeter is available on the controller to view motor load.

Please inquire for prices.

 Click here for Rotor-Stator and Media Mill attachment