C.P. Electronics MWS3A-AT-PRM User manual

Overview

The MWS3A-AT-PRM is a microwave motion sensor

combined with a switched output channel.

The MWS3A-AT-PRM detects movement using a highly

sensitive microwave detector. This works by emitting low

power microwave signals and measuring the reflections as

the signals bounce off moving objects.

The output channel comprises a mains voltage relay

capable of simple on/off switching.

Functioning as a presence detector, the unit can turn lights

on when a room is occupied and off when the room is

empty. Optional settings allow lights to be turned off in

response to ambient daylight. The unit also includes stored

scenes for versatile manual on / off control of lighting.

The MWS3A-AT-PRM can be used as a standalone unit or

integrated with other devices as part of a system. The

built-in RF transceiver allows wireless communication with

all other An-10®compatible products, e.g. the AT-BB-IN

Input Unit, useful for push-button scene selection and

absence detection.

All functionality is fully programmable.

Features

Microwave Sensor

Detects movement within the unit’s detection range,

allowing load control in response to changes in occupancy.

IR Receiver

Receives control and programming commands from an

IR (infrared) handset.

Light Level Sensor

Monitors the ambient light level, allowing load control

based on minimum and maximum Lux Level.

Status LEDs

These flash Red and/or Green to indicate the following:

Power Input & Switched Output Connector (Channel 1)

Used to connect mains power to the unit and to connect a

switched load.

Front features

Back features

Walk Test LED active when movement is detected

Valid setting received

Invalid setting received

Software reset received

Factory reset received

RF ceiling microwave presence detector –Switching

MWS3A-AT-PRM

Product Guide

Front features

Sensor Lens

which covers...

Microwave Sensor

IR Receiver

Light Level Sensor

Status LEDs

Mounting Bezel

Choosing a Suitable Location

The MWS3A-AT-PRM is designed to be ceiling mounted

and must satisfy the following criteria:

 Avoid positioning the unit where direct sunlight may

enter the sensor element.

 Do not site the sensor within 1m of any lighting, forced

air heating or ventilation.

 Do not fix the sensor to an unstable or vibrating

surface.

 Position the sensor so that the occupants of the room

fall inside the detection zone shown in below.

Note that the detection zone illustrated is based on a

recommended mounting height of 2.8m. A lower height

will decrease the overall size of the detection zone.

Installation

Detection diagrams

Ideal for large office or classroom Ideal for corridor or aisle applications

Ideal for open plan areas and offices

Note. If the range is compromised by the ceiling construction /

material. Add the supplied 20mm spacer ring. See page 3 for

fitting details.

2.6m

19m

Sensitivity set to 80%

Detector head position set to 40°

2.6m

19m

Sensitivity set to 80%

Detector head position set to 40°

30m

2.6m

23m

Sensitivity set to maximum

Detector head position set to 80°

30m

2.6m

23m

Sensitivity set to maximum

Detector head position set to 80°

2.6m

17m

Sensitivity set to maximum

Detector head position set to 0°

2.6m

17m

Sensitivity set to maximum

Detector head position set to 0°

The MWS3A-AT-PRM is designed to be mounted using either:

 Flush fixing, or

 Surface fixing, using the optional Surface Mounting Box (part no. MWS3A-DBB).

Both methods are illustrated below.

Warning - be careful bending springs when mounting unit.

Installation

Important

Ensure that the cables are formed as shown

before affixing the cable clamp. The clamp

MUST clamp the outer sheath(s) only.

Bend cores as shown.

Wire stripping details

Flush fixing

Surface fixing

Head locking

1 32 4

Hole Ø30mm

MAX

1 2

Remove metal

locking clip from

rear of unit.

 Adjust head to

required position.

 Push clip into position

shown below to lock

head.

 To remove clip, lever

out with a small

screwdriver.

1 543

Hole Ø74mm Attach cable clamp

If the range is compromised by the

ceiling construction / material. Add the

supplied 20mm spacer ring.

Single channel switching

Functionality

 Simple On/Off load control.

 Presence detection.

 Absence detection using an AT-

BB-IN Input Unit and associated

switch/button plate.

 Manual On/Off control using IR

Handset.

 Lux switching.

The switched output of the MWS3A-AT-PRM is used to

switch a channel of standard, non-dimming luminaires.

Multiple luminaires may be connected in parallel to the

switched output (via the Nand L/Out terminals) as long as

the maximum total load is not exceeded.

The wiring example below shows the method of connecting

the switched output channel for a single detector unit.

Wiring examples

When power is applied to the unit, the load will turn on immediately.

Vacate the room or remain very still and wait for the load to switch off (this should take around 10 minutes).

Check that the load switches on when movement is detected.

The unit is now ready for programming.

Power-up test procedure

What if the load does not turn ON?

 Check that the live supply to the circuit is good.

 Check that the load is functioning by bypassing the sensor (e.g. link terminals Land L/ Out on Channel1).

 Check that the unit is correctly addressed, see ‘Step 1: Set channel addresses and channel load type’ on page 7.

