[PROJECT NAME] [PROJECT NUMBER]
SECTION 262923
VARIABLEFREQUENCY DRIVE MOTOR CONTROLLERS
PART 1 GENERAL
1.1SUMMARY
A.This sectionincludes general requirements for Variable Frequency Drives(VFD’s) used for the operation and speed control of electric motors designed to NEMA Type Design B standards for electrical induction motorsand permanent magnet motors.
B.This section includes the requirements for control motor systems herein referred to as VFDs. The VFD will consist of a factory integrated unit consisting of solid-state components that output a pulse-width modulated (PWM)signal suitable to control the speed of the connected motor. The VFD will consist of branch circuit protection, a control circuit, a power circuit, and an LCD display to be used as an intuitive human interface. The VFD will be connected between the power source and the motor and may include an optional fully electrical bypass where specified on drawings.
C.This sectionincludes requirements for Variable Frequency Drives (VFD’s) applied specifically into Heating, Ventilation and Air Conditioning (HVAC) applications, such as fans, pumps, compressors and others requiring speed control of induction and permanent magnet motors sized for power and load applied.
D.The Variable Frequency Drive (VFD) package shall contain all components required to meet the performance, protection, safety and certification criteria of this specification.
1.2RELATED SECTIONS
A.Section 23 00 00 – Heating, Ventilating, and Air Conditioning (HVAC).
B.Section 23 05 00 – Common Work Results for HVAC.
C.Section 26 00 00 – Electrical.
D.Section 26 05 00 – Common Work Results for Electrical.
1.3REFERENCES
A.NFPA 70 – National Electric Code (NEC).
B.UL 508A – Standard for Safety for Industrial Control Panels.
C.UL 508C –Standard for Safety for Power Conversion Equipment.
D.UL 50 / NEMA 250 – Standard for Safety for Enclosures of Electrical Equipment.
E.NEMA ICS 7-2014 Adjustable Speed Drives.
F.IEEE 519-1992 – Recommended Practice and Requirements for Harmonic Control in Electric Power Systems.
G.NEMA ICS 61800 - Adjustable Speed Electrical Power Drive Systems.
1.4SUBMITTALS
A.Product Data: For each type of VFD, provide manufacturer technical data and installation details, including but not limited to features, performance and electrical ratings, dimensions, weights, mounting arrangements, conduit entry locations,environmental and ventilation requirements.
B.Shop Drawings: Provide complete wiring and schematic diagrams, terminal designations, software descriptions, calculations, and any other details required to demonstrate that the system has been coordinated and will function properly. The shop drawings submittals shall include the following information for each size and type of VFD to be furnished:
1.Name of manufacturer.
2.Types and model numbers with options clearly specified.
3.Designation for each VFD to identify controlled equipment.
4.Rated VFD power.
5.Percent efficiency at 100 percent speed and 100 percent load.
6.Front and side views with overall dimensions and weights shown and nameplate legends.
7.Schematics including interlocks.
8.Wiring diagrams including all associated pertinent internal and external devices and terminal blocks.
9.List of diagnostic indicators.
10.List of spare drives and parts to be furnished.
11.List of spare parts to include complete set of replacement fuses.
C.Field Dimension Data: Include dimensioned plans, elevations, sections, and details, including required clearances and service space around equipment. Show tabulations of installed devices, equipment features and ratings.Show VFD layout and relationships between electrical components and adjacent structural and mechanical elements. Show support locations, type of support, and weight on each support. Indicate field measurements.
D.Design Data: Power, signal, control wiring and a description of the communication type, media and protocol for the VFD. Outline diagrams showing the overall enclosure and mounting dimensions with front and side views and weights. The outline drawings shall also include conduit entry and exit locations along with intended conduit sizes. A list of fuse sizes and overload current settings for any such devices in the bypass shall be provided.
E.Test Reports: Provide VFD factory test description with the project bid. VFDs shall be 100% tested at the factory and have a motor load connected prior to shipment.
F.Manufacturer’s Instruction: VFD dimensional layout requirements, required working clearances, and required area above and around VFDs where pipe and ducts are prohibited.
G.Field Reports: VFDs shall be commissioned in the field by the manufacturer, manufacturer’s agent, or trained technician only. Provide a start-up report to include installation overview, application description, VFD wiring description and parameter settings as programmed for the application. Comments on VFD performance as commissioned shall be also noted in the field report.
