CP Electronics MWS3A-DD 제품 설명서 - 페이지 2

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2. Description and Operation

The MWS3A-DD microwave presence detector provides automatic control of lighting loads with optional

manual control. It can be used on incandescent, fluorescent and compact fluorescent lighting and DSI or

DALI digital dimming ballasts over 1 or 2 channels. The MWS3A-DD 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 MWS3A-DD has a unique adjustable sensor

head that allows the area of detection to be optimised for the application.

The dimming channel of the detector can be used to control the light output of luminaires that are fitted

with dimming ballasts. The detector measures the overall light level in the detection area and calculates

the correct output for the luminaires, to achieve a preset lux level (maintained illuminance).

The switching channel of the detector can either be used to isolate the supply to the dimming ballasts

(saving on the standby current of the ballasts) or to switch a separate channel of standard, non-dimming

luminaires.

Two input terminals can be used to manually override the dimming levels and override the lights on or off.

The flexibility of having two channels and two switch inputs allows the following example scenarios:

Dim an outside row of luminaires whilst internal fittings are switched

Provide absence detection (see below) for two separate channels

Maintained illuminance system with manual up/down controls

An integral infra-red sensor in the unit allows the unit to be programmed using the optional DD-LCDHS

programming handset. This gives complete flexibility over many of the operating parameters. Without the

handset, manual adjustments can be made to the sensitivity, lux and time settings using controls

accessible behind the lens.

The UHS user handset can be used to change output lux levels and override the lights on or off.

Two standard units are available:

MWS3A-DD - presence detection:

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.

MWS3A-DD/ABS - absence detection:

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. Note that the MWS3A-DD can be programmed to

absence detection using the programming handset.

In most applications the MWS3A-DD can be used with simple manual adjustment. However, the MWS3A-

DD unit has a comprehensive set of features that can be set using the DD-LCDHS handset. Alternatively

the units can be commissioned as follows:



On-site commissioning service - please contact our sales department for details.



Pre-commissioning service - the units will be despatched to site with the correct features set. The

part number will read MWS3A-DD/PRG followed by the project reference number. Please contact

our sales department for details.

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