SUMMARY This section includes complete stand-alone Variable Frequency Drives (VFD’s), as well as factory enclosed, combination, and bypass packages up to 480V, for speed control of 3-phase NEMA Design B induction motors and optimized for HVAC applications. General purpose VFD’s are not acceptable. VFD Variable Frequency Drive, also known as and applies to the following: – VSD Variable Speed Drive – AFD Adjustable Frequency Drive – ASD Adjustable Speed Drive – VSC Variable Speed Controller – AC Drive Inverter DEFINITIONS BAS Building automation system – CPT Control power transformer – EMI Electromagnetic interference – HMI Human machine interface (Display and operation buttons) – LED Light-emitting diode – NC Normally closed – NO Normally open – PID Proportional, Integral, Derivative (Control loop with feedback mechanism) – RFI Radio-frequency interference – PLC Programmable logic controller – REFERENCE STANDARDS Underwriters Laboratories (UL) UL 61800-5-2 UL508 UL508A UL508C International Electrotechnical Commission (IEC) EN 61800-5-1 Low Voltage Directive / Adjustable speed electrical power drive – systems EN 61800-3 EMC Directive / Adjustable speed electrical power drive systems – EN 60204-1 Low Voltage Directive / Electrical Equipment of Machines – EN 50178 Low Voltage Directive / Electrical Equipment for use in Power – Installations EN 61800-1/2/4 Low Voltage Directive / Rating specifications for Power Drive – Systems
SUMMARY This section includes complete stand-alone Variable Frequency Drives (VFD’s), as well as factory enclosed, combination, and bypass packages up to 480V, for speed control of 3-phase NEMA Design B induction motors and optimized for HVAC applications. General purpose VFD’s are not acceptable. VFD – Variable Frequency Drive, also known as and applies to the following: VSD – Variable Speed Drive AFD – Adjustable Frequency Drive ASD – Adjustable Speed Drive VSC – Variable Speed Controller AC Drive Inverter DEFINITIONS BAS – Building automation system CPT – Control power transformer EMI – Electromagnetic interference HMI – Human machine interface (Display and operation buttons) LED – Light-emitting diode NC – Normally closed NO – Normally open PID – Proportional, Integral, Derivative (Control loop with feedback mechanism) RFI – Radio-frequency interference PLC – Programmable logic controller REFERENCE STANDARDS Underwriters Laboratories (UL) UL 61800-5-2 UL508 UL508A UL508C International Electrotechnical Commission (IEC) EN 61800-5-1 – Low Voltage Directive / Adjustable speed electrical power drive systems EN 61800-3 – EMC Directive / Adjustable speed electrical power drive systems EN 60204-1 – Low Voltage Directive / Electrical Equipment of Machines EN 50178 – Low Voltage Directive / Electrical Equipment for use in Power Installations EN 61800-1/2/4 – Low Voltage Directive / Rating specifications for Power Drive Systems