Occupancy Signal; How To Use The Combination Of Occuswitch Dali And Gateways; Cascading Dali Network; Occuswitch Dali - Philips OccuSwitch DALI LRM2070 User Manual

5 .4 .2

Occupancy signal

The gateway will translate the occupancy control signal
as used between the OSD units itself to the BMS system .
In this way the occupancy sensor of the OSD can be used
to control HVAC, sun blinds, security, etc . For the LON
interface this is done with the standard LONmark profile
for occupancy sensors . For BACnet the object is described
in the usual way by the object description in the gateway .
Up to 16 groups can be used .
5 .4 .3 How to use the combination of OccuSwitch DALI
and gateways?
This part of the manual is designed for engineers
with sufficient knowledge on DALI, gateways, and the
communication protocol used in the BMS system (either
BACnet, KNX or LON(mark) .
5 .4 .4

Cascading DALI network

The OccuSwitch DALI (OSD) uses 2 DALI networks, one
for the luminaires (fittings) plus sensors and push button
interfaces, the other to link the OSDs to each other and
via a gateway to the BMS . These networks have no logic
connection and work independent from each other .
B Warning
Although logical separated, the two networks are
electrically connected to each other . This means that
the DALI network to the gateway is connected to the
luminaires as well . Most drivers in the luminaires only
offer basic isolation . Therefore all DALI wiring must
be treated as mains wiring, with the right isolation in
place . One advantage; you are allowed to use the DALI
and mains wiring in one cable, cable duct, junction
box, etc . The DALI signal is ELV (or PELV) but not S(ave)
ELV .
Advantages of a cascading DALI network
One of the main advantages of the cascading network
is the separation of the control and management
information . Per control circuit one DALI network is used .
DALI is rather slow, and will only support up to 4 control
circuits before the communication with clutter . You need
to take care on this in a traditional DALI system . With this
solution this will never happen .
5 .4 .5

OccuSwitch DALI

Install the OccuSwitch DALI (OSD) as indicated in the OSD
documentation as usual (zie OSD documentation) . The
DA connection should be used for the luminaires, the X
connection is for the interlinking and the gateway .
Commission the OSD as needed, set the desired mode,
calibrate the light sensor and commission the luminaires to
the right function .
Optional you can already set the DALI group the OSD
should work in . This is a very convenient method . If you
have a plan, select the OSD and set its group address . You
can do this from the gateway, but the gateway will use a
search method, it will select one of the OSDs and ask you
to give the corresponding address . This will lead you at
random through the floor or building .
Apart from giving DALI group addresses via the gateway,
you can also use the IRT9090 as described in paragraph
5 .8 .
When the OSD is commissioned it can be connected to the
gateway .
B Warning
Disabling DALI system failure
The OSD is working according to the DALI (#101 and
#102) specification . This means that the OSD will react
if there is no DALI power on the X port . The luminaires
(mounted on the DA side) will be set to 100% (the
default system failure level) . This is normally a good
measure, no DALI power means that the controller or
the bus channel is failing, the safest action than is to
switch on the lights . During installation however this
is not very convenient, since the gateway will most
likely be installed much later . Therefore the OSD will
disregard a system failure as long as it does not detect
DALI power on the X port .
If you had DALI power connected to the X port,
but disconnected it and you want the OSD to work
normally again, just remove mains power for 5
seconds . The OSD will function normally again .
OccuSwitch DALI
User Guide
Page 39