AC
POWER
The
power transformer
can be
strapped for I
15 volt
or
230 volt 50
or
60Hz
AC
operation.
If
the
unit was ordered for
230 volts,
a tag
on the power
cord
warns
of
the modification.
The two primary windings of
the power
transformer are connected in paral lei for
115
volt operation, and
in series for 230 volt operation. (See the Schematic
Diagram
at the
back
of
this manual.)
To
strap the
power transformer for a
different
voltage,
remove
the top cover
of
the 622. Strapping
instructions are found on the insulating fishpaper around the
power tranformer.
It
is
not
necessary
to rearrange the heavy
insulated
wiring;
all
strapping
can
be performed
with bare jumper wire. Take care not to burn the
insulation.
The power cord is terminated in a
"U-Ground"
plug
to
USA
standards.
The
green
(or
green/yellow) wire (which is
connected to the long prong) is connected directly
to the
622
chassis.
If
it becomes necessary to lift
this ground
to suppress ground
loops, this should
be
done
with
a three-prong to
two-prong
adapter plug, rather
than
by
damaging
the power plug.
It is not recommended
that this ground be
defeated unless absolutely necessary because it eliminates the intrinsic safety
feature
of the three-wire system.
WARNING!
IF
THE GROUND
IS DEFEATED, CERTAIN FAULT CONDITIONS
IN
THE
UNIT OR THE SYSTEM TO
WHICH IT
IS CONNECTED CAN
RESULT
IN APPEARANCE OF FULL LINE VOLTAGE BETWEEN
CHASSIS AND
EARTH GROUND. SUCH VOLTAGE
IS CAPABLE OF
CAUSING SEVERE
INJURY OR
DEATH!
MECHANICAL
Vertical space of
two standard
rack units
(3
l/2"/8.9cm) is required.
INSTALLATION
Mounting the unit directly
over
large
heat -producing devices like a
vacuum-tube
power amplifier may
shorten component
life and
is
not recommended. Ambient
temperature should not
exceed
1
13 degrees
F
(45
degrees
C)
when equipment is
powered.
Balanced
Output Transformer
Installation:
If
transformers were
not
installed at
the factory,
refer to
the installation
instructions furnished with the transformer
retrofit kit, available directly
from Orban. The transformers supplied
with this kit
have been designed to
have
a
negligible effect on
published specifications. Should
you
wish to
use
some other
transformers, it would be wise to
make careful
performance
measurements
with special attention to
LF
distortion and
HF
response
at high output levels,
thus
determining the
output
level
achievable with
performance
acceptable for your
application.
A
transformer
meeting Orban
standards should produce
approximately
+20dBm (limited
by
clipping in the output
amplifier) without
significantly compromising
performance.
The
Electrical Installation
section describes grounding procedures
in the event
transformers
are used.
3
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