Page 154 - General_Purpose_Enclosures _Aria, APO,Polysafe

154 GENER AL PURPOSE ENCLOSURES HE AV Y DUT Y AND INDUSTRIAL ENCLOSURES

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Power dissipation values

Third read in the matrix the temperature rise in the cabinet
According to EN 62208, IEC 62208 and IEC 60890
due to the thermal power dissipation.
For each enclosures range
• The 4 or 5 different matrix tables contain all the enclosure Example of an individual enclosure PolySafe 452
Enclosure: height = 1000 mm, width = 1250 mm, depth = 320 mm.
dimensions.
• The tables are created according to the positioning Placed against the wall.
The calculated effective power loss of the components: 600W
of the enclosure.
• Two different values of temperature rise are given Components are placed in the centre of the cabinet.
In the table 'Rear against wall' (see below) read for 600W and
depending on the measuring point in the cabinet:
half way or on top. column 'Half': 40K temperature rise.
With an ambient temperature of 20 °C, the absolute tempera-
ture around the components will be approximately 20 + 40 = 60 °C
What is acceptable according to EN 62208,
IEC 62208 and IEC 60890 If the temperature is too high for the components, then
• For common electrical applications, a temperature rise of choose a larger cabinet to allow air ventilation.
50 K is generally accepted. If the rise is above 50 K, Example of coupled enclosures PolySafe 452
a larger enclosure should be chosen. More volume results in Enclosure on the left side: height 1000, width 1250 mm,
a decrease of the temperature rise.
• The absolute temperature in °C in the enclosure is the sum depth 320 mm. Enclosure in the middle: height 1000, width
1250 mm, depth 320 mm. Enclosure on the right side: height
of the ambient temperature in °C and the temperature rise 1000, width 1250 mm, depth 320 mm. Placed against the wall
in K. According to the standards, the absolute temperature
is max. 70 °C Do the same calculation as above for each individual enclo-
sure.
Find the temperature rise for the left and right side
How to use a matrix?
First choose the right matrix according to the position and the enclosure in the table 'Front, left and upperside free',
see page 162 and find ‘Half’: 42K
size of the enclosure. Find the temperature rise for the middle enclosure in the
Second calculate the effective power loss in Watt (left column). table 'Frontside and upperside free', see page 163 and find
Add 10-20% to the total effective power loss of the components ‘Half’: 44K
in order to compensate the small wiring and connections.

Rear against wall
(wall mounting) Temperature rise [Kelvin]
Dissipa- PSS 220 PSS 230 PSS 320 PSS 330 PSS 340 PSS 352 PSS 420 PSS 430 PSS 440/442 PSS 452 PSS 530 PSS 542/546
tion 500×500 500×750 750×500 750×750 750×1.000 750×1.250 1.000×500 1.000×750 1.000×1.000 1.000×1.250 1.250×750 1.250×1.000
Watt Half Top Half Top Half Top Half Top Half Top Half Top Half Top Half Top Half Top Half Top Half Top Half Top
10 4 5 4 4 4 5
20 8 9 7 7 6 8 5 6 4 5 5 7
30 11 13
40 13 16 11 13 11 14 9 11 7 9 6 7 9 13 7 9 5 7 5 6 5 8
50 16 19
60 19 22 16 18 16 19 12 16 10 12 8 10 12 18 10 13 7 10 6 8 8 11 6 8
70 21 25
80 23 28 20 23 20 24 15 20 12 16 10 12 16 22 12 16
90 26 31
100 28 33 24 27 23 29 18 23 15 19 12 14 19 27 14 19 11 14 9 12 11 16 9 13
120 32 38 28 31 27 33 21 27 22 31 17 23
140 37 44 31 35 31 38 24 31 19 24 15 19 25 35 19 26 15 19 12 16 15 21 12 16
160 41 48 35 39 34 42 27 34 27 39 21 28
180 45 53 38 43 38 46 29 38 24 30 19 23 30 43 23 31 18 23 15 19 18 25 15 20
200 49 58 42 47 41 51 32 41 33 47 25 34
220 53 63 45 51 44 55 34 44 28 35 22 27 35 50 27 37 21 27 18 23 21 30 18 24
240 48 55 47 58 37 47 38 54 29 39
260 52 58 51 62 39 51 32 40 25 31 40 58 31 42 24 31 20 26 24 34 20 27
280 42 54 43 61 33 45
300 44 57 36 45 28 35 45 65 35 47 27 35 23 29 27 38 23 30
350 50 64 40 51 32 40 51 73 40 53 30 39 26 33 31 43 25 34
400 45 57 36 44 44 59 34 44 29 37 34 48 28 38
450 49 62 39 48 48 65 37 48 32 40 38 53 31 42
500 43 53 53 71 40 53 34 44 41 58 34 46
550 46 57 44 57 37 47 45 63 37 49
600 49 61 47 61 40 51 48 67 39 53
650 53 65 50 65 42 54 51 72 42 57
700 45 57 45 60
750 48 61 47 63
800 50 64 50 67