LEGRAND Wattstopper UT-305-1, Wattstopper UT-305-3, Wattstopper UT-305-2 User Manual

Wattstopper

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Ultrasonic Low Voltage Occupancy Sensor with Manual On Feature (v3)
Détecteur de présence à ultrasons basse tension avec marche en mode manuel (v3)

No: 24254 – 10/16 rev. 1

Sensor de ocupación ultrasónico de bajo voltaje con función de encendido manual (v3)

Installation Instructions • Instructions d’Installation • Instrucciones de Instalación

Catalog Numbers • Les Numéros de Catalogue • Números de Catálogo: UT-305-1, UT-305-2, UT-305-3

Country of Origin: Made in China • Pays d’origine: Fabriqué en Chine • País de origen: Hecho en China

SPECIFICATIONS

Voltage ................................18-28VDC/VAC, half wave rectified AC

Current Consumption ...............................................................25mA

Power Supply ...........................................Wattstopper Power Packs

Operating Temperature .............................32° to 131°F (0° to 55°C)

Time Delay Adjustment ............................30 seconds to 30 minutes

Walk-Through Mode ..........3 minutes if no activity after 30 sec.

Test Mode .................................... 5 sec. upon DIP switch reset

DESCRIPTION AND OPERATION

The Wattstopper UT-305 sensors turn lighting systems on and off
based on occupancy.

The UT-305 can be configured to turn lighting on, and hold it on as
long as it detects cccupancy. After no movement is detected for a user
specified time (5 to 30 minutes) the lights are switched off. A “walk­through” mode can turn lights off after only 3 minutes, if no activity is
detected after 30 seconds of an occupancy detection.

The UT-305 operates on 24V supplied by Wattstopper Power Packs.
The sensors can operate on 24VDC, 24VAC, or half wave rectified AC.

Ultrasonic Coverage

Model UT-305-1 ..................................................... up to 500 ft

Model UT-305-2 ................................................... up to 1000 ft

Model UT-305-3 ................................................... up to 2000 ft

Sensitivity Adjustment ............. Minimum to Maximum (trimpot)

Frequency .......................................................................40kHz

UL & CUL Listed for use with Wattstopper Power Packs

U.S. Patents: 7,277,012

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COVERAGE PATTERN

The UT-305 is available in 3 models. Each model has a different size
coverage pattern. The coverage shown represents walking motion at a
mounting height of 8 to 10 feet. For building spaces with lower levels of
activity or with obstacles and barriers, coverage size may decrease.

Drawings not to scale.

PLACEMENT GUIDELINES

Depending upon obstacles such as furniture or partitions, the area
of coverage may be less or more than the sensing distances shown
in the coverage pattern. This must be considered when planning the
number of sensors and their placement. It is also recommended to
place the sensor 4 to 6 feet away from air supply ducts.

Mount the sensor to the ceiling. The UT-305 is designed for a
ceiling height of about 8-10 feet. Mounting above or below this range
will significantly affect the coverage patterns. As a general rule, each
occupant should be able to clearly view the sensor.

Open Office Area Coverage: To get complete coverage in an open
office area, install multiple sensors so that there is approximately
20% overlap with each adjacent sensor’s ultrasonic coverage area.

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UT-300/305-3

UT-300/305-2

UT-300/305-1

UT-300/305-3

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APPLICATION

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Rear Housing

Depluggable
Te

Front Cover

Ceiling

Spring Clips (2)

UT-305

UT-305

Rear Housing

Depluggable
Te

Front Cover

Ceiling

Spring Clips (2)

WIRING DIRECTIONS

WARNING: TURN THE POWER OFF AT THE

CIRCUIT BREAKER BEFORE WIRING.

Each Wattstopper BZ series power pack can supply power for 5 UT-305 sensors.
When using more sensors than this, multiple power packs are required.

Refer to the wiring diagram for the following procedures:
Connect the low voltage:

• RED wire (+24VDC) from power pack to the +24V terminal on the sensor.

• BLACK wire (Return) from power pack to Common terminal on the sensor.

• BLUE wire from power pack to Control Out terminal on sensor.

To add a manual switch such as the LVS-1 Momentary Toggle Switch, or RS2-3
Low Voltage Momentary Switch to the above applications–connect:

• Wire from one side of switch to +24V terminal on sensor.

• Wire from other side of switch to Man Switch terminal on sensor.

CONNECTING WIRES

• Care should be taken to separate high voltage power from low voltage (Class 2) control wiring.

• All connections to sensor are low voltage, Class 2.

Standard wiring with local off switch Manual-On wiring with low voltage momentary switch

Line
Neutral

Power Pack

Line
Neutral

Feed Through

Load #1

Power Pack

03624r2

Man. Switch

LISTED

88T9
Appliance
Control

Control Out.

