Page 21 - North American Clean Energy September October 2015

Programmable incremental rotary sensors
allow for an “adopted” proper placement POSITAL has launched a new line of incremental rotary encoders for the motion control and industrial
of a metal lashing, actually is the same as automation markets. hese devices are programmable, which means that performance characteristics such

creating a hole on the rooing paper where as resolution (number of pulses per turn) and incremental pulse direction (A before B or B before A) can be
moisture will ind its way in.
modiied by simply changing irmware parameters. he characteristics of the output driver can similarly
he Center for Environmental Innova- be set to either Push-Pull (HTL) or RS422 (TTL). he new incremental encoders are based on magnetic
tion in Rooing doesn’t recommend water measurement technology and are compact, rugged, and highly resistant to shock and vibration loadings.

shedding lashings on the roof where there Resolution can be set anywhere in the range of 1 to 16,384 pulses per turn. hey are also available with high
is potential ice damming such as eaves,
performance seals that make them suitable for use in extreme environmental conditions.
or overhangs, and all around the PV ar- POSITAL | www.posital.com

ray. It is recommended to use waterproof
lashings in areas where ice damming may
occur.
he other concern from installing metal

lashing between rooing shingles is the WITH OUR COMPONENTS IN YOUR
efect on the warranty of the rooing mate-
rial itself. he separation of the shingles
can be treated as a failure to seal the roof
SOLAR RACK, THE SKY’S THE LIMIT.
(blow-ofs), which will normally drasti-
cally reduce the warranty from the rooing
manufacturer; for instance, the warranty
on a general aniline and ilm (GAF) roof-

ing product was reduced from 50-years
to 15-years roof warranty for the failure
to seal. he rooing manufacturers will
become more involved as far as recommen-

dations for the installation of PV systems
on top of their rooing products based on Z-Purlin
future codes yet to be adopted.
he application of butyl tape lashing

guarantees 100% waterprooing on low-
and steep-slope asphalt rooing applica-
tions while still fully complying with code
requirements. It is fastened with 5mm

stainless screws and doesn’t require a pilot
hole. By code, the area for the attachment
to the rafter is wider when compared to
the 5/16” (8mm) usual lag bolt (National

Design Speciications (NDS) 2015). his al- C-Channel
C-Post
lows the installer to easily meet code with-
out the risk of splitting a rafter. According Images not to scale.

to NDS 2015, when the attachment on the
rafter is parallel to the grain, the minimal,
clear distance to attach a bolt or screw to
secure the PV attachment from the edge of

the rafter is 1.5 X D (D=shaft diameter) =
7.5mm (5mm screw) versus 11.91mm for a Absolute Reliability
5/16” (8mm) lag bolt. his means with the HYNES INDUSTRIES provides the strongest and
5mm fastener, the installer gets a wider most reliable Roll Formed components for your • On-hand inventory of over 37,000,000 pounds of
high volume racking needs:
area to fasten in order to meet the NDS prime quality, American-made steel
code. Installation time savings is another • Adjustable Z-Purlin and C-Channel tooling • Unsurpassed design and engineering talent
beneit with this system. he array instal- • In-line programmable punching of holes,
and experience
lation (Photo 2) would normally take 2 • Best-in-class order response and 99% on-time slots and other features to help reduce
delivery performance
hours with a rail-based system. Once the system costs
installer got to understand the process, the • ISO certified quality system and 100%
time for similar array assemblies dropped product traceability
Customized to your design, our components
to 40 minutes. (Image 2)
• 90 years of steel industry experience
will keep your solar racks standing for years
to come.

Milton Nogueira is a former board member
of the Northern California Solar Energy
Association and holds a C-46 California
Visit Hynes-Solar.com for 5 ways to add Absolute Reliability to your solar rack.
contractor’s license. Milton earned his bach-
elor of science in Mechanical Engineering
from the University of Santa Catarina in
Joinville, Brazil. He has been an advocate

of solar energy for nearly three decades and HynesIndustries.com
has extensive experience in photovoltaic sys- [email protected]
tem design and sales. He joined Roof Tech in AMERICAN
800.321.9257
their irst U.S. operation and is their senior S O L A R ENERGY SOCIETY
3805 Henricks Rd.
Youngstown, Ohio 44515
business development manager.

Roof Tech, Inc. | www.roof-tech.us

21
North American Clean Energy