CP Electronics MWS3A-DD Посібник з експлуатації - Сторінка 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:
1.
Dim an outside row of luminaires whilst internal fittings are switched
2.
Provide absence detection (see below) for two separate channels
3.
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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