substitution request - Alliance Construction Solutions

2.05 VARIABLE FREQUENCY DRIVES:
A. Variable frequency drive (VFD) and associated fixed-speed bypass panel shall be in a
single enclosure and shall be suitable for control of a standard NEMA MG-1 parts 30 & 31
Design B three-phase induction motor.
B. Variable Frequency Motor Control:
1. The control shall be PWM type and shall produce a three-phase output capable of
providing efficient operation of standard NEMA MG-1 parts 30 & 31 Design B
induction motors.
2. The control shall consist of a power section made up of a fixed AC-to- DC converter,
a fused DC bus, storage network, and an inverter, using IGBT’s in the
power switching section. The drive shall incorporate AC line reactors as required
to provide for a power factor of .95 or better at design load. The power section
shall be isolated from the control section between the driver output of the printed
control circuit card and the power switching devices.
3. Drives shall have a logic control section which is microprocessor based, using a
32-bit processor and LSI for minimum part count and maximum reliability.
4. Each VFD shall be provided with a two-line backlit liquid crystal display with a
minimum of 32 characters. During normal operation, the display shall simultaneously
show the VFD mode of operation, VFD status, VFD speed, and VFD load
(amps). If a fault occurs, the reason shall be displayed as an English message
such as “OUTPUT OVERLOAD” rather than fault codes. A digital keypad shall be
provided to facilitate entry of all adjustments. All parameters shall be selected by
clear English messages on the LCD screen, and shall be entered in Engineering
units. VFD’s utilizing LED displays or displays with fewer than 32 characters will
not be considered equal to the type specified.
5. The drive shall use the latest available technology for motor noise and line
harmonic reduction.
C. Specification:
1. NEMA 1 cabinet enclosure with a steel gasketed hinged door. Manual control
and programming devices shall be door-mounted or accessible without opening
door. NEMA 3R for outdoor from 32°F to 104°F. (Provisions should be made if
above or below temperature range.)
2. Input power: 460V, three-phase, 60 Hz or as noted on drawings.
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
a. Nominal input voltage +/- 10%
b. +/- 3% input frequency stability
3. Voltage harmonic and current distortion requirements:
a. All VFD’s shall meet the requirements as outlined in IEEE-519-1992 for
individual and total harmonic voltage distortion. Individual or simultaneous
operation of the VFD’s shall not add more than 3% total harmonic
voltage distortion to the normal bus. The point of common coupling shall
be at the MCC bus or panelboard bus to which the VFD is connected.
The short circuit current at point of common coupling under utility
operation is 42,000 AIC.
b. If harmonic filters are required to meet the above requirements, the VFD
manufacturer must provide the filters and is responsible for the design
and manufacturing of the filters. A full harmonic analysis must be
23 0513 - 7 MECHANICAL/ELECTRICAL REQ.
FOR MECHANICAL EQUIPMENT