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DEC VT220 - Page 189

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Table
9-1
Input
Voltage
Specifications
(Cont)
Voltage
230
Vac
Specification
Transients
Nominal
voltage
Minimum
voltage
Maximum
voltage
Input
line
current
Line
frequency
Power
factor
Inrush
current
Peak
inrush
Input
power
Efficiency
Undervoltage
Overvoltage
Transients
Value
Low
energy
transient
of
300
V
peak
spike
with
no
more
than
0.2
watt-seconds
of
energy
per
spike;
High
energy
transient
of
1
kV
peak
spike
with
no
more
than
2.5
watt-seconds
of
energy
per
spike.
220
Vac-240
Vac
174
V
rms
268
V
rms
0.511.
rms
(max.)
47-63
Hz
(watts)
--
(rms
V X
rms
A)
>
0.55
Surge
current
at
first
application
of
input
voltage
may
be
reached
for
1/2
cycle
of
input
line,
with
repetitive
peaks
of
exponentially
decaying
amplitude
for
up
to
10
more
cycles.
25
A
(Thermisters
cold)
120
watts
(max.)
at
full
rated
dc
output
load
of
77
watts.
0.65
(min.)
output
power
to
input
power
ratio.
Provides
minimum
of
5
millisecond
hold-up
at
180
V
rms
during
power
outage.
300
Vac
for
1
second
(max.)
Low
energy
transient
of
300
V
peak
spike
with
no
more
than
0.2
watt-seconds
of
energy
per
spike;
High
energy
transient
of
1 kV
peak
spike
with
no
more
than
2.5
watt-seconds
of
energy
per
spike.
9.2.2.1
+12
V
Start
Up
Circuit
--
The
+12
V
start
up
circuit
(Figure
9-5)
consists
of
the
following
components/circuits.
•
AC
input
transformer
(T592)
•
Rectifier
(ES0l)
•
Filter
capacitors
(C501
and
CS02)
•
+12
V
regulator
components
(E592,
0591,
and
0502)
The
+12
V
start
up
potential
provides
an
operational
potential
for
the
comparator
within
the
overcurrent
protect
circuit.
The
+12
V
start
up
potential
is
also
supplied
to
the
pulse
width
modulator
where
it
provides
initial
power
for
operation
of
this
circuit
until
the
+12
V
dc
circuit
is
operational.
9-6

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