Specifications

50
Characteristics (continued)
Advantys STB
Distributed I/O Solution 1
Phaseo Regulated Power Supplies
The ambient temperature is a determining factor which limits the power that an
electronic power supply can deliver continuously. If the temperature around the
electronic components is too high, their life will be significantly reduced. Conversely,
a power supply can deliver more than its nominal power if the ambient temperature
remains largely below the rated operating temperature.
The rated ambient temperature for Phaseo power supplies is 50 °C. Above this,
derating is necessary up to a maximum temperature of 60 °C.
The graph below shows the power P (in relation to the nominal power Pn) which the
power supply can deliver continuously, according to the ambient temperature.
Derating should be considered in extreme operating conditions:
b Intensive operation (output current permanently close to the nominal current,
combined with a high ambient temperature).
b Output voltage set above 24V (to compensate for line voltage drops, for example).
b Parallel connection to increase the total power.
In all cases, there must be adequate convection round the products to ensure easier
cooling. There must be a clear space of 50 mm above and below Phaseo power
supplies and of 15 mm at the sides.
Derating
0
0
10 20 30 40 50 60
70
20
40
50
60
80
100
120
140
P/Pn (%)
Maximum operational temperature (°C
)
General rules to be complied with
Intensive operation See derating on above graph.
Example for ABL-7RE:
v without derating, from 0 °C to 50 °C,
v derating of nominal current by 2%, per additional °C, up to 60 °C.
Rise in output
The nominal power is fixed.
Increasing the output voltage means that the current delivered must
be reduced.
Parallel connection to
increase the power
The total power is equal to the sum of the power of the power supplies
used, but the maximum ambient temperature for operation is 50 °C.
To improve heat dissipation, the power supplies must not be in
contact with each other.
Load limit
Temporary overloads
1,2 x In1,1 x In
I o
ut
U out
19 V
12
1,2 1,3 1,4 1,5 1,6 1,7 1
,8
x
In
0
10
12
14
16
18
20
T
(ms)
I out:(0...100%)
I out
P
resentation:
p
ages 46 and 47
Selection:
page 48
Associations:
page 51
References:
page 51
Dimensions:
page 51