ELECTRICAL VARIABLE FREQUENCY DRIVES (VFD)
- Description: All items described within this section shall comply with the provisions of Section 15001: General M&E Requirements. Variable Frequency Drives (VFD) shall be of solid-state, static voltage source type, using minimum 32-bit microprocessor or the latest available, digital sine wave approximation Pulse Width Modulation (PWM) type suitable for the applications, controlling mainly pumps with variable torque characteristics. The VFD shall confirm to CE compliance and UL approved to Standard 508C. The VFD and associated control equipment shall be housed within a cubicle forming part of the relevant Factory Built Assembly (FBA) such as a MCC. A standalone control panel, however, may be provided depending on the design and application that requires special ventilation arrangements and due to space constrains within the MCC cubicles. If so, the detailed technical proposal shall be submitted for ADSSC review and approval. The VFD shall be of proven design to provide high pump efficiency, high availability, minimum maintenance, substantial energy reduction, and longer bearing and seal life at reduced speeds. The VFD shall control pump speed by employing advanced torque control techniques and auto tuning that measure and set all constant and critical parameters of the motor automatically. The VFD cubicle shall be considered as a starter with the addition of a VFD with display unit and a keypad, and therefore shall comply with the requirements of Section 16030: Motor Control Centre and Section 16070: Starters. The Contractor shall provide a properly matched pump-motor-cabledrive system for the specific duty operating in conjunction with VFD considering load–torque characteristics, kW rating, efficiency, thermal capacity, power factor improvement, EMI mitigation, etc. This shall include the use of braided and armoured field cable, if required by the VFD manufacturer. Braided cable shall be used with VFDs, in any event, if the cable length exceeds 100m or the cable passes near a source of large electromagnetic interference (such as a large motor or HV cables). If required, the VFD shall incorporate output reactors to negate the effects of cable capacitance and ensure correct operation of the VFD.
- Standards: Local
- Location: Abu Zabi
- Categories: Fire Protection, Architecture, Structure, Mechanical, Electrical, Plumbing, Generic
- Sub Categories: Architecture
- Posted: February 3rd, 2022, 10:07 am
- GENERAL REQUIREMENTS
- CONFIGURATION
- CONTROL AND PROTECTION
- OPERATING CHARACTERSTICS
- SOURCE TESTS
- FIELD TESTS
