RS PRO 796-2053 User manual

Overview
The 796-2053 microwave presence detector provides
automatic control of lighting loads with optional manual
control.
The 796-2053 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 796-2053 has a unique adjustable sensor head
that allows the area of detection to be optimised for the
application.
All functionality is fully programmable using an IR handset.
Features
Front features
Back features
Ceiling microwave presence/absence detector
796-2053
Product Guide
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
Measures the overall light level in the detection area
Status LEDs
The LED flashes Red to indicate the following:
Power Input & Switched Output Connector
Used to connect mains power to the unit and to connect a
switched load.
Switch Input Connector
Two input terminals can be used to manually override the
lights on or off.
Walk Test LED active when movement is detected
Valid setting received
Retaining Spring
Retaining Spring
Power Input
& Switched
Output Connector
Switch Input
Connector
Sensor Lens
which covers...
Microwave Sensor
IR Receiver
Light Level Sensor
Status LEDs
Mounting Bezel

2
Detection diagrams
Detection Mode
The Detection Mode can be set to behave in Presence or Absence mode:
 Presence When movement is detected the load will automatically turn on. When the area is no longer occupied the
load will automatically switch off after an adjustable time period.
 Absence The load is manually switched on. When the area is no longer occupied the load will automatically switch
off after the adjustable time period has elapsed.
In either case, sensitivity to movement of the microwave sensor can be adjusted using the Sensitivity parameter.
HINT: To assist in setting the Sensitivity, turn on the Walk Test LED which will flash red when movement is detected.
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.
Sensor functionality
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 4 for
fitting details.

3
Installation
Absence detection
 To use absence detection a retractive (momentary) switch must be connected between the 2 terminals on the
diagram. Note that this will be switching mains voltage.
 The unit ships with presence detection as default. To change to absence detection, press and release the external
switch 5 times within the first minute of power up. The LED will turn on solid for 30 seconds to indicate absence
mode has been selected.
 To change back to presence detection, repeat the above procedure—the LED will flash for 30 seconds to indicate
presence mode has been selected.
Note: the above adjustments can also be made using the UHS5 or UNLCDHS handsets. See Programming sections.
When power is applied to the unit, the load will turn on immediately.
Set the timeout to 10 seconds, vacate the room or remain very still and wait for the load to switch off .
Check that the load switches on when movement is detected.
The unit is now ready for programming.
Power-up test procedure
Choosing a Suitable Location
The detector should be sited so that the occupants of the room fall inside the detection pattern shown opposite).
 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.
 Avoid metallic objects directly in front of the sensor head.

4
Designed to be mounted using either:
 Flush fixing, or
 Surface fixing, using the optional Surface Mounting Box (part no. 796-2081).
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
1 543
Hole Ø74mm Attach cable clamp
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.
2
If the range is compromised by the
ceiling construction / material. Add the
supplied 20mm spacer ring.

5
Basic programming
Parameter
Name
Default
Value
0123796-2097 Handset Graphics Description
Button Activation
On On Turn lights on.
Off Off Turn lights off.
Walk test Off On Off When set to On this causes a red LED to flash on
the sensor when it detects movement. Use this
feature to check for adequate sensitivity levels.
Time Out
(Time
adjustment)
20 mins 1, 10 &
20
minutes
5, 15 &
30
minutes
10
seconds
Once the detector is turned on, this value sets
how long the lights will stay on once movement
has ceased.
Lux on
level
(Switch
level on)
9 2, 5 & 7 4, 6 & 9 Lux level setting to prevent the luminaires being
switched on if the ambient light level is sufficient
(adjustable between 1 and 9). The luminaires will
always be switched on at level 9.
Lux off
level
(Switch
level off)
9 2, 5 & 7 4, 6 & 9 Lux level setting to switch the luminaires off during
occupancy if the ambient light level goes above
the setting (adjustable between 1 and 9). Level 9
will always keep the lights on. This setting can be
used for “window row switching”.
Note: the Lux Off Level value must always be
greater than the Lux On Level value.
Sensitivity 9 1, 5 & 9 3, 6 & 8 Sensitivity level for detecting movement.
1 = low sensitivity
9 = high sensitivity
Defaults D Returns the unit to the default settings.
Presence /
Absence
Presence Presence Absence Presence mode allows the output to turn on when
movement is detected and off when movement
ceases. Absence mode allows the output to turn
off when movement ceases, but must be manually
turned on first.
Shift Use this button to select the settings in red and
blue signified by the ‘Shift 1’ and ‘Shift 2’ LEDs
Number of Shift key presses
The functionality is controlled by a number of parameters which can be
changed or programmed by any of the following devices:
 796-2097 Infrared Handset. See below for programmable functions.
For most basic programming operations the 796-2097 handset can be used 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
below.
Valid commands will be indicated by a red LED flash. See page 1 for details of other LED responses.
Note: other functions on the 796-2097 which are not shown below are not applicable to this product.
SHIFT 1 SHIFT 2 SHIFT 1 SHIFT 2
SHIFT 1 SHIFT 2
SHIFT 1 SHIFT 2
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).
 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 4 for fitting details.
HINT: The Walk Test LED function can be used to check that the unit is detecting movement in the required area.
What if the load does not turn OFF?
 Ensure that the area is left unoccupied for longer than the Time Out Period.
 Make sure that the sensor is not adjacent to vibrating surfaces or objects (e.g. ventilation equipment).
 The unit may pick up movement through glass, thin partitions or walls. Reduce the sensitivity.
Fault finding

