KEPCO RA 76 User Manual

INSTRUCTION SHEET

KEPCO

An ISO 9001 Company.

RA 75
RA 76

MODEL RA 75, RA 76

RACK ADAPTER

1. DESCRIPTION

The Kepco RA 75 (Figure 1) and RA 76 (Figure 2) Rack Adapters are specifically designed for the installation of Kepco
FAW Series Power Supplies into 19-inch EIA standard equipment racks. Each Rack Adapter accommodates from one to
three FAW power supplies. The RA 75 Rack Adapter accommodates FAW 50W and 100W models; it occupies 1U, 1.75
inches (44.5 mm) of vertical space in the standard 19 inch (482.6 mm) equipment rack, and has a maximum depth protru­sion of 16.0 inches (406.4mm) as measured from the mounting surface of the front panel (see outline drawing, Figure 7).
The RA 76 Rack Adapter is identical, except that it occupies 2U, 3.5 inches (89 mm) of vertical space to accomodate FAW
150W as well as 50W and 100W models (see outline drawing, Figure 8). Table 1 lists equipment supplied.

FIGURE 1. RA 75 RACK ADAPTER FIGURE 2. RA 76 RACK ADAPTER

TABLE 1. EQUIPMENT SUPPLIED WITH RA 75 AND RA 76 RACK ADAPTER

DESCRIPTION FUNCTION KEPCO PART NO. QTY

Line Cord Connect A-C input power 118-0647 1

Multi terminal Jumper Strip

Two-terminal Sense Link

Resistor

Screw (4-40 x 3/8, ST, FLSO) Mount FAW power supplies 101-0237 15

* Quantity of 0.1 means 1/10 of 110-terminal Jumper Strip, equivalent to 12 terminals. Cut as needed.

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL [phone] " FAX [phone]

http://www.kepcopower.com " email: [e-mail]

©2003, KEPCO, INC
Data subject to change without notice 228-1439 REV 1

Connect a-c power distribu­tion (TB2) terminals

Connect sense and output ter­minals (TB1)

Limit current through CB1 indi­cator (see Fig. 6)

172-0394 0.1*

172-0300 6

115-1127 1

1

The front panel (Figure 3) is equipped with a 7.5A Input power circuit breaker that can be used to enable input power
to the FAW power supplies. Three front panel pilot lights can be wired to indicate whether the associated FAW power
supply is on. Front panel Test Points (+ and –) can also be wired so that the DC output voltages are accessible for
monitoring from the front panel.

RA 75

RA 76

POWER

TEST POINTS

+

−

3

21

+

+

−

PILOT

−
32

1

FIGURE 3. FRONT PANEL

The rear panel (Figure 4) includes a 15-terminal terminal block that can be used to make the FAW power supply out­puts accessible and an a-c inlet connector. A separate 115V a-c line cord is included with the rack adapter.

RA 75

2

RA 76

FIGURE 4. REAR PANEL

228-1439 REV 1 6/20/03

1. INSTALLATION

The Rack Adapter is equipped with handles; while installation is proceeding, the Rack Adapter must be supported
from below until it has been secured. The Rack Adapter can also be fitted with optional slides (see Figure 7).

1. To activate the front panel pilot lights, the pilot light resistors must be configured to match the FAW output volt­age prior to installing the power supplies. The front panel must be partially disassembled to facilitate the inser­tion of resistors matched to the associated power supply output voltage. Figure 6 illustrates the schematic.
Figure 5 illustrates component location. Proceed as follows:

a. Remove the top cover of the rack adapter by removing screws from the top (six for RA 75 and nine for RA

76) and one from the top center of the front panel above Test Point 1 (–).

b. Separate the front panel from the chassis by removing 5 screws from the front panel, then disassemble

the PCB assembly (see Figure 5) by removing two 6-32 X 1/4 ACF. ST. nuts (P/N 102-0004), associated
washers (P/N 103-0015) and spacers (P/N 104-0227).

FIGURE 5. FRONT PANEL DISASSEMBLY FOR INSERTION OF PILOT LIGHT RESISTORS

6/20/03 228-1439 REV 1

3