HP A Series User Manual

3-15 For reasonable load lead lengths, remote sensing
greatly improves the performance of the supply. How¬
ever, if the load is located a considerable distance from
the supply, added precautions must be observed to
obtain satisfactory operation. Notice that the voltage
drop in the load leads subtracts directly from the avail¬
able output voltage and also reduces the amplitude of
the feedback error signals that are developed within
the unit. Because of these factors it is recommended
that the total drop in both load leads not exceed 0.5 V.
If a larger drop must be tolerated, please consult your
local HP sales engineer.
NOTE
Due to the voltage drop in the load leads,
it may be necessary to readjust the current
limit. Refer to Paragraph 3-8.
3-16. It should be noted that a problem can occur in
obtaining maximum rated output voltage (nominal
+0.5 V) from a lower voltage supply (below 10 V)
even if the total voltage drop in both load leads is
maintained at 0.5 Volt. This problem is most likely
to occur when the input ac is at low line. To counter¬
act this effect, the user can maintain the ac input at a
higher line voltage or reduce the voltage drop in the
load leads by using larger diameter wires.
3-17 SPECIAL OPERATING PRECAUTIONS
3-18 Temperature
3-19 The normal operating temperature for this supply
is from 0 to 50°C, ambient. Beyond 50°C, the output
current is linearly derated to 50% at 71 C. Additional
information on temperature is given in Section II.
NOTE
During normal operation of the supply,
the case of the unit may become hot to the
touch. This is a normal occurrence and no
cause for alarm.
3“20 Mounting Orientation
3-21 The supply should be mounted and operated in
the upright position as instructed in Section II. If the
supply must be operated in an orientation other than
upright, an adequate flow of cooling air must be main¬
tained. Contact your nearest HP sales engineer for
details.
3-3

HP A Series Specifications

General

Model	HP A Series
Category	Power Supply
Input Voltage	100-240V AC
Input Frequency	50/60 Hz
Cooling	Fan
Connectors	SATA, Molex
Efficiency	80% or higher (80 Plus Certified)