Legrand DT-205 Dual Technology Occupancy Sensors Instruction Manual

Legrand DT-205 Dual Technology Occupancy Sensors

SPECIFICATIONS

The DT-205 is an occupancy sensor that provides coverage of up to 2000 sq ft for walking motion and up to 1000 sq ft for desktop motion. It has an elliptical coverage pattern and a dense wide-angle lens. The sensor is designed for a ceiling height of about 8-10 feet and provides coverage for building spaces with lower levels of activity or with obstacles and barriers.

DESCRIPTION AND OPERATION

The DT-205 provides an elliptical coverage pattern. The coverage shown represents walking motion at a mounting height of 10 feet. 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. It is recommended to place the sensors 4 to 6
feet away from air supply ducts. The Ultrasonic coverage cannot be masked, but you can adjust its sensitivity to reduce the coverage area.

COVERAGE PATTERN

The DT-205 provides an elliptical coverage pattern. The coverage shown represents walking motion at a mounting height of 10 feet. For building spaces with lower levels of activity or with obstacles and barriers, coverage size may decrease.

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.

Masking the PIR Lens

Opaque adhesive tape is supplied so that sections of the PIR lens can be masked. This restricts the sensor’s view and allows you to eliminate PIR coverage in unwanted areas such as hallways outside of the desired coverage area. Since masking removes bands of coverage, remember to take this into account when troubleshooting coverage problems.

WIRING DIRECTIONS

Each Wattstopper B347-D power pack can supply power for up to 2 DT-205 sensors. Each Wattstopper BZ series power pack can supply power for 3 DT-205 sensors. When using more sensors than this, multiple power packs are required.

Manual-On wiring with low voltage momentary switch

The DT-205 sensors can be wired to a low-voltage momentary switch for manual- on control.

MOUNTING THE SENSOR

The DT-205 sensors can be mounted to walls or ceilings with the supplied swivel bracket, and the supplied junction box cover plate if necessary. Mounting at fixture height is the most effective.

Coverage Guidelines

• Mount the sensor 4 to 6 feet away from the air supply ducts.
• Leave approximately six inches between the sensor and the wall to easily access the Tightening Screw.
• Orient the Base Bracket’s Half-Circle Notch in the direction that the sensor will point.
• Each occupant should be able to clearly view the sensor.
• 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.

Dual Technology Low Voltage Occupancy Sensor (version 3)

SPECIFICATIONS

• Voltage ……………………………………………..18–28VDC/VAC half rectified
• Current Consumption @24VDC/VAC……………. 24mA (DC), 64mA (AC)
• Power Supply………………………………………….Wattstopper Power Packs
• Operating Temperature……………………………..32° to 131°F (0° to 55°C)
• Storage Temperature………………………………..23° to 176°F (-5° to 80°C)
• Relative Humidity…………………………………..5 to 95% (noncondensing)
• Time Delay Adjustment…………………………….30 seconds to 30 minutes
• Walk-Through Mode…………3 minutes if no activity after 30 sec.
• Test Mode……………………………………. 5 sec. or DIP switch reset
• PIR Coverage (Typical)………………………………………………………1000 ft²
• Sensitivity Adjustment…………..High or Low (DIP switch setting)
• Ultrasonic Coverage (Typical)………………………………………800–1200 ft²
• Sensitivity Adjustment…………… Minimum to Maximum (trim pot)
• Frequency……………………………………………………………….40kHz

DESCRIPTION AND OPERATION

The Wattstopper DT-205 Dual Technology occupancy sensors combine advanced passive infrared (PIR) and ultrasonic technologies into one unit. The combination of these technologies helps to eliminate false triggering problems even in difficult applications. The DT-205 turns lighting systems on and off based on occupancy. It offers numerous operating modes that can be combined to create the ideal custom control. The sensors can be configured to turn to light on and hold it on as long as either or both technologies detect occupancy. After no movement is detected for the duration of the time delay (30 seconds to 30 minutes) the lights are switched off. A “walk-through” mode can turn lights off after only 3 minutes if no activity is detected after 30 seconds of occupancy detection. The DT-205 operates on 24VDC supplied by Wattstopper Power Packs.

