Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT16480 – MOTOR CONTROLLERSIssue Date:September 28, 2012Page #:5 of 12manufacturers, with similar features and performance described below,and meeting the specific requirements of this project are acceptable.3. The VFD shall be solid state, with a Pulse Width Modulated (PWM)output waveform (VVI, sixstep, and current source drives are notacceptable). The VFD package as specified herein shall be enclosed in aNEMA 12 enclosure or as described on the project drawings, completelyassembled and tested by the manufacturer. The VFD shall employ a fullwave rectifier (to prevent input line notching), DC or line side Reactor,capacitors, and Insulated Gate Bipolar Transistor (IGBT’s) as the outputswitching device (SCR’s, GTO’s and Darlington transistors are notacceptable). The drive efficiency shall be 97 percent or better at full speedand full load. Fundamental power factor shall be 0.98 at all speeds andloads.4. All printed circuit boards shall be completely tested and burnedin beforebeing assembled into the completed VFD. The VFD shall then besubjected to a preliminary functional test, eight hour burnin, andcomputerized final test. The burnin shall be at 104 degrees F (40 degreesC) at full rated load.5. VFD’s shall be UL listed. The VFD’s shall be designed to meet therequirements of the following standards: IEC 8012, IEC 8014, IEC 2554.6. See drawing schedule for VFD sizes and voltages.7. All VFD’s shall have integral maintenance bypass. See drawing schedulesfor controller type.8. All VFD’s shall have the following features:a. All VFD’s shall have the same customer interface, includingdigital display, keypad and customer connections; regardless ofhorsepower rating. The keypad is to be used for local control(start/stop, forward/reverse, and speed adjust), for setting allparameters, and for stepping through the displays and menus.b. The VFD shall give the user the option of either (1) displaying afault, (2) running at a programmable preset speed, (3) hold theVFD speed based on the last reference received, or (4) cause aWarning to be issued, if the input reference (420mA or 210V) islost; as selected by the user. The VFD shall provide aMOTOR CONTROLLERS 16480 5