 If the detection range is smaller than expected, check the diagram on page 2. Adjusting the angle of the sensor head

slightly may improve the detection range. If still reduced it may be compromised by the ceiling construction /

material. Add the supplied 20mm spacer ring. See page 3 for fitting details.

HINT: The Walk Test LED function can be used to check that the unit is detecting movement in the required area

(see page 8 for further details).

What if the load does not turn OFF?

 Ensure that the area is left unoccupied for longer than the Time Adjustment Period (default is 10 minutes).

 Ensure that the sensor is not adjacent to circulating air, heaters or lamps.

HINT: The Walk Test LED function can be used to check that the unit is detecting movement in the required area

(see page 8 for further details).

Fault finding

Basic programming

The functionality of the MWS3A-AT-PRM Sensor is

controlled by a number of parameters which can be

changed or programmed by any of the following devices:

 UHS4 Infrared Handset

 UNLCDHS Infrared Handset (with LCD)

For most basic programming operations the UHS4 handset

is recommended and the following procedures are based

on using this device.

Point the handset at the Sensor and send the required

programming commands to the unit as shown in Steps 1, 2

and 3.

Valid commands will be indicated by a green LED flash.

See page 1 for details of other LED responses.

Important note

Do not use as hub if the installation uses Area Codes. If Area Codes are used, make a non MWS3A-AT detector

or Slim-line controller a hub in the same local codes as the MWS3A-AT .

Step 1: Set channel addresses and channel load type

The Sensor has one output channel:

 Channel 1 - Switched Output

and one input channel:

 Channel 3 - Microwave Sensor

To relate the function of different channels it is necessary

to set the addresses correctly. For example, a scene

select message sent from a device with a Local Code of 1

will only be actioned by devices that also have a Local

Code of 1.

To program the settings for a specific channel on the

Sensor you must specify the appropriate channel number

(i.e.1 to 3) using the programming device.

If no channel number (or channel 0) is specified, all

channels will be set to the same address.

The output channel also has a Circuit number. This allows

different physical channels to be linked and controlled as

a single Circuit.

Basic programming

Step 2: Set-up sensor functionality

Detection Mode

The Detection Mode for the output Channel 1 can be set to

behave in Presence or Absence mode:

 Presence mode allows a channel to turn on when

movement is detected. Once turned on, if no movement

is detected the Time Adjustment (10 minutes by

default) the channel will turn off.

 Absence mode requires the channel to be turned on by

some other means (e.g. by issuing a Scene Select

message via an Input Unit or IR Handset). Once turned

on, if no movement is detected for period of time (the

Time Adjustment) the channel will turn off.

In either case, sensitivity to movement of the Microwave

sensor (Channel 3) can be adjusted using the Sensitivity

parameter (set to 5 by default).

HINT: To assist in setting the Sensitivity, turn on the Walk

Test LED which will flash red when movement is detected.

By default when the detector turns on Local Scene 1 is

selected. When the detector turns off Local Scene 20 is

selected. See ‘Scenes Used for Occupancy Detection’ in

Step 3 for further details.

Switch Level On/Off

Occupancy detection can be made dependant on the

ambient light level using the Lux On Level and Lux Off

Level parameters.

Basic programming

Note: for applications where there is only one channel of lighting

being controlled in a room there is no need to select the channel

number.

The MWS3A-AT-PRM has capacity to store 20 Local

Scenes and 120 Area Scenes. By default all Scenes are

pre-programmed with the following channel levels, but

these can be changed as required:

NOTE: Local Scene 20 and Area Scene 120 are

designated ‘off’ scenes within a system and should

normally be programmed with all channels off or at zero.

Scenes can be recalled by using an IR Handset or by a

switch/button plate via an AT-BB-IN Input Unit.

Local Scenes

1 2 3 4 5 6 ... 19 20

Ch1 on on on on on on ... on off

Area Scenes

101 102 103 104 105 106 ... 119 220

Ch1 on on on on on on ... on off

Step 3: Re-program scenes

Scenes Used for Occupancy Detection

If movement is detected (in Presence mode), Local On

Scene 1 is selected. By default this switches Channel 1

On.

If no movement is detected for the Time Adjustment Period

(in Presence or Absence mode), Local Off Scene 20 is

selected. By default this switches Channel 1 Off.

NOTE: These ‘On’ and ‘Off’ Scene selections cannot be

changed using the UHS4 handset. You can, however,

reprogram, on or off values, for Scenes 1 and 20 if

required.

Note: + and - will toggle between

On and Off.

Basic programming

Example 1: Offices and corridor

Application examples

Example 1 shows two small offices, each with four downlighters controlled by a single MWS3A-AT-PRM sensor. These

are set-up for Presence detection such that the lights turn on when anyone enters the room and turn off when the room

is vacated.

Similarly, the corridor lights are controlled by two sensors such that if either sensor detects movement, all of the corridor

lights turn on. Note that only one sensor is physically wired to the lighting circuit.

In this arrangement the devices in each room need to be programmed with a unique Local Code, although the two

devices in the corridor share the same code so that they can both control the corridor lights.

In addition, each unit needs its Time Adjustment Period set to an appropriate value.

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