MBZ-00001-01
Installation Guidelines
31
Copyright © 2004 Tait Electronics Ltd
November 2004
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.
Use the following information to calculate the maximum output current:
It is estimated that the average life expectancy of this unit will double with every 10°C
reduction in ambient temperature.
Output Voltage
Maximum Output Current
13.8V
DC
30A x derating factor
Adjusted
414W x derating factor ÷ by output voltage
T809-10 Derating Curves
Load
(%)
Ambient Temp (
)
°
C
7
40
42
44
46
48
50
52
54
56
58
60
62
64
100Vac
110Vac
120Vac
130Vac
150Vac
230Vac
50
53
5
60
63
67
70
73
77
80
83
87
90
93
97
100
Summary of Contents for T809-10
Page 12: ...12 General Information MBZ 00001 01 November 2004 Copyright 2004 Tait Electronics Ltd ...
Page 36: ...36 Troubleshooting MBZ 00001 01 November 2004 Copyright 2004 Tait Electronics Ltd ...
Page 41: ...MBZ 00001 01 Service Information 41 Copyright 2004 Tait Electronics Ltd November 2004 ...