+24V

Common

UT-305

v3

Ultrasonic

Occupancy Sensor

40kHz Ultrasonic

+24VDC/VAC

Connect to Watt Stopper

Class 2 Power Packs

For Indoor Use Only

U.S.Patents:

5,640,113

Patent Pending

Wiring
terminals

Feed Through

Load

Low Voltage

rminal

Class 2

Black

Common

Red

+24V

Blue

Control Out

Line
Voltage

Load #2
(Optional)

#1 #2

Line Voltage

Switches

Low Voltage

rminal

Class 2

Red

+24V

Black

Common

Blue

Control Out

Man.Switch

Line Voltage

+24V

Man.Switch

Jumper

Back

LVS-1

LVS-1

For low voltage
momentary switch, set
DIP switch #6 ON

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MOUNTING THE SENSOR

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Depluggable terminal

cover

Directly to Ceiling

1. Attach the plastic spring clips to the edge of the sensor in the slots provided.

2. Cut a 3.5” to 4” round hole in the acoustic ceiling tile at the mounting location. A 3.5” hole
is recommended for a secure fit.

3. Pull the low voltage wire from the power pack to the sensor through the hole.

4. Connect the low voltage wires to the appropriate terminals on the sensor.

5. Push the sensor up through the hole until the Spring Clips hold the sensor securely in
place.

6. Snap the front cover onto the sensor.

Ceiling

Spring clips (2)

Rear
housing

Front

Using an Octagonal J-Box

1. Pull the low voltage wires from the power pack into the J-Box through the conduit
knockout.

2. Connect the low voltage wires to the appropriate terminals on the sensor.

Ceiling Mount

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3. Loosen the appliance mounting screws attached to the J-Box

4. Align the sensor in the J-Box so that the mounting screws on the box match the key
holes on the sensor’s rear housing.

5. Push the sensor up into the J -Box and twist it so that the mounting screws are seated in
the keyhole slots.

6. Tighten the two screws to secure the sensor to the J-Box.

7. Snap the front cover onto the sensor.

J-Box Mount

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SENSOR ADJUSTMENT

NOTE: This unit is pre-set for basic operation as described in this guide. Adjustment is optional.

The sensors are factory preset to allow for quick installation in most applications.
Verification of proper wiring or coverage, or customizing the sensor’s settings can
be done using the following procedures. To make adjustments, open the Front

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Cover with a small screwdriver.
Before making adjustments, make sure the office furniture is installed, lighting

circuits are turned on, and the HVAC systems are in the overridden/ on position.
VAV systems should be set to their highest airflow. Set the Time Delay to the

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desired settings. See DIP Switch Setting.

To Test Occupancy Sensors

1. Ensure the Time Delay is set for Test Mode* using the “Test Mode/20

minutes” setting. (DIP Switches 1, 2, & 3 are OFF).

2. Ensure that the Ultrasonic Sensitivity trimpot is set to about 70%, clockwise.

3. Remain still. The LED should not flash. The lights should turn off after 5

seconds. (If not, see Troubleshooting.)

4. Move about the coverage area. The lights should come ON. Adjust the Ultrasonic Sensitivity as necessary to provide the desired

coverage (Green LED indicates activation from the ultrasonic sensor).

When testing and adjustment are complete, reset DIP Switches to the desired settings, and replace the cover on the sensor.
*Test Mode is a temporary state that starts when you first set the sensor’s DIP Switches for the “Test Mode/20 minutes” (Switches 1, 2,

3 OFF). If you need to invoke the Test Mode and the DIP Switches are already set for Test Mode/20 minutes, toggle DIP Switch 1 ON,
then back to the OFF position. This provides a 10 minute test period. During the test period, the Time Delay is only 5 seconds.

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DIP SWITCH SETTING

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= OFF

Time Delay: Switches 1, 2, 3

The sensor will hold the lights ON as long as occupancy is detected. The time delay countdown starts when no
motion is detected. After no motion is detected for the length of the time delay, the sensor will turn the lights OFF.

Walk-Through Switch 4

Walk-Through mode turns the lights OFF three minutes after the area is initially occupied, if no motion is
detected after the first
30 seconds. If motion continues beyond the first 30 seconds, the selected time delay applies.

Service: Switch 5

To override all sensor functions, set DIP Switch 5 to the ON position. The green LED will come on and stay on
for the duration of the override. This bypasses the occupancy control functions of the sensor, but still allows
the lights to be manually controlled with a light switch, if one is installed.

Time Delay

Test Mode/20 min

30 seconds

5 minutes
10 minutes
15 minutes
20 minutes
25 minutes
30 minutes

Walk-Through

Enabled

Disabled

On Mode: Switch 6

The Manual ON function is facilitated by installing a momentary switch such as a Wattstopper LVS-1
Momentary Toggle Switch, or RS2-3 Low Voltage Momentary Switch. This switch connects to the sensor’s
Manual (Man.) Switch and +24V terminals as shown in the wiring diagram. Each time the switch is pressed,
the load changes state. The sensor’s operation as related to the manually operated switch is determined by
the setting for DIP Switch 6.

