For use with Vmax-VFD vacuum systems equipped with the Allen-Bradley PowerFlex 700 series VFD

Each Vmax system is tested and checked at the factory prior to shipment to ensure trouble free operation.  In the unlikely event you encounter a problem, we recommend that you consult with your local distributor for parts/service. Remember, when calling for service, parts, or system information, always have the pump or system model number and serial number ready. Visit our web site for a list of local distributors.

Some systems are equipped with a VFD along with a remote keypad (also called a Human Interface Module or HIM) which is usually door mounted on the control panel.  Upon power up of the system, the VFD will go through an initial self-check and the remote HIM keypad will display the Main Menu.

The High Temperature Alarm light will be on.  You must push the Alarm Condition Reset button before you can place the system in the desired mode of operation.

Press the ESC button on the HIM keypad to switch to a three line User Display screen.  The top of the LCD should read "Stopped".  The word "Auto" should also be present in the upper right corner of the display to indicate Auto mode.  A second press of the ESC button would return to the Main Menu.

The first user line shows VFD output frequency in Hertz (Hz).  The second line shows Run Time in hours.  The third line displays the actual operating vacuum level as Torr feedback (Torr FdBk). 

The VFD will maintain the vacuum level at the set point by increasing or decreasing the motor speed. At 60 Hz, the motor operates at full nameplate RPM.  At lower vacuum demand, the VFD frequency (Hz) will decrease.  This produces lower RPM as well as lower amps and horsepower.  This can result in energy savings and lower operating costs. 

The vacuum set point for the system is set by using the HIM keypad.  If the up or down arrow button is pressed while viewing the user display, the top user line will temporarily change to "%".  As the arrow button is held down, the % value will change.  The % value correspoonds to the Vacuum Set Point. 

The attached VFD chart provides a conversion table from % Value to Vacuum Set Point.  For example, a % value of 33% corresponds to 256 Torr or 19.84" HgV.

All system wiring is performed at the factory.  Check area classification to ensure all electrical enclosures comply to code.  Required customer wiring is minimal but should be done by a qualified electrician in compliance with OSHA, National Electric Code and any other applicable local electrical code concerning switches, fused disconnects, etc.  Dekker Vacuum Technologies includes a wiring diagram in the control panel for use by the installer.  Dekker recommends that a main disconnect switch be fitted between the vacuum system and the incoming power.

For more information about Dekker Vacuum Technologies, visit our web site at www.dekkervacuum.com