Note: One (1) elevator in each bank shall be connected
in a common bank, provide a common emergency feeder
from the Elevator ATS to allow each elevator to be
operated individually during an emergency. By interlocking
the ATS with the elevator group controller, programming
shall be made by the elevator supplier to set up a controlled
return to the terminal floor and then limit the number of
elevators in that bank that can be run.
Elevator machines shall be powered from circuit breakers
with a shunt trip and with padlocking capability, located
in the elevator machine rooms. Electrical design standards
in Elevator Standard ANSI/ASME A17.1 shall be followed.
general use on all projects by virtue of their contribution
to the energy efficiency of the project. They also generate
harmonics which are injected into the secondary power
distribution system and need to be minimized through
the use of filters tuned to the peak harmonic generated
by the drive.
VFDs shall utilize a minimum 12-pulse, pulse width
modulation (PWM), design because of their low harmonic
output, excellent power factor and high efficiencies. VFDs
shall be specified with passive harmonic filters. VFDs
shall also be specified with isolation transformers where
required.
Specify thermal sensors that interlock with the VFD control
circuit for additional solid state motor protection for
motors running at low speeds and subject to overheating.
This is in addition to the standard over-current protection
required.
Ronald Reagan Building, Washington, D.C.
187
ELECTRICAL
ENGINEERING
6.7
Secondary Branch Power Distribution
Revised March 2005 PBS-P100
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