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10. The VFD shall be relatively insensitive to waveform distortion, especially the waveform <br />distortion caused by the VFD. <br />11. A six pulse converter section consisting of a three-phase, full wave phase controlled <br />rectifier or diode bridge converter to convert incoming A.C. power to constant voltage <br />D.C. <br />12. D.C. bus capacitors and inductors necessary to filter rectification ripple. <br />13. Three-phase full wave inverter to construct an A.C. wave form, with minimum harmonic <br />content, at any frequency between 0 and 60 Hz. to control motor speed. Motor terminal <br />voltage shall be controlled in proportion to output frequency such that the voltage to <br />frequency ratio remains essentially constant. <br />14. Adjustable volts/Hz ratio. <br />15. Adjustable PWM carrier frequency. <br />16. Independent acceleration and deceleration controls, adjustable from 0 to 600 seconds. <br />17. The drive shall accommodate the opening of a disconnect between the drive output and <br />the motor, while under full load. <br />18. All input/output signals shall be wired to terminal strips for field terminations. Provide <br />an RS232 or RS485 port for remote computer monitoring. <br />19. Provide panel mounted master reset pushbutton for all safety and overload circuitry. <br />20. Elapsed motor run-time meter with six digit nonreset indicator operable through auxiliary <br />contacts from the VFD. <br />21. Provide typewritten terminal block schedules and wiring diagrams within a plastic holder <br />permanently attached to the inside door of the VFD. <br />22. Adjustable current limit to control the maximum controller output current during starting <br />and running. <br />23. Minimum and maximum speed adjustment. Minimum speed shall be factory set at 50 <br />percent of motor nameplate rated full load speed. Maximum speed shall be preset to 100 <br />percent of motor nameplate rated speed or as required by existing motor nameplate full <br />load current. The drive shall provide at least three adjustable setpoints to lock out <br />continuous operation at frequencies which may produce mechanical resonance. <br />24. The VFD shall be capable of starting into a motor rotating at any speed without tripping. <br />25. Key circuit points shall be monitored by light emitting diodes, (LEDs) to assist in <br />troubleshooting. Each shall be labeled and referenced to the instruction manual. <br />26. The VFD shall be operable with the output open circuited. <br />044572017 <br />16483-6 <br />