Wattstopper
®
Fixture Integrated Dimming Photosensor
Installation Instructions • Instructions d’Installation • Instrucciones de Instalación
No: 24625 – 09/16 rev. 1
Catalog Number • Numéro de Catalogue • Número de Catálogo: FD-301
Country of Origin: Made in China • Pays d’origine: Fabriqué en Chine • País de origen: Hecho en China
DESCRIPTION AND OPERATION
The FD-301 is a fixture-integrated dimming photosensor. It provides a continuous dimming signal to a 0-10VDC dimming ballast, based
on daylight level. It is a low voltage device used in conjunction with a Wattstopper FS-PP power pack. The FD-301 is a “closed loop”
system; it considers both daylight and electric light when determining dimming levels. It uses a sliding setpoint control algorithm to
maintain the desired illuminance levels for separate night and day target setpoints. The FD-301 slowly raises or lowers the electric lights
to avoid sudden changes that can annoy occupants. After the photosensor-equipped fixture is installed, final setup adjustments are
made using the LSR-301-S remote control setup tool. After commissioning, the FD-301 automatically adjusts the electric lights to meet
target illuminance levels.
Additional Control Options
Manual or Automatic
ON/OFF
lighting control can be provided by a switch or fixture integrated
occupancy sensor connected to the FS-PP (see Figures 5 and 6 for wiring). Occupant
dimming control is provided by the optional LSR-301-P. This remote control allows the
occupant to temporarily adjust light levels.
Photosensor Placement
The FD-301 photosensor works with 0-10VDC dimming ballasts to control lights in areas that
receive enough daylight so that the electric lights can be dimmed.
• Avoid installing photosensor-equipped fixtures where the light from one controlled fixture
spills over into the view of the next photosensor.
• Avoid locating photosensor-equipped fixtures close to specular surfaces such as highly
polished floors or tables, or highly reflective surfaces such as tops of cabinets, and others.
LAMP BURN-IN
Follow the lamp manufacturer’s recommendation on lamp burn-in for new lamps prior dimming the lamps with the FD-301. If the lamp
manufacturer’s guidelines are not followed, premature lamp failure may occur. After the fixture is installed and power is supplied to the
FD-301, it will drive the lamps at full output until the Night adjustment has been completed using the LSR-301-S remote control. See the
Photosensor Commissioning
section for more information.
PHOTOSENSOR COMMISSIONING
The FD-301 is commissioned under two conditions, Night and Day. Either adjustment may be completed first. The red LED under the
FD-301’s lens flashes continuously until the Night and Day adjustments are both completed, then it can begin automatic dimming.
Conditions for Setup
Set up the FD-301 after all furnishings are installed. Placement of furnishings affects the way light reflects from various surfaces.
• Furniture, floor, and wall coverings must be installed and clean.
• All light fixtures must be installed and fully operational.
• Window coverings must be installed, clean, and operable.
• Remove unnecessary objects such as tools and installation materials from the view of the FD-301.
• Do not block primary sources of electric light or daylight from reaching the FD-301’s view.
SPECIFICATIONS
Power Supply ................... 24VDC from Wattstopper FS-PP
Current Consumption .................................. 30mA@24VDC
Ballasts .................................... 0-10VDC dimmable ballasts
Wire Length, photosensor to ballast and FS-PP ..... 6’ (182cm)
Maximum Ballasts Controlled ...........................................50
Max Sink current .........................................................50mA
Min Signal to ballast ................................................ 0.2VDC
Max Signal to ballast .................................................. 0VDC
Window
Light Fixture
Typical Daylit Zone, about 12' (3.6m)
FD-301
Field of view
70º
Figure 1: Placement