COVERAGE PATTERN
The DT-205 provides an elliptical coverage pattern. The coverage shown represents walking motion at a mounting height of 10 feet. For building spaces with lower levels of activity or with obstacles and barriers, coverage size may decrease

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. The DT-205 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. Masking the PIR Lens: Opaque adhesive tape is supplied so that sections of the PIR lens can be masked. This restricts the sensor’s view and allows you to eliminate PIR coverage in unwanted areas such as hallways outside of the desired coverage area. Since masking removes bands of coverage, remember to take this into account when troubleshooting coverage problems. The Ultrasonic coverage cannot be masked, but you can adjust its sensitivity to reduce the coverage area.

WIRING DIRECTIONS

Each Wattstopper B347-D power pack can supply power for up to 2 DT-205 sensors. Each Wattstopper BZ series power pack can supply power for 3 DT-205 sensors. When using more sensors than this, multiple power packs are required. Refer to the wiring diagram on the next page for the following procedures:
Connect the LOW VOLTAGE:
WARNING : TURN THE POWER OFF AT THE CIRCUIT BREAKER BEFORE WIRING

• RED wire (+24VDC) from the power pack to the red wire on the sensor.
• LACK wire (Return) from the power pack to the black wire on the sensor.

Wiring a single lighting load controlled by occupancy–connect:

• BLUE wire from the power pack to the blue wire on the sensor.

To add a MOMENTARY MANUAL SWITCH such as the LVS-1 Momentary Toggle Switch, to the above applications–connect

• Wire from one side of the switch to the gray wire on the sensor.
• Wire from the other side of the switch to the red wire on the sensor.

MOUNTING THE SENSOR

The DT-205 sensors can be mounted to walls or ceilings with the supplied swivel bracket, and the supplied junction box cover plate if necessary (see Figure B). Mounting at fixture height is the most effective.
Ceiling: It is best to leave approximately six inches between the sensor and the wall so that the Tightening Screw can be easily accessed. Orient the Base Bracket’s Half-Circle Notch in the direction that the sensor will point.
Wall: Orient the Base Bracket’s Half-Circle Notch, up.

1. Mount the Base Bracket to the mounting surface with screws.
2. At the center of the Base Bracket, drill a hole in the ceiling or wall (unless mounting to a junction box) large enough to thread the sensor’s wires through.
3. Guide the sensor’s wires into the Base Bracket and through the hole in the ceiling or wall.
4. Connect the sensor to the Base Bracket by angling the Post Bracket so that it is in line with the half-circle notch, as illustrated in Figure A. Push the ball into the Base Bracket opening until it snaps into place, being careful not to pinch the wires. The brackets can be easily connected or disconnected using this orientation.
5.  Insert the Tightening Screw and Nut into the Base Bracket as illustrated.
6. Use the Reference Surface Angle to adjust the sensor for optimum coverage. When mounted at ten feet, the Reference Surface Angle should be parallel to the wall or vertically (see Figure C). (As the mounting height decreases, the sensor will be tilted up slightly; as the mounting height increases, the sensor will be tilted down slightly).
7. Tighten the Tightening Screw.

Sensor Angle Adjustment

While watching the LEDs for flashes (Red LED indicates activation from the PIR sensor; Green LED indicates activation from the ultrasonic sensor), have a person walk back and forth at the far end of the space. Increase or decrease the mounting angle as needed until the desired coverage is achieved. Tighten the Tightening Screw to hold this position.

Service
To override all sensor functions, set the Ultrasonic Sensitivity trim pot to the fully counterclockwise (Service) position. 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.

SENSOR ADJUSTMENT
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 Cover with a small screwdriver. There is a 30-second warm-up period when power is first applied.
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 Logic Configuration and Time Delay to the desired settings. See Logic Configuration Chart.

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 red and green LEDs 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 is 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 and then back to the OFF position. This provides a 10-minute test period. During the test period, the Time Delay is only 5 seconds.

DIP SWITCH SETTING

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.

PIR Sensitivity: Switch 5

• Minimum forces a reduced detection range for the PIR.
• Maximum causes the DT-205 to monitor the controlled environment and automatically select the maximum sensitivity that will provide reliable operation without false detection. This setting is constantly updated.

Occupancy Logic: Switches: 6, 7, 8
The DT-205 has 8 logic configurations for occupancy triggers, set with DIP Switches 6, 7 & 8. Determine the appropriate Occupancy Logic Option using the Trigger matrix, then set the DIP switches accordingly. Initial Occupancy: The method that activates a change from “Standby” (area unoccupied and loads are OFF) to “Occupied” (area occupied and loads are ON).

