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Transcript
Luke AFB Master 48 CSI DIVISIONS 6/09 SECTION 262923 16484 VARIABLE FREQUENCY DRIVES PART 1 GENERAL 1.01 SUMMARY A. Section Includes: Variable Frequency Drives for speed control and soft starting of AC Motors. 1.02 SUBMITTALS A. Product Data: Submit manufacturer’s data for variable frequency controllers indicating Manufacturers specifications. B. Shop Drawings: Submit shop drawings showing equipment dimensions and clearances. Show spatial relationship to adjacent equipment and structures. 1.03 REGULATORY REQUIREMENTS A. U.L. (Underwriters Laboratories) B. F.C.C. Part 15, Class A C. IEEE 519 - 3% THD for any electrically noise sensitive applications. 1.04 START-UP A. Include in the price of the equipment, as separate line item, a factory coordinated start-up service for each VFD. PART 2 PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS A. Asea Brown Boveri B. Danfoss-Graham C. Emerson 262923 16484 Luke AFB Master 48 CSI DIVISIONS 2.02 6/09 ADJUSTABLE FREQUENCY CONTROLLERS A. The adjustable frequency controller shall convert 480v, +10% Voltage +5% Frequency, three phase, 60 Hertz utility power to adjustable voltage/ frequency, three phase, AC power for step-less motor speed control with a capability of 10:1 speed range. All general options and modifications shall mount within the standard adjustable frequency controller enclosure unless otherwise specified. B. The 1 through 25HP, 480VAC, adjustable speed drive shall be a pulsewidth-modulated (PWM) design that has a carrier frequency of 12KHz or higher with output line reactor. Six-step PWM with carrier frequency below 12 KHz shall produce acoustical noise no higher than across-theline motor operation +2dB. The adjustable speed drive shall generate a sine-coded, adjustable voltage/frequency three-phase output for complete speed control of any NEMA B variable speed duty squirrel cage induction motor. The adjustable speed drive shall maintain a 110% current overload capability for 60 seconds with automatic stall prevention and voltage boost to prevent nuisance tripping during load or line side transient conditions. The adjustable speed drive shall maintain a power factor of not less than 0.95 throughout its speed range. C. Drives and motors shall be of size, capacity and quantity as shown on the drawings. D. The controller shall produce an adjustable AC voltage/frequency output. E. The controller Output current current rating speed shall be meet or exceed shall have a continuous output current rating of 100%. capability shall be 1.1 x connected motor full load for 60 seconds. Average efficiency at full load and full not less than 97%; efficiency. Minimum FLA rating must NEC Table 430-150. F. The adjustable speed drive shall be subject to the following parameters and tests: 1. All integrated circuits (TTL) and all components used for circuit board contribution shall be tested to an acceptance criteria of 0.5% AQL (Accepted Quality Level). 2. In-circuit testing of all printed circuit boards shall be conducted to insure proper mounting and correct value of all components. 3. Final printed circuit board assemblies shall be functionally tested via computerized test equipment where all tests and acceptance criteria are pre-programmed and test results are stored as detailed quality assurance data. 4. All fully assembled controls shall be combine-tested for performance and functionality at the manufacturer’s factory with fully loaded induction motor(s). The combined test data shall then be analyzed to insure adherence to quality assurance specifications. G. The variable frequency drive (VFD) manufacturer shall have a local factory-authorized service center. The staff of service engineers at these locations shall be trained and certified by the VFD manufacturer. H. The local service center shall provide as a minimum the following services: 262923 16484 Luke AFB Master 48 CSI DIVISIONS 1. 2. 3. 4. 5. 6/09 Factory coordinated start-up service. Emergency service calls for one year after start-up. Six months after start-up, provide a one-day site visit for inspection of drives and accessories. Training of customer personnel in basic troubleshooting. Training shall be on site and shall be a minimum of one day’s duration and shall be performed in addition to startup of system. I. All VFD components shall be factory-mounted and wired on a dead front, grounded, free-standing or wall-mounted NEMA 1 enclosure arranged for a top or bottom conduit entry. The free-standing enclosure shall be suitable for mounting on a wall and have inlet air filters. J. The adjustable speed drive shall have the following basic design: 1. Bypass-off-auto selector switch (door mounted). 2. Manual speed potentiometer (door mounted). 3. Adjustable linear acceleration and deceleration. 4. Minimum 10:1 (6-60 Hz) controlled speed range capability. 5. Auxiliary Form C contacts for remote indication of controller fault condition. 6. Auxiliary Form C contacts for remote run indication. 7. Pre-engineered options will be furnished in a standard NEMA 1 enclosure. 8. Drive to accept a N.C. contact to safely shut down VFD and drive on by-pass mode. K. The adjustable speed drive shall be provided with the following features: 1. Manual Contactor Bypass with Transfer Switch - The inverter manufacturer shall provide all components and circuitry necessary for a complete manual bypass package which shall include: a. A three-position switch to safety transfer the motor from the line, or from the line to the drive at zero speed. b. The circuit breaker shall be a door interlocked main power input disconnect providing positive shutdown of all input power to the drive VFD shall have a maintenance by-pass switch. Motor protection and other safety devices shall be operative in both bypass and drive modes. c. The complete package shall be mounted in the enclosure or directly below and attached to the drive. 