Manual On: In this mode, the switch is required to turn ON the load. The sensor is then used to keep the load
on, based on occupant activity. After the time delay ends, if there is no movement detected within the
30 second re-trigger period the manual switch must be used to turn ON the load.

Automatic On: This mode uses occupancy as well as switch activation to turn the load ON. A manual switch
provides the following additional functionality:

1. The load can be turned ON by manual switch activation and it stays on as long as occupancy is detected. The sensor time delay
operates as programmed. When the load turns OFF due to lack of occupancy detection, the load can be turned ON again by
occupancy detection or switch activation.

2. Activating the manual switch while the load is ON turns the load OFF.

• When the load is turned OFF manually, as long as the sensor continues to detect occupancy the load stays OFF. For the

selected time delay, the lights stay OFF and the sensor reverts to the automatic-on mode.

• When the load is turned OFF manually, pressing the switch again turns the load ON and the sensor reverts to the automatic-on mode.

• Once the sensor returns to automatic-on mode, either the switch or occupancy detection can turn the load ON.

Service

Service
Normal

On Mode

Manual On
Auto On

= Factory Setting

= ON

Switch#

123

4

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5



6

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OVERLOAD PROTECTION

The occupancy sensor has a built in overload protection function that will automatically turn OFF the control output when the load
current exceeds 200mA. The sensor LED will then blink rapidly (~ 10Hz) to provide a visual indication of an overload condition. When
the load current is corrected or returns to normal, the control output will turn back ON.

TROUBLESHOOTING

For any unexpected operation:

1. Check DIP switch settings.

2. Make sure the switches are set according to the defined settings in the DIP Switch Setting chart.

Lights do not turn on with occupancy, and the LED does not ash:

1. Check that the circuit breaker has been turned back on.

2. The Ultrasonic Sensitivity setting may need to be increased.

3. Turn clockwise as needed.

4. Check all sensor and power pack wire connections.

5. Check for 24V input to the sensor.

• If 24V is present, replace the sensor.

• If 24V is not present, check that high voltage is present to power pack.

If it is, replace power pack.

Lights do not turn off automatically:

1. The sensor may be experiencing activations from outside the controlled area or from some type of interference (see “Unwanted
Sensor Activations” below).

2. Check all sensor wire connections.

3. Disconnect power pack’s blue wire:

• If the lights do not turn off, replace power pack. Reconnect blue wire.

• If the lights turn off, the problem may be in the sensor–to check:

• Reconnect the blue wire.

• Turn sensitivity and time delay to minimum and allow the sensor to time out.

If the lights turn off, the sensor is working properly (see number 1, above, and “Sensor Adjustment” for readjustment of sensor).

4. Set sensitivity and time delay to minimum and allow the sensor to time out.
If the lights turn off, the sensor is working properly (see number 1, above, and “Sensor Adjustment” for readjustment of sensor).

4

Unwanted Sensor Activations (LED ashes):

Possible causes

1. The ultrasonic sensitivity may be too high causing detection outside of desired coverage area.

2. Sensor located too close to HVAC or VAV vents with heavy air flow.

3. If LED is flashing rapidly (~10Hz), an overload condition exists. When this is corrected, the sensor will return to normal operation.

Possible solutions

1. Reduce the ultrasonic sensitivity (counterclockwise) as needed (see “Sensor Adjustment”).

2. Relocate the sensor.

3. Check the blue wire connection. If necessary, replace the power pack.

ORDERING INFORMATION

Catalog# Description

UT-305-1 Ultrasonic Occupancy Sensor, up to 300 sq ft coverage, Low Voltage with Manual On Feature

UT-305-2 Ultrasonic Occupancy Sensor, up to 1000 sq ft coverage, Low Voltage with Manual On Feature

UT-305-3 Ultrasonic Occupancy Sensor, up to 2000 sq ft coverage, Low Voltage with Manual On Feature

BZ-50 Power Pack: 120/277VAC, 50/60Hz, 20A ballast or incandescent

BZ-150 Power Pack: 120/277VAC, 50/60Hz, 20A ballast or incandescent, with Hold-On and Hold-Off capability

BZ-200 Power Pack: 120/277VAC, 50/60 Hz, 20A Ballast/ELV/MLV/Incandescent/LED, 16A, E-Ballast/CFL/Plug Load

BZ-250 Power Pack: 120/277VAC, 50/60 Hz, 20A, Ballast/ELV/MLV/Incandescent/LED, 16A E-Ballast/CFL/Plug Load,

with Hold-On/Hold-Off capability

BZ-250-347 Power Pack: 120/347VAC, 50/60 Hz, 16A Ballast/ELV/MLV/Incandescent/LED/ E-Ballast/CFL, 15A Plug Load,

with Hold-On/Hold-Off capability

Sensors are White. BZ series power packs supply power for up to 5 UT-305 sensors.

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