H.Operation and Maintenance: For all VFDs, associated installed devices, interconnected devices, and related system components, provide the following:
1.Operation & Maintenance (O&M) manual clearly describing standard procedures for safely operating each piece of equipment and operation of the components together as a system. Include emergency shutdown procedures and any special instructions for maintaining the warranty.
2.Routine maintenance requirements for VFDs and all related components.
3.Instructions for testing and adjusting over-current protective devices.
4.Start-up software which can be installed and operate on a common PC with currently available version Windows platform. Provide help instructions for its connection, operation, and use.This PC software shall allow offline or live VFD configuration and monitoring.
5.Copy of eachcompleted VFD Start-up report.
6.Included optional equipment descriptions and drawings.
7.Toll free phone number for manufacturers direct technical support line.
1.5QUALITY ASSURANCE
A.The VFD manufacturershall be reputable and able to provide specialized support and consultation related to strategies, field devices, and related components common to the HVAC industry.
B.Manufacturer must have a minimum of 10 years of documented experience specializing in variable frequency drives VFDs for HVAC.
C.Manufacturer must maintaina nationwide coverage network of authorized product distributors, includingat least one distributor local to the project site capable of providing training, parts and support for emergency, maintenance, repairs and technical assistance in field.
D.Source Limitations: VFDs of a single type shall be from a single manufacturer.
E.All products, their installation, and the resulting system must meet all applicable Local and National codes.
F.The manufacturer shall adhere to ISO 9001 International Quality Control Standards.
G.Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.
H.Product Selection for Restricted Space: Drawings indicate maximum dimensions for VFDs, minimum clearances between VFDs, and adjacent surfaces and other items. Comply with indicated dimensions and clearances.
I.All VFDs shall be listed and classified by Underwriters Laboratories in accordance with standards listed in Article 1.03 of this specification. VFDs and options shall be UL listed and cUL listed as a complete assembly. VFDs and options shall be CE labeled as a component.
J.All VFDs shall be 100% factory tested to ensure proper performance.
K.All VFDs are insulation tested (i.e., Hi-pot) at their input and output terminal connections.
L.All VFDs are load tested at 100% of their nominal operating current at assorted speed references.
M.All VFD panels will be functionally tested to ensure proper operation. The VFD shall be factory pre-wired, assembled and tested as a complete package.
N.All inspection and testing procedures shall be developed and controlled under the guidelines of the Supplier’s quality system and must be registered to ISO 9001 and regularly reviewed and audited by a third party registrar.
1.6DELIVERY, STORAGE AND HANDLING
A.Packing and Shipping: Provide factory-shipping cartons for each piece of equipment and control device. Maintain cartons through shipping, storage, and handling as required to prevent equipment damage.
B.Storage and Protection: Equipment delivered and placed in storage shall be stored indoors with protection from the weather, humidity and temperature variations, dirt and dust, or other contaminants. Storagetemperatures shall be between -40°F to 158°F.
1.7SITE CONDITIONS
A.The VFD shall be designed to operate in an ambient temperature ranging from 14°F to 104°F.
B.The vibration allowable is 1 mm at 5 until 15,8Hz / 1G at 15,8 until 150 Hz.These conditions apply before, during and after installation.
C.Storagetemperatures shall be between -40°F to 158°F.
D.The VFD shall be suitable for operation at altitudes up to 3,280 feet without de-rating.
E.VFDs shall be located in well ventilated areas, free from excess humidity, dust and dirt and away from hazardous materials. Indoor locations shall be protected to prevent moisture from entering enclosure.
1.8WARRANTY
A.The VFD components, parts and assemblies, and workmanship shall be warranted by the manufacturer against defects for a period of 36 months from date of shipment.
B.During the contract warranty period, upon notice by the owner, any defects in the work provided under this section due to faulty materials, methods of installation or workmanship shall be promptly (within 48 hours after receipt of notice) repaired or replaced by this contractor at no expense to the owner.
1.9MAINTENANCE
A.Maintenance Service: The manufacturer shall provide a phone support service for immediate remote service assistance which shall be available a minimum of 8 hours per day during weekdays exclusive of major US holidays.
PART 2 PRODUCTS
2.1MANUFACTURERS
A.Approved manufacturers are allowed on condition of meeting the specified conditions herein.Manufacturer must meet or exceed all requirements and conditions stated herein.
B.The basis-of-design for this specificationis Honeywell SmartVFD HVAC™.
C.All drives shall be Honeywell SmartVFD HVAC™. No substitutionswill be allowed without prior written approval. Substitution requests must be submitted in writing at least 2 weeks prior to bid date and will not be considered without a complete list of deviations from this specification.