• Both require detection by PIR and Ultrasonic.
• either require detection by only one technology.
• IR requires detection by the PIR.
• an. requires activation of the Manual Switch. (See Manual ON functions for further information.)
  Maintain Occupancy: The method indicates that the area is still occupied and the lights should remain ON.
  Re-trigger: After the time delay elapses and the lights turn OFF, detection by the selected technology within the number of seconds indicated turns the lights back ON

MANUAL ON FUNCTION

The Manual ON function is facilitated by installing a momentary switch such as Wattstopper LVSW Momentary Toggle Switch. The switch connects to the sensor’s Manual (Man.) Switch and +24VDC 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 DIP Switch settings for Occupancy Logic.

Manual Mode (Trigger Option 6 or 7): In this mode, the switch is required to turn on the load. The sensor keeps 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 load turns OFF and the manual switch must be used to turn ON the load. Automatic Mode (any Trigger Option except 6 or 7): These options use occupancy triggers as well as switch activation to turn the load ON. A manual switch provides the following additional functionality:

• The load can be turned ON using the manual switch and it stays on according to the occupancy logic setting. The time delay operates as programmed. When the load turns OFF due to a lack of occupancy detection, it can be turned ON again by occupancy detection or the switch.
• Activating the manual switch while the load is ON turns the load OFF.
• hen the load is turned OFF manually, as long as the sensor continues to detect occupancy the load stays OFF. The length of the time delay after the last occupancy detection, 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.
• since returning to automatic-on mode, either the switch or occupancy detection can turn the load ON.

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 LEDs 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 when entering the room.
Neither LED Flashes.

1. Check that the circuit breaker has been turned back on.
2. Check all sensor and power pack wire connections.
3. Check for 24VDC input to the sensor between the red and black low-voltage wires.
   • If 24VDC is present, replace the sensor.
   • If 24VDC is not present, check the high voltage connections to the power pack.
   • If high voltage connections are good and high voltage is present, replace the power pack.

The red LED does not flash

1. When power is initially applied to the sensor, there is a warm-up period of 30 to 60 seconds before the LED becomes active.
2. Make sure PIR sensitivity is set to 100% (DIP switch #5 is in the “off” position).

Green LED does not flash
Ultrasonic sensitivity settings may need to be increased. Turn the adjustment trimpot clockwise until the LED begins to flash when movement occurs.

Green LED is on steady
Check ultrasonic sensitivity trimpot. The fully counterclockwise position is the override for the sensor. Turn the trimpot clockwise until LED flashes only when movement occurs in the desired coverage area.

Red and Green LEDs flash

1. Check all sensor and power pack connections.
2. Check for 24VDC at the power pack blue and black wire connections to the sensor while the sensor is active.
   • If there is no voltage, replace the sensor.
   • If there is voltage, check for 24VDC between the blue and black wire at the power pack. If 24VDC is present and the relay is not closing, replace it.
   • If 24VDC is not present, check for a break in the low-voltage wiring.
3. If the LED is flashing rapidly (~10Hz), an overload condition exists. When this is corrected, the sensor will return to normal operation. Check the blue wire connection. If necessary, replace the power pack.

Lights do not turn off automatically

Green LED flashes
Reduce ultrasonic sensitivity by turning the adjustment pot counter-clockwise until it only flashes when movement occurs.

Red LED flashes briefly and Green LED does not flash
Check to see if you have used the Manual Switch connection. Do not connect anything to this terminal if you are not using a low-voltage momentary switch between the sensor and the power pack.

The red LED randomly flashes
Set PIR sensitivity to a minimum by turning DIP switch 5 to the “on” position.

The lights do not turn off

1. Check all sensor and power pack wire connections.
2. Disconnect the power pack blue wire.
   • If the lights do not turn off, check the power pack wiring. Replace the power pack if necessary.
   • If lights turn off, the problem may be the sensor or wiring between the sensor and the power pack.
3. Reconnect the blue wire.
   • Turn sensitivity and time delay to a minimum, and allow the sensor to time out.
   • If lights turn off, the sensor is working properly – adjust sensitivity and time delay for the sensor.
   • If the lights do not turn off, check the wiring between the sensor and the power pack.
   • If the wiring is correct, replace the sensor.

ORDERING INFORMATION

connected, 20A ballast/incandescent
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

WARRANTY INFORMATION

Wattstopper 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 Wattstopper 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.

No. 24220 – 10/22 rev. 3
Copyright 2022 Legrand All Rights Reserved.800.879.8585 www.legrand.us/wattstopper

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