8
VDO Dotron User Manual
Generic 48 VDC external PSU safety limits
If you supply a chain of VDO Dotron dots with DC power from a
48 VDC external PSU (power supply unit)
that is not manufactured by Martin®
, you must not exceed the
maximum power rating of the output
from the PSU
or
40 VDO Dotron dots
, whichever limit you reach first
.
Follow these instructions:
• Allow a power consumption of
5 watts per dot
. Calculate the total power consumption in watts of the dots
in each chain you plan to create. Do not create a chain that will exceed the
maximum power rating of
the PSU output
used to supply that chain with power. Each time the total power consumption in watts for
one chain reaches the PSU output’s maximum power rating, you must create a new chain of dots that is
connected to a new 48 VDC power output. For example, if the PSU output is rated 100 W, do not connect
more than 20 VDO Dotron dots to that output.
• Even if the maximum power rating of the PSU output is higher than 195 W, do not connect more than
40
VDO Dotron dots maximum per DC output
of the 48 VDC external PSU.
• This means that, each time you reach (a) the maximum total length of 40 fixtures in one chain, or (b) 50 m
(164 ft.) total length of the chain, or (c) the PSU output’s maximum power rating
– whichever you reach
first –
you must create a new chain of fixtures that is connected to a new 48 VDC power output
PROTECTION FROM BURNS AND FIRE
• The VDO Dotron is cooled by convection. Provide free airflow and a minimum clearance of 10 mm (0.4
in.) around the product.
• Do not operate the VDO Dotron if the ambient temperature (Ta) exceeds 55° C (131° F).
• The surface of the product can become hot when in use. Take precautions to avoid accidental skin
contact.
• Do not modify the VDO Dotron in any way not described in this manual or install other than genuine
Martin® parts. Use only accessories approved by Martin®.
PROTECTION FROM INJURY
• Read carefully the chapter “Physical installation” on page 12 and respect the limits and instructions given
in that chapter.
• Ensure that the installation hardware and supporting surface or structure can hold at least 10 times the
weight of all the devices they support.
• Block access below the work area and work from a stable platform whenever installing, servicing or
moving the VDO Dotron.
• Make sure that all items are securely installed, taking into consideration all possible environmental
conditions including temperature variation and wind. Make sure that it is impossible for items to fall and
cause injury or damage.
• Use grade 8.8 (or equivalent strength) fasteners that are suitable for their purpose and for the installation
environment.
• Fasten VDO Dotron products to the supporting surface or structure with a minimum of two fasteners
(screws, bolts, etc.) per product.
• Either use self-locking nuts or use lockwashers with standard nuts on all machine screws and bolts.
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