2.2VARIABLE FREQUENCY DRIVESFOR HVAC
A.The variable frequency drive (VFD) shall be designed specifically for use in Heating, Ventilation, and Air Conditioning (HVAC) applications in which speed control of the motor can be applied. Applications in HVAC includePumps, Fans, and Compressors.
B.The VFD integral controller shall provide extensive configuration flexibilities, including 2 stand-alone PID control loops, and Pump and Fan Cascade control. The VFD shall include built-in radio frequency interference filters (RFI) in accordance with NEMA ICS 61800 as noted herein.
C.The VFD shall include external fault reset capability. All the necessary logic to accept an external fault reset from either an input contact or a communications channel shall beincluded.
D.The VFD efficiency shall be 98.5% or better at full speed and full load. Displacement power factor shall be no less than 0.98 at all speeds and loads.
E.Each VFD shall provide a removable operator control LCD display with keypad on the front of the VFD which can optionally be remotely mounted. Provide ability to save and write VFD configurations to keypads and exchange keypads with other VFDs of same model type.
F.Each VFD shall provide the following operator control keypad features:
1.START push button
2.STOP push button.
3.LOCAL/REM push button.
4.BACK/RESET push button.
5.ARROWS UP/DOWN/RIGHT/LEFTpush buttons.
6.Indication of RUN, READY, and FAULT Status and Operations.
7.Live monitoring of up to 9 selectable values simulatenously.
8.Language Options in Portuguese, Spanish, French and English.
9.Real Time Clock with automatic daylight savings time capability.
G.The VFD shall include built-in dual 5% DC choke to minimize harmonic (THD) from the device.
H.The VFD shall be RoHS Compliant. The RoHS directive aims to restrict certain dangerous substances commonly used in electronic and electronic equipment. No electrolytic capacitors. No lead in circuit boards.
I.The VFD shall provide a minimum of3 built-in communications options for control and monitoring from the Facility Management and Control System. These communications shall include BACnet and MODbus protocols in both serial and IP form.
J.The VFD with Bypass combination product family shall be a factory assembled and tested unit. Bypass shall be integral with VFD and assembled in the USA under ISO 9001 International Quality Control Standards. VFD with Bypass shall display UL, CE and cUL markings.
K.Compliances: The Variable Frequency Drive shall comply with:
1.EN 61800-3, EMC
2.EN 61000-3-12, Harmonics
3.EN 61800-5-1, safety
4.UL 508 C, safety
5.CE, UL, cUL markings
L.Technical Requirements:
1.Mains Connection:
1.Input Voltage Uin: 208-240Vac; 380-480Vac (+10%, -15%)
2.Input Frequency: 47-66 Hz
2.Motor Connection:
1.Output Voltage: 0-Uin
2.Continuous output current: IL: Ambient temperature max. +104°F, overload 1.1 x IL (1 min./10min.)
3.Starting current: Is for 2 sec. every 20 sec.
4.Output frequency: 0-320 Hz (standard)
3.Control Characteristics:
1.Control Method: Frequency Control U/f
2.Switching Frequency: 1.5-10kHz
3.Automatic switching frequency compensation for overheating.
4.Frequency Reference: Analog Input Resolution 0.1% (10-bit) ±1%, Panel Reference Resolution 0.01 Hz
5.Field Weakening Point: 8-320 Hz
6.Acceleration Time: 0.1-3000 sec.
7.Deceleration Time: 0.1-3000 sec.
4.Ambient Conditions:
1.Relative humidity: 0-95% RH, non-condensing, non-corrosive.
2.Air quality:
1)Chemical vapors: IEC60721-3-3, unit in operation,Class 3C2.
2)Mechanical particles: IEC 60721-3-3, unit in operation, Class 3S2.
3.Altitude: 100% load capacity (no derating) up to 3,280ft (1,000m)1% derating for each 328 ft (100 m) above 3,280 ft (1,000 m)
4.Vibration EN61800-5-1 /EN60068-2-6: 5…150 Hz, Displacement amplitude 1 mm (peak) at 5…15.8 Hz, Max acceleration amplitude 1 G at 15.8…150 Hz
5.Mechanical shock: UPS Drop Test (for applicable weights), Storage and shipping: Max 15 G, 11 ms (in package)
6.Enclosure class: NEMA 1 standard, NEMA 12or NEMA 3R optional as specified on the drawings.
