VFD - CABINET , ENCLOSURES & CONTROLS

2026-11-03

DESCRIPTION A . Provide all variable frequency drives ( VFD ) as indicated on the Single Line Diagram sketch . Owner shall coordinate variable frequency drive Manufacturer selection with all equipment Manufacturers . Ensure AIC of new VFD enclosures are equal to the rating of existing Motor Control Center . B . Variable frequency drives which are shown to be located in a standalone enclosure are not required to be of the same Manufacturer as any variable frequency drives installed within the motor control center . C . Acceptable Manufacturers are ASEA Brown - Boveri ( ABB ), Toshiba , Square D , or equal . 1 . 2 REQUIREMENTS SPECIFIED ELSEWHERE A . Additional Requirements are specified elsewhere including : 1 . Section 16160 – Cabinets and Enclosures 2 . Section 16900 - Controls 1 . 3 QUALITY ASSURANCE A . The equipment specified herein is based upon the first Manufacturer named after the phrase " Acceptable Manufacturer ' s ". Equipment types , device ratings , dimensions , etc . correspond to the nomenclature dictated by that Manufacturer . Equipment of other acceptable Manufacturers shall be equivalent in every way to that of the equipment specified . B . Suppliers deemed equivalent shall be responsible to support and supply equivalent equipment which shall meet the intended design . C . All equipment shall be tested at the factory . Unless specified elsewhere , standard factory inspection and operational tests will be acceptable . 1 . 4 SUBMITTALS TO THE ENGINEER A . Shop Drawings are required for all items provided under this section . Submittals shall be provided in accordance with this section . 1 . Prior to fabrication a . Components … b . Assembly … c . Diagrams … d . System analysis documentation and verification for application 2 . Prior to startup a . VFD Parameter Setup Checklist 3 . After startup a . VFD parameter setup verification and record version of VFD Parameter Setup PART 2 - PRODUCTS 2 . 1 MATERIALS A . Variable Frequency Drives 1 . The drive shall be capable of varying the speed of a standard or inverter duty rated NEMA Design B induction motor from a virtual standstill to the standard speed of the motor . The unit shall transform input power into a variable voltage , adjustable frequency three phase output of suitable capacity and waveform . 2 . Input voltage shall be as indicated on the Drawings and / or as specified in the equipment specification sections . Frequency shall be 60 Hz . 3 . Output shall be three ( 3 ) phase voltage as indicated on the Drawings and / or as specified in the equipment specification sections . 4 . The drive shall be a PWM ( Pulse Width Modulated ) transistorized inverter . 5 . The drive Manufacturer shall have not less than five years of experience in the manufacture of drives in the United States . 6 . The drives shall be rated for constant or variable torque applications ( 460V - 1 HP to 150 HP ), depending on the individual driven load requirements . For constant torque applications , the output transistors shall be low - gain , fully rated . Derated high - gain transistors are not acceptable . 7 . Power Line Considerations

Connecticut

2026-03-27