ETC Echo Light Sensor User Manual

ETC Installation Guide

Light Sensor Head

with Controller

Thread

extender

Light Sensor

Head

Unison® Echo Light Sensor

Overview

The Echo Light Sensor provides light level measurement and lighting control
for the connected Echo control system. The Echo Light Sensor measures
lighting conditions to maintain a programmed lighting output in both dimmed
and switched systems.

Light Sensors are available in three models:

• E-LS - Light Sensor Head with Controller

• E-LSC - Light Sensor Controller Only

• E-LSH - Light Sensor Head Only
Each controller supports one or two Light Sensor Heads and is available in
white or black finish.

A Light Sensor Head may be installed within the controller or installed remotely,
using up to 1,000 feet (304m) of 16 AWG wire per controller. When using a pair
of Light Sensor Heads, both sensors transmit their light readings to a single
Light Sensor Controller. The controller averages the levels and uses them to
control lighting within the space.

Wire Specification

Controller

The Light Sensor Controller utilizes EchoConnect for power and for data
communications with an Echo Control System. EchoConnect is a bidirectional
protocol that uses one pair of wires (data + and data -) for both data and power.
ETC recommends using Belden 8471 (or approved equal) Class II wire. The
total combined length of an EchoConnect wire run (using Belden 8471 or
equal) may not exceed 1,640 feet (500m).

Corporate Headquarters
London, UK

 Unit 26-28, Victoria Industrial Estate, Victoria Road, London W3 6UU, UK  Tel [phone]  Fax [phone]

Rome, IT 

Via Pieve Torina, 48, 00156 Rome, Italy  Tel [phone]  Fax [phone]

Holzkirchen, DE
Hong Kong  Rm 1801, 18/F, Tower 1 Phase 1, Enterprise Square, 9 Sheung Yuet Road, Kowloon Bay, Kowloon, Hong Kong  Tel [phone]
Service:

(Americas) [e-mail] 

Web:

www.etcconnect.com 

7186M2170 

 3031 Pleasant View Road, P.O. Box 620979, Middleton, Wisconsin 53562-0979 USA  Tel [phone]  Fax [phone]

 Ohmstrasse 3, 83607 Holzkirchen, Germany  Tel [phone]  Fax [phone]

(UK) [e-mail]  (DE) [e-mail] 

Rev A  Released 2014-08  ETC intends this document to be provided in its entirety.

Copyright © 2014 ETC. All Rights Reserved.  Product information and specifications subject to change.

(Asia) [e-mail]

ETC Installation Guide

Echo™ Light Sensor

Note:

Note:

Note:

All control wiring should be installed and terminated by a qualified
installer and should follow standard wiring installation practices.

Leave approximately 10 inches (254mm) of wiring in the back box
to allow slack for future service needs.

ETC requires that all sensors be grounded. Pull an additional 14
AWG (1.5mm2) wire for grounding when control wires are not
installed in grounded metal conduit.

When using Category5 (or equivalent) cable on the EchoConnect
communication bus, please note the following:

- Not all topologies are supported using Cat5; careful planning is
required to ensure the proper termination kits are available and
the wire is pulled appropriately.

- Cat5 wiring must be terminated using EchoConnect Cat5
Termination Kit, and it must be installed using a bus topology.
Refer to the installation guide provided with the Cat5 Termination
Kit (7186A1207) for information to terminate Cat5 wiring.

Remoting the Light Sensor Head

The Light Sensor Controller provides termination for up to two remote Light
Sensor Heads. Each Light Sensor Head must be separately wired to the
controller using no more than 1000 feet (304m) of 16 AWG wire total per
controller. These wire runs must remain separate from EchoConnect wiring.
ETC recommends using Belden 8471 (or equivalent) wire.

Installation Environment

The Light Sensor Controller is intended for installation to a finished ceiling
surface, soft ceiling tile, attached to a round junction box or single-gang RACO
junction box. The controller operates in ambient temperatures of 0°C to 70°C,
non-condensing humidity.

The Light Sensor Head can be mounted directly into the controller, installed to
a 1/2” conduit knockout, or installed into a soft ceiling tile using the provided
thread extender. The Light Sensor Head can be installed outdoors when
mounted to a weatherproof enclosure. The sensor in this weatherproof
installation scenario operates in ambient temperatures of -25°C to 70°C.

Echo Light Sensor Installation Guide Page 2 of 12

ETC Installation Guide

Echo™ Light Sensor

Parts and Supplies

The following parts and supplies are included with the specific Light Sensor
assembly ordered:

Light Sensor

Parts and Supplies

Soft ceiling tile adaptor XX
EchoConnect and ground wire pigtails X X
Light Sensor Head thread extender XX
1 each nuts and washers 3/4” and 1” X X
2 each screws 6-32 x 3/4” and 1 3/4” XX
Blank sensor head X X

Note:

- Follow all local code requirements for terminating wire.

- Use appropriately sized wire nuts (not provided) to secure each
termination.

Head with
Controller

(E-LS)

Light Sensor

Head

(E-LSH)

Light

Sensor

Controller

(E-LSC)

Installation

The Light Sensor Controller is provided with a twist-lock mounting plate that
can be mounted to a finished ceiling, junction box, or soft ceiling tile. Determine
the installation method and follow the specific instructions detailed.

• Install in Junction Box on page 4

• Soft Ceiling Tile Installation on page 6

• Installing the Light Sensor Heads Remotely (optional) on page 7

Note:

The EchoConnect pigtail is only required when the sensor and
controller are installed in series with other sensors. If you are not
continuing the data run, direct termination is recommended on
the sensor control board.

Page 3 of 12 Echo Light Sensor Installation Guide

ETC Installation Guide

Terminate

wires here

Optional

sensor wires

Termination is available at the Controller for the
EchoConnect communication bus and up to two

Light Sensor Heads. Flexibility is provided with regards

to how the Light Sensor Head(s) is installed. You can

install a Light Sensor Head at the controller, or you can

install up to two Light Sensor Heads remotely.

Echo™ Light Sensor

Install in Junction Box

Step 1: Pull Belden 8471 (or equivalent) and 14 AWG (2.5mm2) ground wire to

the junction box.

Step 2: If you are installing the controller in series (continuing the data run)

to other sensors, sensor controllers, or stations, use the provided
EchoConnect pigtail and ESD ground pigtail to make the terminations.
If you are not continuing the data run, the pigtails are not required,
proceed to Step 3.

Note:

Primary Sensor and Optional Sensor wires should terminate
directly to the terminals located on the controller. See “Installing

the Light Sensor Heads Remotely (optional)” on page 7.

a: Strip each wire to the appropriate length, depending on the wire nut

or other termination used (wire nuts are not provided).

b: Twist the data - (typically black) EchoConnect wire, the black lead

from the EchoConnect pigtail, and any continuing EchoConnect
(typically black) wire together and secure with the wire nut.

c: Repeat the above steps for the data + (typically white)

EchoConnect wires, and for the ESD ground wires.

Step 3: If you are installing the Primary and/or Optional (second) Light

Sensor Head remotely from the controller, reference Installing the

Light Sensor Heads Remotely (optional) on page 7, then return to

these instructions. If you are not remoting a Light Sensor Head,
proceed to Step 4.

Echo Light Sensor Installation Guide Page 4 of 12