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dCS 904 User Manual Manual for Software Version 1.5x and 1.36
dCS Ltd June 2000
Manual part no: DOC135904 iss 2B2
Page 63
135904ma2b2.pdf file available from website
Contact
dCS
on + 44 1799 531 999 email to: more@dcsltd.co.uk
(inside the UK replace + 44 with 0) web site: www.dcsltd.co.uk
Operating Conditions
The dCS 904 has no ventilation slots or fan cooling. It dissipates relatively low
power, so that usually allowing natural convection provides enough cooling in
most circumstances. It is sensible, however, to not install the unit near heat
sources such as radiators, hot air ducts or in direct strong sunlight.
Operating conditions should be such that internal temperature does not exceed
70°C substantially, as read out from the internal temperature sensor (see the
menu function Heat on page 22). This will tend to be met if the ambient
temperature is below 50°C, although it will depend a bit on how the unit is
positioned. Internal temperature should not fall below 0°C, and should be a non-
condensing. The unit monitors its internal temperature, and displays one of two
error messages as the temperature rises. At and above an internal temperature
of 78°C, the unit displays Hot on its front panel, as a warning. Performance and
reliability will be degraded if operated in this range for long periods. At and
above 88°C the unit displays Ouch, and should be turned off. See section
System Messages and Error Codes on page 75.
Figure 34 below shows the rise of internal temperature for the middle unit of
three stacked as in a rack, with support plates between. Allowing 3 cms
between units gives reasonable cooling.
If in doubt, the easy test is – the dCS 904 is happy to work anywhere a human is.
dCS 9xx
EXCESS TEMPERATURE
(Measured as
dCS 954
)
Middle unit of 3, in box with "shelf plates"
20
25
30
35
40
45
0123456789
Unit spacing (cms)
Excess temperature (deg C)
Figure 34 – Temperature rise above ambient for a unit in a stack of 3 with poor
ventilation