FP3000 RAID
USER'S
MANUAL
5
CROSS T.E.C
www.crossups.com
2.2.4.
Output
Transformer
The
primary
lead
shall
be
connected
to
inverter
and
the
secondary
to
output
in
this
isolation
transformer.
It
is
specially
designed
to
contain
the
reactance
and
partially
serves
as
output
filter.
Also,
it
minimizes
the
current
harmonics,
and
maximizes
efficiency.
The
input
and
output
voltage
and
frequency
are
synchronized
by
phase
lock
loop
oscillator.
The
synchronized
transfer
units
are
placed
at
the
bypass
line
and
at
the
inverter
section.
2.2.5.
Static
Switch
This
unit
operates
as
an
automatic
transfer
device
between
inverter
and
bypass
feed.
At
the
moment
of
detection
of
any
abnormal
operation
in
inverter
or
over-load
condition,
the
static
switch
will
simultaneously
transfer
the
power
supply
to
bypass
feed
(commercial
power),
not
to
interrupt
the
load
operation.
When
the
inverter
operation
returns
to
normal,
the
static
switch
will
then
retransfer
supply
line
to
inverter,
again
without
any
interruption.
In
order
to
avoid
the
possible
rush
current
evolved
from
the
phase
difference,
this
unit
is
constituted
with
only
semi-conductors.
2.2.6.
Control
Circuitry
This
unit
consists
of
inverter
control,
alarming
circuit,
static
switch
control,
and
etc.
It
is
designed
to
operate
though
the
internal
unexpected
voltage
transient
intervenes.
Its
power
comes
from
the
battery
by
DC/DC
converter,
and
thus,
power
outage
or
start-up
peak
current
would
not
affect
the
control
circuitry
operation.