5.Electro Magnetic Compatibility (ECM):
1.RFI Immunity: EN61800-3 (2004), 1st and 2nd environment (industrial and public electrical networks)
2.RFI Emissions: EN61800-3 (2004), Category C2 EMC filtering
6.Safety:
1.EN 61800-5-1 (2007), CE, UL508C, UL, cUL
7.Control Connections:
1.Analog Inputs: (2) inputs as standard for mA or V. Resolution 0.1%, accuracy ±1%, short-circuit protected.
2.Digital Inputs: (6) inputs as standard with positive or negative logic: 0-5 V = “0”, 15-30 V = “1”, Ri = min. 5 kΩ
3.Motor Thermistor Input: RTrip = 4.7 kΩ (PTC), measuring voltage 3.5V
4.Aux. DC-voltage Input: 24 Vdc, ±10%; can be used for power backup of the control unit.
5.Analog Output: (1) output as standard selection for mA or V. Resolution 0.1%, Accuracy ±2%, short-circuit protected.
6.Digital Outputs: (2) programmable relay outputs (NO/NC) as standard. Max. switching load: 24Vdc / 8 A, 250Vac / 8A or 125 Vdc / 0.4 A. Min. switching load: 5 V / 10 mA.
7.24V Aux. Voltage Output: (1) output: +24 Vdc, ±10%, max. load 250mA, short-circuit protected.
8.10V ref. Voltage Output: +10 Vdc, +3%, max. load 10 mA
8.Protections:
1.Over voltage.
2.Under voltage.
3.Ground fault.
4.Mains phase supervision.
5.Motor phase supervision.
6.Over current protection.
7.Unit over temperature
8.Motor overload.
9.Motor stall: Fan /Pump blocked.
10.Motor underload: Pump dry /Belt broken detection.
11.Short-circuit protection of +24V and +10V ref. voltages.
12.Input signal underrange: broken wire detection.
13.Pump soft fill timeout.
M.High-Resolution Graphic Display:
1.The VFD shall provide an integrated keypad and LCD display for user interface.
2.The menu driven display shall provide the minimum, maximum, and actual values for all parameters, uploading and downloading of parameters, and multiple help functions, with operator’s manual built-in.
3.The display shall provide a Local /Remote Button on the keypad for built-in Hand-Off-Auto control.
4.Multi-monitor Screen (English): The display shall collect and present nine monitored values from actual values of selected parameters and signals, as well as statuses and measurements. The following values shall be monitored as initial set-up:
1.Frequency Reference (Hz)
2.Output Frequency (Hz)
3.Motor Speed (RPM)
4.Motor Current (A)
5.Motor Torque (%)
6.Motor Voltage (V)
7.DC-Link Voltage (V)
8.Unit Temperature (°C)
9.Motor Temperature (%)
5.Diagnostic Screen: The display Diagnostic Screen shall provide a description for every fault, as well as the actual values and references stored at the instant of the fault event. The display shall blink the name of the fault when a fault appears, with 40 latest faults stored in history.
6.System Performance Monitor: The display shall collect and present operational and energy data values:
1.Cumulative amount of energy consumed.
2.Control unit operating time.
3.Motor running time.
4.Amount of time the unit has been powered.
5.Start command count.
N.The VFD shall provide integral standardized communications interfaces to allow reading monitored values and reading/writing configuration parameters.BACnet and MODbus shall be included and available using Ethernet or RS485 communications. LonWorks shall be included if specified on the drawings.No additional software shall be required in the VFD to employ these standardized protocols.
O.The VFD shall provide integral software wizards to support easy setup of HVAC applications..
1.Basic Startup Wizard shall present list of baseline parameters.
2.PID Controller shall allow:
1.Two different feedback signals (minimum and maximum control).
2.Two setpoint sources for the PID control (selectable with digital input).
3.External PID controller (control of an external final control element).
4.Single input control (analog signal rising edge starts VFD).
5.Run interlock input (Damper interlock) VFD will not start before input is activated.
6.Direct or reverse acting regulation.
7.Feed forward control (faster response to process changes).
3.Pump and Fan Cascade Control:
1.The integral controller functionality shall provide control up to 4 motors.
2.The integral controller shall maintain setpoint by regulating one motor and disconnecting the other motors to /from the mains, by means of digital output relay controlled contactors.
3.The integral controller shall define order /priority in which the motors are started to equalize motor runtime.
4.Time-based Control:
1.The integral controller functionality with the real time clock and calendar shall provide for three time channels programmed to perform different functions (start /stop and Preset frequencies) based on time.
5.Fire Mode Wizard
P.Operational Functionality:
1.Motor Switch Ride-though:The VFD shall provide trip-free operation when an output switch interrupts power between the VFD and the motor.