SECTION 16483

VARIABLE FREQUENCY CONTROLLERS

PART	GENERAL

SECTION INCLUDES

Variable frequency controller.

RELATED SECTIONS

Section 03300 - Cast-in-Place Concrete: Housekeeping pads.

Section 16195 - Electrical Identification: Engraved nameplates.

REFERENCES

NFPA 70 - National Electrical Code.

NEMA ICS 3.1 - Safety Standards for Construction and Guide for Selection, Installation and Operation of Adjustable Speed Drive Systems.

NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum).

SUBMITTALS

Submit under provisions of Section [01300.] [_______.]

Shop Drawings: Include front and side views of enclosures with overall dimensions and weights shown; conduit entrance locations and requirements; and nameplate legends.

Product Data: Provide catalog sheets showing voltage, controller size, ratings and size of switching and overcurrent protective devices, short circuit ratings, dimensions, and enclosure details.

Test Reports: Indicate field test and inspection procedures and test results.

Manufacturer's Installation Instructions: Indicate application conditions and limitations of use stipulated by Product testing agency specified under Regulatory Requirements. Include instructions for storage, handling, protection, examination, preparation, installation, and starting of Product.

Manufacturer's Field Reports: Submit under provisions of Section [01400.] [_______.]

Manufacturer's Field Reports: Indicate start-up inspection findings.

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section [01700.] [_______.]

Operation Data: Include instructions for starting and operating controllers, and describe operating limits that may result in hazardous or unsafe conditions.

Maintenance Data: Include routine preventive maintenance schedule.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum [three] [_________] years [documented] experience[, and with service facilities within [100] [____] miles of Project].

REGULATORY REQUIREMENTS

Conform to requirements of NFPA 70.

Furnish products listed and classified by [Underwriters Laboratories, Inc.] [testing firm acceptable to authority having jurisdiction] as suitable for purpose specified and indicated.

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section [01600.] [________.]

Accept controllers on site in original packing. Inspect for damage.

Store in a clean, dry space. Maintain factory wrapping or provide an additional heavy canvas or heavy plastic cover to protect units from dirt, water, construction debris, and traffic.

Handle in accordance with manufacturer's written instructions. Lift only with lugs provided for the purpose. Handle carefully to avoid damage to components, enclosure, and finish.

FIELD MEASUREMENTS

Verify that field measurements are as [indicated [on shop drawings].] [instructed by manufacturer.]

MAINTENANCE SERVICE

Furnish service and maintenance of controller for [one year] [_______] from Date of Substantial Completion.

EXTRA MATERIALS

Furnish under provisions of Section [01700.] [_______.]

Provide [two] [________] of each air filter.

Provide [three] [________] of each fuse size and type.

PART	PRODUCTS

MANUFACTURERS

[_____________________________________] Model [_________].

[_____________________________________] Model [_________].

[_____________________________________] Model [_________].

Substitutions: Under provisions of Section [01600.] [________.]

DESCRIPTION

Provide enclosed variable frequency controllers suitable for operating the indicated loads. Conform to requirements of NEMA ICS 3.1.

RATINGS

Rated Input Voltage: [208] [240] [480] [____] volts, three phase, 60 Hertz.

Motor Nameplate Voltage: [200] [230] [460] [____] volts, three phase, 60 Hertz.

Displacement Power Factor: Between 1.0 and 0.95, lagging, over entire range of operating speed and load.

Operating Ambient: 0 degrees C to 40 degrees C.

Minimum Efficiency at Full Load: [______] percent.

DESIGN

Employ microprocessor based inverter logic isolated from power circuits.

Employ pulse width modulated inverter system.

Employ switching power supply operating off DC link.

Design for ability to operate controller with motor disconnected from output.

Design to attempt five automatic restarts following fault condition before locking out and requiring manual restart.

PRODUCT OPTIONS AND FEATURES

Display: Provide integral digital display to indicate output voltage, output frequency, and output current.

Status Indicators: Separate indicators for overcurrent, overvoltage, ground fault, overtemperature, and input power ON.

Volts Per Hertz Adjustment: Plus or minus [10] [____] percent.

Current Limit Adjustment: [60 - 110] [________] percent of rated.

Acceleration Rate Adjustment: [0.5 - 30] [_________] seconds.

Deceleration Rate Adjustment: [1 - 30] [_________] seconds.

Provide HAND-OFF-AUTOMATIC selector switch and manual speed control.

Input Signal: [4 - 20 mA DC.] [3 - 15 psi pneumatic.] [0-10 mV DC.] [________.]

Safety Interlocks: Provide terminals for remote contact to inhibit starting under both manual and automatic mode.

Control Interlocks: Provide terminals for remote contact to allow starting in automatic mode.

Manual Bypass: Provide contactor, motor running overload protection, and short circuit protection for full voltage, non-reversing operation of the motor. Include isolation switch to allow maintenance of inverter during bypass operation.

Disconnecting Means: Include integral [fused disconnect switch] [circuit breaker] on the line side of each controller.

FABRICATION

Wiring Terminations: Match conductor materials and sizes indicated.

Enclosure: NEMA 250, Type 1.

Finish: Manufacturer's standard enamel.

SOURCE QUALITY CONTROL

Inspect and production-test each product specified in this section.

PART	EXECUTION

EXAMINATION

Verify conditions under provisions of Section [01039] [________].

Verify that surface is suitable for controller installation.

Do not install controller until building environment can be maintained within the service conditions required by the manufacturer.

PREPARATION

Provide concrete housekeeping pad under the provisions of Section [03300.] [________.]

INSTALLATION

Install controller where indicated, in accordance with manufacturer's written instructions and NEMA ICS 3.1.

Tighten accessible connections and mechanical fasteners after placing controller.

Install fuses in fusible switches.

Select and install overload heater elements in motor controllers to match installed motor characteristics.

Provide engraved plastic nameplates under the provisions of Section 16195.

Provide neatly typed label inside each motor controller door identifying motor served, nameplate horsepower, full load amperes, code letter, service factor, and voltage/phase rating.

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400.] [________.]

Inspect completed installation for physical damage, proper alignment, anchorage, and grounding.

MANUFACTURER'S FIELD SERVICES

Prepare and start systems under provisions of Section [01400.] [________.]

ADJUSTING

Adjust work under provisions of Section [01700.] [________.]

Make final adjustments to installed drive to assure proper operation of fan system. Obtain performance requirements from installer of driven loads.

CLEANING

Touch up scratched or marred surfaces to match original finish.

DEMONSTRATION

Provide systems demonstration under provisions of Section [01650.] [________.]

Demonstrate operation of controllers in automatic and manual modes.

END OF SECTION