Legrand FS-355E Occupancy and Light Level Sensor for Indoor/Outdoor Use Line Voltage • Fixture Mount Installation Instruction

Legrand FS-355E Occupancy and Light Level Sensor for Indoor/Outdoor Use Line Voltage • Fixture Mount Installation Instruction


Occupancy and Light Level Sensor for Indoor/Outdoor Use Line Voltage • Fixture Mount SPECIFICATIONS

Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220-240VAC, 50Hz Load Requirements @230VAC, 50Hz . . . . . . . . . . . . . . . . . . . . . . .0-1200W ballast Adjustments Time Delay . . . . . . . . . . . . . . . . . . .36 seconds — 36 minutes Factory Setting . . . . . . . . . . . . . . . . . . . . . . . 18 minutes Light Level, Hold OFF . . minimum <10fc, maximum >120fc Factory Setting . . .maximum (never hold or turn OFF) Wiring Terminals . . . . . . . . . . . . . . . . . . . . . . Hot, neutral, load Use Copper Conductor Only . . . . . . . . . . . . . 18AWG-14AWG Torque Rating . . . . . . . . . . . . . . . 4.428 inch-pound. (0.5Nm) Coverage FS-L2W Lens @ 8’ height . . . . . . . . . . . . . . . . . .48’ diameter FS-L3W Lens @ 20’ height . . . . . . . . . . . . . . . . .40’ diameter FS-L4W Lens @ 40’ height . . . . . . . . . . . . . . . . .60’ diameter Operating Temperature. . . . . . . -40°F (-40°C) to 131°F (55°C) Dimensions Throat . . . . . . . . . . . . . . . . . . . . . . . 1.12” diameter (28.6mm) Tightening Ring outer . . . . . . . . . . 1.46” diameter (37.2mm) Lens Pipe Length . . . . . . . . . . . . . . . . . . . . . . 0.38” (9.6mm) Body . . . 1.38” x 2.35” x 0.88” (35mm x 59.5mm x 22.7mm) OPEN DEVICE for installation in the Listed Enclosure per Installation Instructions.


The FS-355E occupancy sensor turns lighting ON and OFF based on occupancy and ambient light levels. The light level feature can be used to keep lights from turning ON and turn them OFF if the ambient light level is sufficient. This slim, low-profile sensor is designed for installation inside the bottom of a light fixture body. The PIR lens connects to the FS-355E through a 1 1/ 8 ” (29mm) diameter hole in the bottom of the fixture.

The sensors use passive infrared (PIR) sensing technology that reacts to changes in infrared energy (moving body heat) within the coverage area. Once the space is vacant and the time delay elapses (adjustable from 36 seconds to 36 minutes), lights will turn OFF. Sensors must directly “see” motion of an occupant to detect them, so careful consideration must be given to sensor placement. Avoid placing the sensor where shelving or other obstructions may block the sensor’s line of sight.

The FS-355E operates between 220-240VAC. It is designed for installation in a light fixture.

Important, there is an initial warm-up period:

It may take up to a minute before the lights turn ON due to a sensor warm-up period required during initial power-up. This occurs during installation or after a lengthy power failure only.




1. Determine an appropriate mounting location inside the light fixture. Allow a minimum distance of 1.3” (33mm) from the center of the sensor collar to the edge of the fixture.

2. Use a 1 1/ 8 ” (29mm) bit to drill a hole through the sheet metal in the bottom of the fixture.

3. From the inside of the fixture, insert the FS-355E lens pipe through the hole in the bottom of the fixture. Install the sensor face down, parallel to the mounting surface. Hand tighten the Lens securely against the outside of the fixture. If necessary, use the Tightening Ring, with or without the metal washer (provided), as a spacer on either side of the fixture wall.

4. Connect load and supply wires as shown in Figure 2.

5. Restore power from the circuit breaker.

Ballast FS-355E Inside Fixture Wall FS-355E Inside Fixture Wall FS-355E Outside Fixture Wall Outside Fixture Wall Tightening Ring Lens Assembly

Fig 1: FS-355E mounting in light fixture

Note: The Outside Fixture Wall thickness should be between 0.032” and 0.10” (0.82mm and 2.54mm) for optimal sensor mounting and security.

Outdoor Use at the Sensor Collar part only when (Sensor Collar part exposed and) installed at the specifi c location per Installation Instructions with a Listed Outdoor Enclosure.


