EasyManuals Logo

HP A Series User Manual

HP A Series
68 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #10 background imageLoading...
Page #10 background image
3-1
TURN-ON
CHECKOUT
PROCEDURE
3-2
The
following
checkout
procedure
describes
the
use
of
the
voltage
control
and
ensures
that
the
supply
is
operational.
a.
Before
connecting
input
power
to
unit,
connect
external
voltmeter
across
+S
and
—S
terminals
at
rear
terminal
board.
b.
Connect
unit
to
input
power
source
using
AC,
ACC.
and
ground
terminals
at
rear.
(Use
proper
wire
size
in
accordance
with
the
input
AC
current
rating.)
c.
Observe
output
voltage
of
supply
on
external
meter.
Output
is
factory
set
to
nominal
voltage.
If
de¬
sired.
VOLTAGE
ADJUST
(screwdriver
control,
ac¬
cessible
through
cutout
on
front
panel)
potentiometer
can
be
used
to
set
output
to
any
voltage
within
adjust¬
ment
span
(±0.5
V
or
±5%
as
applicable).
NOTE
The
current
limit
may
require
readjust¬
ment
if
the
output
voltage
is
set
away
from
nominai.
Refer
to
Paragraph
3-8.
d.
To
verify
operation
of
current
limit
circuit,
remove
voltmeter
and
disconnect
input
power.
Connect
short
across
output
terminals
of
supply
and
reconnect
input
power.
Using
clip-on
milliammeter
(HP
Model
428B,
or
equivalent)
observe
that
short
circuit
output
current
is
approxi
mately
3%
to
15%
of
rated
output
current.
e.
Remove
short
and
milliammeter.
Before
con¬
necting
actual
load
to
supply,
read
the
following
para¬
graphs.
3-3
OPERATION
3-4
The
supply
can
be
operated
in
one
of
two
oper¬
ating
modes;
normal
or
remote
sensing.
Auto-Series,
Auto-Parallel,
Auto-Tracking
and
remote
programming
operation
are
not
feasible
with
this
supply.
The
follow¬
ing
paragraphs
describe
both
of
those
modes
plus
supplementary
operating
information.
More
theoreti¬
cal
descriptions
regarding
the
operational
features
of
power
supplies
in
general
are
given
in
application
note
90A,
DC
Power
Supply
Handbook
(available
at
no
charge
from
your
local
HP
sales
office).
3-5
Normal
Operating
Mode
3-6
The
power
supply
is
shipped
with
the
rear
term¬
inal
straps
connected
for
Constant
Voltage/Current
Limiting,
local
sensing,
operation.
This
strapping
pattern
is
illustrated
in
Figure
3-1.
Before
connecting
a
load
to
the
supply,
check
the
rear
terminals
to
ensure
that
the
connections
are
correct
and
that
the
connect¬
ing
straps
are
tightened
securely.
3-7
Current
Limit
3-8
Figure
3-2
shows
typical
current
limiting
charac¬
teristics
for
all
HP
modular
supplies.
As
indicated
on
the
drawing,
the
current
limit
point
varies
in
accord¬
ance
with
the
output
voltage.
As
received
from
the
factory,
the
initial
current
limit
point
is
set
to
104
±1
%
of
the
current
rating
with
the
output
voltage
at
its
nominal
value.
This
same
current
limit
setting
is
recom¬
mended
for
ail
output
voltages
within
the
adjustment
span
because:
(1)
the
current
limit
crossover
point
must
be
at
least
3%
higher
than
the
maximum
expected
operating
current
to
prevent
performance
degradation;
and
(2)
a
current
limit
setting
of
higher
than
105%
of
rating
creates
the
possibility
of
excessive
internal
heat¬
ing
as
specified
in
the
caution
note
of
Figure
3-2.
Hence,
the
current
limit
potentiometer
(accessible
through
a

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the HP A Series and is the answer not in the manual?

HP A Series Specifications

General IconGeneral
ModelHP A Series
CategoryPower Supply
Input Voltage100-240V AC
Input Frequency50/60 Hz
CoolingFan
ConnectorsSATA, Molex
Efficiency80% or higher (80 Plus Certified)

Related product manuals