CP Electronics MWS3A-PRM-2CHC, 2CHL - Manual (Page 3)

page 3
3. Wiring & Installation
1. Wire the products using the diagram overleaf.
2. To switch from more than one position simply wire two or more units in parallel using the Live,
Neutral and Switched Live wires only.
3. The detector should be sited so that the occupants of the room fall inside the detection pattern
shown in section 11.
4. Corridors or aisles: the unit should be placed at the end of the corridor or aisle and the sensor
head should be angled to look down the corridor or aisle.
5. Open plan areas and offices: the unit can be mounted in a corner looking outwards in which
case the sensor head should be angled . Or the unit can be mounted in the centre of the area
with the sensor head flat.
Note that the higher the sensor is installed the shorter the detection range will be.

Sites as far away as possible from any lighting or ventilation equipment.

Do not fix to a vibrating surface.

Do not fix to a suspended luminaire.

Site as far away as possible from the surface of metal objects.
7. Mount using one of the two options overleaf.
8. Use a small screwdriver to set the LUX level adjuster fully clockwise, the time to minimum (fully
anticlockwise) and the sensitivity to maximum (fully clockwise) using the diagram in section 9.
9. Power the unit up—the load should come on immediately.
10. Vacate the room or remain very still and wait for the load to switch off (should take no more than 2
minutes).
11. Check that the load switches on when movement is detected.
12. The LUX thumbwheel determines the ambient light level at which the lights turn on.
13. Select the time using the adjuster, fully clockwise is the maximum.
14. The area of detection can be varied by altering the angle of the sensor head and the sensitivity
adjuster. Note: on maximum sensitivity this unit is extremely sensitive to movement and may
detect through glass, thin walls or partitions. If this causes a problem reduce the sensitivity by
turning the adjuster anticlockwise.
15. Using the UHS or UHS3 infra-red handset: the override on button turns the unit on permanently;
the override off button turns the unit off permanently; the cancel button cancels the overrides.
When an override is selected an LED will flash inside the unit. The UHS handset can also be used
to set the lux levels—see Section 10.3
Absence detection
16.
To use absence detection a retractive (momentary) switch must be connected to the switch
terminal shown on the diagram. Note that this will be switching mains voltage.
17. 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.
18. 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 DD-LCDHS handset instead of the manual
adjusters or external switches. See section 10.