2013-06-19Variable Frequency Drives
This Master Specification Section contains:
.1This Cover Sheet
.2Data Sheet - General
VARIABLE FREQUENCY DRIVE SPECIFICATION
Master Specification Section Text for variable speed drives is attached. The Data Sheets contained herein include specific requirements to be followed when specifying variable frequency drives. Contact Alberta Infrastructure, Technical Services Branch Edmonton, for clarification of these requirements.
INTENT
Engineering responsibility with respect to variable frequency drives (VFDs) is known to be a contentious issue within the mechanical and electrical engineering disciplines. This Data Sheet is intended to establish Alberta Infrastructure policy in this area. Do not deviate from the directives contained in this Data Sheet without express permission from Alberta Infrastructure to do so.
ENGINEERING RESPONSIBILITIES
Engineering responsibilities for VFDs shall be as specified herein, regardless of VFD configuration (packaged or nonpackaged), regardless of location where VFDs are specified, and regardless of which trade supplies and installs VFDs.
The decision of whether or not to incorporate VFDs for control of mechanical equipment into the building design shall rest with the mechanical consultant, subject however to Alberta Infrastructure approval. Unless otherwise directed by Alberta Infrastructure, this decision shall be based solely on optimum cost/benefit to Alberta Infrastructure.
Product selection, specification preparation, shop drawing review, site inspection, and commissioning of VFDs shall be a joint responsibility of the mechanical and electrical consultants. The two disciplines shall properly coordinate their activities as required to fulfill this joint responsibility.
TRADE JURISDICTION
VFDs which are part of a packaged mechanical system are supplied and installed by the mechanical trade; nonpackaged VFDs are supplied and installed by the electrical trade.
SPECIFICATION LOCATION
Specify VFDs which are part of a packaged mechanical system within the Division23 Section which specifies the packaged mechanical system. If there is more than one packaged mechanical system incorporating VFDs, specify the VFDs for all such packaged mechanical systems in Section238105Variable Frequency Drives in Packaged Systems.
Specify VFDs which are not part of a packaged mechanical system in this Section262923Variable Frequency Drives.
For VFDs to be considered part of a packaged mechanical system:
.1VFDs and equipment controlled by VFDs shall be a complete, integral system supplied directly by a single manufacturer, and
.2the packaged mechanical system shall require only one main power connection to be made by the electrical subcontractor.
System components purchased separately from more than one manufacturer and integrated into a "package" by a distributor or by the mechanical contractor, shall not be considered a packaged mechanical system.
MECHANICAL
Packaged equipment, so specified under the mechanical scopes, shall mean pre-wired equipment supplied in a completely electrically operable state after one final connection of power wiring, and remote control connections and remote connections if specified.
END OF DATA SHEETS
2013-06-19 BMS VersionPlan No.:Section 26 29 23
Centre Code:VARIABLE FREQUENCY DRIVES
Page 1
1.General
1.1 RELATED REQUIREMENTS
Spec Note:Delete the following three clauses and include the last two clauses in part 3 for small projects or drive only projects.
.1EMCS Start-up and TestingSection 23 08 95.
.2Electrical Start-up and Testing –
General Requirements:Section 26 08 10.
.3Electrical Equipment and Systems
Demonstration and Instruction:Section 26 08 40.
1.2CERTIFICATION AND STANDARDS
.1Products covered by this section to comply to the applicable standards of the following:
.1CSAC22.2 No.14-95 Industrial Control Equipment
C22.2 No.100-95 Motors and Generators
C22.2 No.0.16-M92 Measurement of Harmonic Currents
.2EEMACStandards for Enclosures, Contact Ratings and Design B Motors
.5IEEE519 M1992 Recommended Practices and Requirements for Harmonic Control in Electric Power Systems
Emerald Book for Transients
.6NEMAMG1 Part 31 1993 Rev 1 Motors and Generators
Spec Note: Add the following where extended warranty is required.
1.3WARRANTY
.1Provide a warranty covering all parts and labour for [one] [two] years.
Spec Note: Review and coordinate requirements with Section 01 33 23 – Shop Drawings, Product Data and Samples.
1.4SHOP DRAWINGS
.1Provide [six] copies of shop drawings and operating literature.
.2Shop drawings shall include:
.1Catalogue information and technical data
.2Outline dimensions, shipping dimensions, weight, foundation requirements and mounting details.
.3Wiring, connection, and control diagrams and schematics
.3Product data for:
.1input current harmonics,
.2short circuit rating,
.3environmental limitations
.4control features.
Spec Note: Review and coordinate requirements with Section 01 78 23 – Operation and Maintenance Data and Manuals.
1.5OPERATING AND MAINTENANCE INFORMATION
.1Upon interim acceptance, provide three sets of operating and maintenance manuals including:
.1Operating instructions
.2As built shop drawings
.3Recommended spare parts list
.4Manufacturer and supplier data: including addresses and phone numbers for technical support and spare parts.
