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MBZ-00001-01
3.9
Power Supply Cooling and Derating
Although the T809-10 is a high efficiency switched mode power supply, a considerable
amount of heat is generated during normal operation. While in use, ensure that an ade-
quate flow of cooling air is able to circulate around the power supply, and that the air
intake vents on the rear and sides of the unit are not inadvertently covered.
Caution:
Do not operate this unit in a completely enclosed cabinet.
The maximum output capability of the power supply may need to be derated based on
the following conditions:
• The ambient temperature immediately around the power supply unit dur-
ing normal operation.
• The AC supply voltage.
The following chart can be used to determine the derating factor (%load x 0.01) for the
given operating conditions. The derating factor can then be used to calculate the maxi-
mum output current.
100
97
93
90
87
83
80
77
73
70
67
63
60
7
5
53
50
40
42
Use the following information to calculate the maximum output current:
Output Voltage
13.8V
DC
Adjusted
It is estimated that the average life expectancy of this unit will double with every 10°C
reduction in ambient temperature.
Copyright © 2004 Tait Electronics Ltd
T809-10 Derating Curves
100Vac
110Vac
120Vac
130Vac
150Vac
230Vac
44
46
48
50
Ambient Temp (
Maximum Output Current
30A x derating factor
414W x derating factor ÷ by output voltage
Installation Guidelines
52
54
56
58
°C
)
31
60
62
64
November 2004
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