dCS 904 User Manual

Manual for Software Version 1.5x and 1.36

dCS Ltd

June 2000

 

 

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.

Excess temperature (deg C)

dCS 9xx EXCESS TEMPERATURE

(Measured as dCS 954)

Middle unit of 3, in box with "shelf plates"

45

40

35

30

25

20

0

1

2

3

4

5

6

7

8

9

Unit spacing (cms)

Figure 34 – Temperature rise above ambient for a unit in a stack of 3 with poor

ventilation

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