1.6SUPPLIER QUALIFICATIONS
.1System supplier or manufacturer's authorized agent shall have technical service and maintenance capabilities, using experienced personnel, available on site within 24 hours of callout.
2.Products
2.1PRODUCT MANUFACTURERS
.1Acceptable Manufacturers:
.1Siemens
.2Telemecanique
.3Toshiba
.4Magnetek
.5Allen Bradley
.6Mitsubishi
2.2VARIABLE FREQUENCY DRIVES
.1General
.1Drive Type: Adjustable Frequency Drive, Pulse Width Modulated (PWM)
.2Output Devices: Insulated Gate Bipolar Transistors (IGBT) in the inverter section of the drive
.3All contactors, relays and switches EEMAC rated..
.4All drives of a single manufacture
.2Motor and Drive Compatibility:
.1Suitable for use with standard or high efficiency EEMAC Design B motors having a service factor of 1.15 or
specific motors meeting NEMA MG1 Part 31, 1993 Rev.1.
.2Suitable for either constant or variable torque loads.
.3Operable without connected load for setup and testing.
.4Able to accept opening of a remote motor disconnect, while running, without damage to the drive.
.3Enclosure: EEMAC 1 [wall] [floor] mounted
.4Voltage:
.1Input:[208] [480] [600] volts nominal, ±15%;
3 phase; 60 Hz ±3Hz.
.2Output:[208] [480] [600] volts, 3 to 66 Hz, 3 phase,
with volts per hertz compensation.
.3Transformers:Do not use transformers on either the input or output for voltage compliance.
.5Rating:
.1 Power:Horsepower or Kilowatt ratings as specified in the Equipment Schedule.
.2Service Factor: 1.1 for rated output current, continuous duty
.3Thermal: 130% of rated output current for one minute.
.4Efficiency: 97% minimum at maximum load and speed.
.5Power Factor:0.95 minimum line side at all speeds.
Spec Note:The THD criteria are for CURRENT. The THD numbers shown below are intended to require most manufacturers to add input filtration for drives over 50 HP. For individual drives and where total load of all drives is under 50 HP this criteria may be increased to 15%THD.
.6Harmonic Distortion:Total Harmonic Distortion (THD) for Input current generally not to exceed the requirements of IEEE 519 M1992 where the point of common coupling is considered to be where the drive connects to the system and specifically not to exceed:
10% for drives 100 HP and larger
12% for drives between 50 and 100 HP
15% for drives under 50 HP.
Spec Note:Short circuit withstand must be coordinated with available system fault current and upstream protective devices.
.7Short Circuit:Drive capable of withstanding short circuit of [10,000] [25,000][50,000] [100,000] amps, asymmetric at line side terminals.
.6Drive Protection:Provide the following protection:
.1Transients:Input transient protection for IEEE Class B ringwave.
.2Voltage:Line over and under voltage, phase loss and phase unbalance.
.3Short Circuit:Line to line and line to ground.
Drive to shut down without damaging any power circuit devices on either of these faults. Do not use fuses or isolation transformers to provide this protection.
.4Overcurrent:electronic, instantaneous
.5Current Limit:adjustable for 70 to 110% rated current.
.6Internal controller over-temperature.
.7Ambient Conditions:The drive shall operate satisfactorily under the following ambient conditions
.1Temperature:0 to 40°C.
.2Humidity:5 to 90% non-condensing.
.3Altitude:up to 1000m without drive derating
.8Controls:Provide the following controls and adjustments:
.1Minimum speed:0 - 70%, adjustable.
.2Maximum speed:50 - 150%, adjustable.
.3Acceleration /deceleration ramp:1 to 300 seconds
(0 to 100% speed), adjustable, linear or S curve.
.4Speed and load meter:0 to 100% with selector switch, door mounted
.5Run and Stop push buttons, door mounted
.6Hand-off-auto selector switch, door mounted
.7Keypad speed setting, door mounted.
2.2VARIABLE FREQUENCY DRIVE
.9Motor Protection:Provide the following motor protection features:
.1Overload:Provide thermal or solid state overload protection, adjustable from 80% to 115% of full load rating. For drives feeding multiple motors, provide individual motor overloads.
.2Over temperature:Provide positive temperature coefficient (PTC) thermister protection for motors identified in the Equipment Schedule.
.3Stall protection:electronic, to trip the drive off under motor stall conditions.
.4Automatic restart:after an inverter fault trip the drive shall attempt to restart automatically three times and lock out after the third attempt if a restart has not occurred.
.5Rotating motor restart: The drive shall restart a rotating motor without first stopping it for short duration power outages, shut downs or fault trips by resynchronizing with the motor at it’s rotating speed and re-accelerating it to setpoint speed.
.6Output Filter:For drives of 100 HP and larger, provide an RLC output filter network to limit dv/dt or provide data showing that a filter is not required for the specific motor being driven.
