VLT
®
6000 HVAC
25MG.60.B1.02 - VLT is a registered Danfoss trademark
Introduction to
HVAC
1.06 Quality Assurance
A. The frequency converters shall be manufactured in
accordance with ISO 9001: 1994 Quality Systems.
B. To ensure quality and minimize failures at the
jobsite, every frequency converter shall be tested
by the manufacturer. The frequency converter shall
operate a dynamometer at full load and the load
and speed shall be cycled during the test.
C. All optional features shall be functionally tested at
the factory for proper operation.
1.07 Submittals
A. Submit manufacturer's performance data
including:
1) dimensional drawings
2) power circuit diagrams
3) installation and maintenance manuals
4) warranty description
5) frequency converter's full load ampere rating
6) UL certification agency file numbers
7) catalog information
B. The specification lists the minimum frequency
converter performance requirements for this
project. Each supplier shall list any exceptions to
the specification. If no departures from the
specification are identified, the supplier shall be
bound by the specification.
C. The frequency converter manufacturer shall carry
out a harmonics study to determine compliance
with the standards listed under
1.03 References at the Point of Common Coupling
prior to commencement of contract. Data
necessary to perform the study will be made
available to the manufacturer.
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■ Part 2 Products
2.01 Manufacturers
Danfoss VLT® 6000 HVAC
Graham VLT® 6000 Series
2.02 General
A. Furnish complete frequency converters as
specified herein for the fans and pumps
designated on the drawing schedules to be
variable speed. All standard and optional features
shall be included within the frequency converter
enclosure, unless otherwise specified.
B. All drive adjustments and programming shall be
capable of being stored in non-volatile memory
(EEPROM).
C. Operating frequency shall be limited to zero to 120
Hz
D. Active current limit function to provide nominal 110
percent torque for 1 minute.
2.03 Mechanical
A. Frequency converters shall be housed in a metal IP
54 enclosure in accordance with IEC 529.
2.04 Electrical
A. The frequency converter shall convert incoming
fixed frequency three-phase AC power into a
variable frequency and voltage for controlling the
speed of three phase AC motors. The motor
current shall closely approximate a sine wave.
Motor voltage shall be varied with frequency to
maintain desired motor magnetization current
suitable for centrifugal pump and fan control.
B. An advanced sine wave approximation and voltage
vector control shall be used to allow operation at
rated motor shaft output at nominal speed with no
derating. This voltage vector control shall minimize
harmonics to the motor to increase motor
efficiency and life.
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