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RACK MOUNTING
The main frame of the Incremental Power
System is designed for installation
in a
standard 19-inch equipment rack
.
Vertical
space required for mounting
is
7" for each
main frame.
1. Remove four screws that secure the
front panel. Open and lower front panel
as shown in Figure 5.
2. Install main frame in equipment rack,
using appropriate four screws supplied.
,------CAUTION------
While positioning
the
main frame in
the equipment rack, do not use
t
he
large filter capacitors as handles. Lift
or handle only by the chassis
and
power transformer
.
3. After installing all modules, close front
panel and secure with four screws pre-
viously removed.
SHELF MOUNTING
In handling
the
main frame for shelf
mount-
ing, be sure to observe the CAUTION of
Step 2,
in
RACK MOUNTING. Four
rubber
feet with attaching screws are supplied with
each main frame. Position the main
frame
on one side and attach the feet
to
the
under-
side of the chassis.
MODULE INSTALLATION
The input, driver, and power modules
are
in-
stalled in the main frame according
to
the
functional locations of Figure
5.
The ac
primary power module is installed in each
main frame shipped from the factory. Re-
maining modules must be unpacked and in-
stalled in the main frame as follows:
1. Remove four screws that secure the
front panel. Open and lower front panel
as shown in Figure 5.
DRIVER MODULE NO. 1
DRIVER MODULE NO. 2
•
1
2. Guide
channels
align and support each
card
module,
which plugs into a con-
nector
at the
rear of the main frame.
Insert
each
module so that the card
edges
fit into the
flanged portion of the
top
and bottom
guides. Gently push
the
card
module
into the guides until it en-
gages
the rear
connector. Press firmly
until
fully
seated.
,-------
CAUTION------
Do not
insert
or remove any driver
card
module
from the main frame
when
primary
ac power is applied.
3. After
all
modules are
installed
(and all
driver
module
switch matrices are set up
correctly),
close the front panel and
secure
with
four
screws
previously
removed.
-------
NOTE-------,
When
fewer than
8 Model 2275 Power
Amplifier Modules
are installed in the
main
frame,
install modules in slots
nearest
the fan for
optimum cooling.
ELECTRICAL
120 Volt, 50/60 Hz Power
Connections
Equipment
is supplied
for domestic use with
the power
transformer
primary strapped for
120 volts.
The power
input
rating
appears at
the rear of
the main
frame chassis, adjacent
to the power
cord
(see Figure 8). Verify that
line voltage
is in
accordance with the volt-
age rating
before
connecting the Incre-
mental Power System to line power.
Alternate
50/60 Hz
Primary Power
Connections
The Incremental
Power
System may operate
from an
ac primary
power source having
100V, 120V,
200V,
220V, or 240V at 50160 Hz.
As shipped
from
the factory, the power
Figure 5. Installation of Card
Modules in Main Frame
4
transformer
primary is strapped for 120
volts. The voltage rating is at the rear of the
main frame chassis,
adjacent
to the power
cord
.
Qualified service personnel may change the
transformer primary
st
raps
for the desired
operating voltage. The primary power straps
are located at terminal board TB301, within
the
ac primary power module
.
To change
the straps:
1. Unplug ac cable from ac power source.
Remove ac primary power module from
main frame. Locate terminal board T8301
on the card module (Figure 6).
2. Remove three 120-volt straps from ter-
minals 2 to 3, 6 to 7, and 8 to 9.
3. See Figure 6 to connect
necessary
straps to proper term inals for the desired
operating voltage.
4. From accessory kit supplied with main
frame, select corresponding voltage rat-
ing sticker
.
Peel st
icker
from backing
and affix new voltage rating over 120V
designation at rear of
main
frame.
5. Install ac primary power module in main
frame
.
Conversion for 8-Ohm Load Impedance
All Incremental Power Systems are shipped
from the factory with
internal
wiring con-
nected for 16 ohms load impedance. The
systems may be altered by qualified per-
sonnel for 8 ohms load impedance. Appro-
priate alterations
must be made at the
main frame and every Model 2275 Power
Amplifier
Module used in the modified
main frame
.
To accomplish
the 8-ohm
conversion,
TB301
100V _
120V _
200V_
220V _
240V_
STRAPS
INSTALLE
D
FOR
120-VOLT OPERATI
ON
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ACSWITCH
Figure
6.
AC Primary Power Module and
Alternate 50160 Hz Power Connections
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