.10Control Interface:Provide the following control interfaces:
.1[4-20 mA] [0-10 VDC] [0-5 VDC] signal follower switchable to inverse characteristics
.2Dry contact closure for run command
.3Dry contact (N.O.) output to indicate:
.1Inverter Fault
.2Inverter Running (motor turning)
.44-20 mA isolated output, proportional to speed
.54-20 mA isolated output, proportional to load
Spec Note:Include the following where drives are controlled by EnergyManagement Control Systems.
[.6signal follower to interface with the EnergyManagement Control System (EMCS)]
Spec Note:Include the following where drives are controlled by means of an independent process controller.
[.6Provide integral PID controller to directly accept sensors for [temperature] [pressure] [flow].]
.11Status:Provide on line status information.
Display each of the following status points by a separate pilot light or LCD display on the controller door:
.1Start Command Present
.2External Trip (interlocks open)
.3Lockout (fault shutdown after 3 restart attempts)
.4Ready (power on - no faults present)
.5Power On
.6Low reference (missing or zero speed reference)
.7Motor Running Direction
.8Inverter in current limit
.12Fault Diagnostics:Provide diagnostics which memorize and display the last ten fault occurrences even after the drive restarts. Indicate each of the following faults by a separate pilot light or LCD display on the controller door:
.1Stop called for or start error
.2External trip (interlock opened)
.3Controller over temperature
.4Emergency stop
.5High DC Bus
.6Output transistor fault
.7Low DC Bus
.8Current Overload
.13Indicators:Provide additional LED's or other diagnostics to allow signal tracing of logic and base driver circuit boards.
.14Interlocks:Provide external interlock for firestat, freezestat, smoke detector or other devices as indicated in the Equipment Schedule. Common interlock to cause motor to coast to stop.
2.3SYSTEM OPERATION:
.1Motor to start when the selector switch is in the "auto" position and the run command is received from the control system. Speed to be controlled by the control signal.
.2Motor to start when the door mounted run pushbutton is depressed when the selector switch is in the "manual" position. Speed to be controlled by the door mounted manual speed control.
.3Motor to automatically restart after a power outage when the power returns, if the run command is maintained. After short duration outages, motor to be restarted while rotating.
.4Motor to restart automatically, with up to 3 attempts, in the event of an inverter trip. Drive to lock out after 3 unsuccessful attempts.
2.4OVERCURRENT PROTECTION
Spec Note:Include one of the following clauses. Edit to require unfused disconnects where upstream overcurrent protection is provided remote from drive location. Use the electronic overcurrent protection clause only where additional protection is provided by upstream distribution system components and drive models specified can provide this feature.
.1Provide incoming fused line disconnect switch or circuit breaker with the following:
.1Door interlock
.2 Provisions for padlocking operating mechanism
.3Overcurrent curves for fuses or circuit breakers coordinated with the drive’s output protection. Fuses not to blow or breakers trip under output faults such as overcurrent, short circuit and ground fault
.1Provide electronic overcurrent protection with trip curves coordinated with the overcurrent devices upstream in the facility distribution system.
3.Execution
3.1MOTORS
.1Ensure that the motors fed from the drives are compatible with the drives, including load rating, voltages and thermistor protection.
3.2INSTALLATION
.1Set and secure the drives in place on channel bases, rigid, plumb and square to the building floors and walls.
.2For drives 100 HP and larger, locate drive so that conductors from drive to motor are less than 10m long.
.3Provide two hold down bolts for each 1m linear width.
.4Protect drives from dust and damage during construction.
.5After connections are made, vacuum clean interior, hand clean exterior and touch up any damaged paint.
Spec Note:Delete the following clause 3.2.6 and add clauses 3.3 and 3,4 when Sections 26 08 10and 26 08 40are not provided.
.6Comply with requirements of Sections 26 08 10 and 26 08 40.
3.3START-UP AND TESTING
.1For drives 100 HP and larger, provide the services of a manufacturer trained technician, on the site, to review the installation and assist in the set up, starting and testing of the drives. Allow a minimum of four hours on site per drive.
.2Set up the drive prior to energizing. Set up to include initial settings for all adjustable parameters.
.3Function test the drive prior to interim acceptance. Test shall include:
.1functional testing of all safety devices
.2start, run up, signal tracking, stop and hot restart
.3load test using the connected load, run through available load and speed range
.4test of control sequences
.5snapshot of harmonic content for input and output current at 100% and 50% load
3.4DEMONSTRATION AND INSTRUCTION
.1For drives 100 HP and larger, provide operator training, on site, using manufacturer trained personnel.
.2Training to include the following topics:
.1Drive theory
.2Drive configuration and models installed
.4Set up for each drive type
.5Maintenance
.6Troubleshooting
3.5EQUIPMENT SCHEDULE
Drive Number / Quantity / Motor Horsepower / POC / Interlocks / Breaker or Disconnect2013-06-19 BMS Version