Dialight D1RW-L13-008 Vigilant L866/L885 LED Based Dual Red / White Catenary - Manual (Page 9)

Document No.
9100-127-1426-99 Rev D
Release Date: 10/26/2010
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Dialight Corporation 1501 Route 34 South Farmingdale NJ 07727
Tel: 732.919.3119 Fax: 732.751.5778 Web: www.dialight.com
Page 9 of 25
Section 5: Ferrites
Ferrites act to increase the inductance of a conductor and can be effective at
reducing or eliminating RF or lightning immunity problems.
Some Ferrites are already included in this model, both inside the Flash Head and
in the Power Supply as part of lightning protection and RF immunity on the Flash
Head cabling. However, since every installation is different and extreme or
unusual conditions may be encountered. It may occasionally be prudent or
necessary to add more to control or power lines.
Different Ferrite materials have different effectiveness depending of the
frequency to be attenuated. They should be chosen for maximum attenuation at
the frequency of concern. As a general rule, the more material in the ferrite the
higher will be the attenuation.
For maximum lightning immunity and EMC performance, choose ferrite materials
with good broad band attenuation, such as Steward 28B1020-100.
Better attenuation will be obtained if the cable can be put through the center
more than once. Inductance is proportional to the square of number of turns so
twice through is theoretically 4 times the inductance of 1 turn.
Multiple ferrites (including different types in combination) can be used on a single
cable.
Section 6: Flash Rate & Steady Burn
Both Red Beacon and White Strobe default to 60 flashes per minute.
The flash rate may be adjusted between 20-60 fpm by means of the Sync input.