Fig 2: FS-355E wiring

Line/Hot Neutral Load Ballast Load #14 — #18 AWG Strip Gage 1/2" 12.7mm

Cu Wire Only


Density and range of the coverage pattern is determined by the type of lens and mounting height. The FS-355E is compatible with multi-cell, multi-tier Fresnel lenses. See the FS-LxW Lens Module Coverage Guide for a description of the available coverage patterns.


The Light Level feature holds OFF and turns OFF lights when the space is occupied and adequate ambient light exists. When the light level drops below the set level it will turn the lights ON when the space is occupied. The factory setting is for maximum, meaning that even bright ambient light will not cause the sensor to hold the lights OFF if it detects occupancy in the controlled area. *




Factory Settings The Light Level and Time Delay adjustment trimpots are located under the lens assembly. The trimpots are accessed easily after the sensor is mounted in the fixture. Gently unscrew the lens assembly. Do not remove the thumbscrew collar; it holds the sensor in place on the fixture. Identify each trimpot. Light Level Maximum (light level should not affect load operation*) Time Delay 50% (18 minutes) Set the light level when the controlled light would normally be turned OFF due to the presence of sufficient daylight or other electric light. [If this feature is not needed, leave the light level at maximum (fully clockwise)].

* At the maximum setting, the light level entering the photosensor must exceed 120fc, which only happens in rare applications or when the lens is removed.

Test Occupancy Sensor

1. Set Light Level to maximum (fully clockwise, factory setting) and Time Delay to minimum (fully counterclockwise). Put the lens assembly back onto the sensor.

2. Move out of the sensor’s view. Lights turn OFF after 36 seconds.

3. Move into the controlled area. The red LED in the sensor lens should illuminate and the lights should turn ON.

Test and Adjust Light Level Sensor and Time Delay

1. Remove the lens assembly and adjust the light level and the time delay to minimum. Put the lens assembly back onto the sensor. Leave the controlled area and let the sensor time out so lights are OFF. 2 Enter the controlled area and lights should remain OFF. 3. Make sure your body does not cast a shadow on the sensor. Turn the light level trimpot clockwise in small increments. After each adjustment, put the lens back on the sensor then move about the controlled area. Wait 5-10 seconds to see if the lights turn ON. 4. Continue this procedure until the lights turn ON. At this setting the lights will not turn ON with 24 min.

occupancy if the light level is above the current level.

18 min.

12 min.

30 min.

5. Set the time delay to the desired setting. The time delay can be set from 36 seconds (fully counterclockwise) to 36 minutes (fully clockwise). 6 min.

36 sec.

36 min.

TROUBLESHOOTING Lights will not turn ON:

• LED does not flash: - Check all wire connections and verify the ground wire is tightly secured.

• LED does flash: - Check all wire connections and verify the load wire is tightly secured.

- Check light level setting. Cover the sensor lens to simulate darkness in the room. If the lights come ON, the light level needs to be adjusted. If set for minimum, more than 10fc of ambient light will cause the lights to be held OFF. See Sensor Adjustment section for instructions.

• If lights still do not turn ON, call 800.879.8585 for technical support.

Lights will not turn OFF:

The time delay can be set from a minimum of 36 seconds (fully counter-clockwise) to a maximum of 36 minutes (fully clockwise). Ensure that the time delay is set to the desired delay and that there is no movement within the sensor’s view for that time period.

• To quickly test the unit for proper operation, turn the time delay to minimum and move out of the sensor’s view. Lights should turn OFF after 36 seconds.

• If lights still do not turn OFF, call 800.879.8585 for technical support.

Operation during Power-Up

During the sensor warm-up period, which can last up to a minute after initial power-up (or after a lengthy power outage), the load can be either ON or OFF, depending on the status of the relay before the sensor was powered down. After warm-up, the sensor will open or close the relay to correspond to the occupancy status of the room.


Catalog # Description

FS-355E Fixture mount, line voltage occupancy sensor FS-L2W FS-L3W 360° lens, maximum coverage 48’ diameter at 8’ height 360° lens, maximum coverage 40’ diameter at 20’ height FS-L4W 360° lens, maximum coverage 60’ diameter at 40’ height Sensor is White.


Watt Stopper/Legrand warranties its products to be free of defects in materials and workmanship for a period of five (5) years. There are no obligations or liabilities on the part of Watt Stopper/Legrand for consequential damages arising out of, or in connection with, the use or performance of this product or other indirect damages with respect to loss of property, revenue or profit, or cost of removal, installation or reinstallation.

2800 De La Cruz Boulevard, Santa Clara, CA 95050 Technical Support: 800.879.8585


11945r3 12/2009

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