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

2
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
6m
19m
Sensitivity set to 80%
Detector head position set to 40°
2.6m
6m
19m
Sensitivity set to 80%
Detector head position set to 40°
6m
30m
2.6m
6m
23m
Sensitivity set to maximum
Detector head position set to 80°
6m
30m
2.6m
6m
23m
Sensitivity set to maximum
Detector head position set to 80°
2.6m
6m
17m
Sensitivity set to maximum
Detector head position set to 0°
2.6m
6m
17m
Sensitivity set to maximum
Detector head position set to 0°

3
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
2
If the range is compromised by the
ceiling construction / material. Add the
supplied 20mm spacer ring.

4
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

5
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

6
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 .

7
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

8
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.

9
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

10
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.