2. Controllers are to be provided with an input line reactor rated for the amperage of the VFD in the Nema 1 enclosure on the primary side of each VFD to protect the electrical system from unwanted high frequency voltage harmonics (500 Hertz). 3. Output thermal motor overloads. 4. Door-mounted volt, amp % speed, % load, frequency meters. Provide auxiliary output terminals on Ammeter for readout and monitoring by the HVAC Control System, 0-10 VDC for monitoring volt, amps or frequency. 5. Output contactor. 6. Auxiliary contact relay with 2 N.O. and 2 N.C. contacts. See J5 & J6 above. 7. Plug-in tester card or prewired fault indication on digital motor. 8. Catch a Spinning Load: Upon energization, the VFD shall match the speed of the spinning motor, take control and provide desired speed. L. The controller shall include the following protective circuits and features: 262923 16484 Luke AFB Master 48 CSI DIVISIONS 1. 2. 3. 4. 5. 6. 7. 8. 9. 6/09 Single-phase fault or 3-phase short circuit on VFD output terminals without damage to any power component. Static instantaneous over-current and over-voltage trip. Static over-speed (over-frequency) protection. Phase sequence detector, line or fuse loss, and under-voltage protection. Power unit over-temperature protection. Motor inverse time overload protection. Current limit adjustable 50% - 100%. Current limited stall prevention during acceleration, deceleration, and run conditions. Automatic restart after momentary power loss or momentary overvoltage, under-voltage, or over-current due to acceleration rate set too fast, because other faults, such as an over-current due to a blown transistor or a short circuit on the output, could cause damage to the inverter. No restart into ground fault. M. Fault indicators shall indicate the following fault conditions and shall be displayed on the front panel of the inverter. When a fault occurs, the drive shall have built-in diagnostic functions that assist in determining the cause and source of the fault. 1. Over-current while running (OC) 2. Over-current on output (OCL) 3. Internal short circuit (OCA) 4. Overload (OL) 5. Over-voltage while deceleration (OV) 6. Over-voltage due to power surge (OV) 7. Over temperature (OT) 8. Control function error (NULL) - Not on Graham 9. Ground Fault (GF) 10. External Fault (EXT) N. DC bus discharge indicator. The drive must have a visual indication that is visible with the door either opened or closed as to whether hazardous voltage still remains on the DC bus so servicing technicians may avoid exposing themselves to dangerously high voltage. 1. Current limiting DC bus fuse. - On electrical protection. 2. Isolated operator controls. 3. Phase-to-phase short circuit protection. 4. Over temperature protection. 5. The adjustable speed drive shall have the following adjustments available. a. Accelerating - 0.1 to 280 seconds. b. Deceleration - 0.1 to 280 seconds. c. Volts/Hertz adjustments. d. Minimum frequency (5 to 100% speed) e. Maximum frequency (25 to 150% speed). f. Carrier frequency adjusted automatically. (For drives having a Carrier Frequency of 12 KHz). g. Bias and gain adjustments for 4-20mA, 0-5VDC, 0-10VDC follower. h. Calibration adjustment for remote speed indicator (provided by others) O. The adjustable speed drive shall be designed to operate within the following environmental and service conditions. 1. Ambient service temperature: 10o C to 40o C. 2. Ambient storage temperature: 20o C to 55o C. 3. Humidity: non-condensing to 90%. 262923 16484 Luke AFB Master 48 CSI DIVISIONS 4. 5. 6. 7. 6/09 Altitude to 3,300 feet. Service factor: 1.0. Input voltage: three phase, 208/240VAC-/-10% for 230VAC series. Input frequency: 50/60-Hertz +/- 3%. P. VFD Controller operation: 1. Selector Switch in the “Off” position: The VFD run circuit will be open and the system will not operate. 2. Selector Switch in the “Hand” position: The speeds of the fans will be controlled by the manual speed potentiometer. 3. Selector Switch in the “Auto” position: Operation will be from the input signal with the output speed being proportional to that signal. Drive will start and stop in response to a contact input from Building Automation System. PART 3 - EXECUTION 3.01 INSTALLATION A. Make electrical connections in accordance with Division 16 requirements of these specifications. B. Install the VFD as per the drawings, the manufacturers recommendations and the NEC. C. The control scheme shall be adapted so that when the manual bypass switch is transferred to the magnetic contactor mode, all external safety devices are also transferred to the holding coil circuit of the contactor. D. The VFD technician shall coordinate drive spread control signals to the drive PC so that 0-100% ramping is achieved under all conditions. In addition, the ramp (linear) is to be adjusted so that a permanent minimum low speed equal to 40%, (24 Hertz) is achieved regardless of control input signals. E. The mechanical contractor shall coordinate both line and load power wiring requirements and grounding requirements with the installing electrical contractor. Power and control conductors shall not be routed near the control boards, devices subject to noise or induction or the main PC board. END OF SECTION 262923 16484