6
Advanced programming
Parameter Name Default Value Range / Options Description
Detector Parameters
Walk Test LED Off On or Off When set to On this causes a red LED to flash on the sensor when it detects
movement. Use this feature to check for adequate sensitivity levels. 
Time Out
(Time adjustment)
20 minutes 0-99 minutes Once the detector is turned on, this value sets how long the lights will stay on once
movement has ceased. Select 0 for 10 second delay –use for commissioning only. 
Manual Time Out 10 minutes 0-99 minutes When a manual operation occurs, either via the switch input or the infrared, it
invokes the timeout period.
Example 1: a detector in presence mode has a detector timeout of 15 minutes and
a manual timeout of 3 minutes. When the user leaves the room they press the off
button. The sensor will revert to automatic after 3 minutes, and then walking back
in the room will turn the lights on.
Example 2: using the settings above, the user turns the lights off (say for a
presentation) but stays in the room. Every time a movement is detected, the
manual timeout period is re-triggered, but when it doesn’t pick up for the short
timeout period, the sensor will timeout and revert to automatic. This means the
lights may turn on inadvertently during the presentation, if the occupants are still
for the manual timeout period, so adjust the timing carefully.

Sensitivity On 9 1 (min) to 9 (max) Sensitivity level for detecting movement when the detector is already on. *UHS5
sets Sensitivity On and Off to the same value. *
Sensitivity Off 9 1 (min) to 9 (max) Sensitivity level for detecting movement when the detector is off. *UHS5 sets
Sensitivity On and Off to the same value. *
Lux time 0 0 (disabled)
1-99 minutes
If the detector measures the lux level and decides that the output needs switching
on or off as a consequence, the lux time must elapse first. If at any time during the
timed delay the lux change reverses then the process is cancelled. Lux Time
enables absence detection to be implemented with a lux off level set. When the
button is pressed, the lights will go on, regardless of ambient light level. However,
if there is sufficient ambient light, they will turn off again after the Lux Time. Note
that whenever the an external switch is pressed, whether in absence or presence
mode, if the lights were out because of the lux level, they will be immediately
turned on again for at least the Lux Time.

Power Up State On On or Off Select No for a 30 second delay on start up. If Yes is selected, there will be no
delay on start up and the detector will always power up detecting. 
Disable Detector N Y or N Disables detection, leaving the relay output permanently off with the dimming
output operational. This mode is used when the unit is for maintained illuminance
only.

Inhibit 4 seconds 1 to 99 seconds When the detector turns off, a delay is instigated to prevent retriggering. In certain
circumstances this delay may not be enough. This parameter allows the delay to
be changed.

Factory default - - Restores factory default settings 
User Modes
Override On - - If the lights are off, sending the IR command will turn them on immediately and
revert to automatic operation using the manual timeout period . 
Override Off - - If the lights are on, sending the IR command will turn them off immediately. After
the manual timeout period (described above), the sensor will revert to automatic. 
Cancel - - Cancels the on or off override, returning the detector to normal operation. 
Switching functions
Detection Mode Presence Presence or
Absence
Presence mode allows the output to turn on when movement is detected and off
when movement ceases. Absence mode allows the output to turn off when
movement ceases, but must be manually turned on first.

Lux on level
(Switch level on)
9 1 to 9
For a higher
resolution a scale
of 101-199 is
available
Sets a minimum light level below which the microwave sensor is enabled, allowing
lights to be turned on by movement.
Note: the Lux Level Off value must always be greater than the Lux Level On value.

Lux off level
(Switch level off)
9 1 to 9
For a higher
resolution a scale
of 101-199 is
available
Sets a maximum light level above which the microwave sensor is disabled,
preventing lights from being turned on by movement. 
Switch Input Modes
1 position switch
together
Default - Short press on, long press off. 
2 position switch
together - - Short press on, short press off. 

7
This page intentionally left blank

8
Technical data
Part numbers
FM 45789 EMS 534520
IMPORTANT NOTICE!
This device should be installed by a qualified electrician in
accordance with the latest edition of the IEE Wiring
Regulations and any applicable Building Regulations.
796-2053
796-2081
Part number Description
Detector 796-2053 Ceiling microwave presence detector
Accessories 796-2081 Surface mounting box
796-2097 Programming IR handset
The allowable frequency of operation of this product is different depending on region. Please select the correct order
code using the table below.
Suffix Region Frequency
blank UK, China, India, Middle East, Malaysia, Hong Kong, Singapore 10.587GHz
-R2 Australia and all of Europe except: UK, France, Portugal, Germany, Switzerland, Austria, Slovak Republic, Republic of Ireland 10.525GHz
-R3 France, Portugal, Switzerland 9.900GHz
-R4 Germany, Austria, Slovak Republic 9.350GHz
-R5 Republic of Ireland 10.41GHz
Dimensions See diagrams opposite
Weight 0.15kg
Supply Voltage 230VAC +/- 10%
Frequency 50Hz
Maximum Load 10A of lighting and/or ventilation
including incandescent, fluorescent,
compact fluorescent, low voltage (by
switching the primary of transformer).
Power consumption On 1500mW, Off 910mW
Terminal Capacity 2.5mm2
Temperature -10ºC to 50ºC
Humidity 5 to 95% non-condensing
Material (casing) Flame retardant ABS and PC/ABS
Classifications Insulation Class II
Purpose Sensing control
Construction Independently mounted
control for flush
mounting.
Type of action Type 1.B action
(micro disconnection).
Pollution Degree 2
Software Class A
Rated impulse voltage, 4000V
Safety The microwave radiation emitted by
these units is extremely low power and
complies with ANSI standard
“IEEEC95.1-1999 Standard for Safety
Levels with Respect to Human
Exposure to Radio Frequency
Electromagnetic Fields 3kHz 300GHz.”
IP rating IP40
Compliance EMC-2004/108/EC
LVD-2006/95/EC
Microwave frequency compatibility