SYSTEM RACK

4.1.3 TWO SHELF POWER SUPPLY

The Power Supply has a 115/230V AC 50/60 Hz input and 4 continuous duty outputs as follows:

+5V DC 24A. -5V DC 6A. +12V DC 3A. -12V DC 5A.

The power supply can handle 2-shelves and has the following connections:

4 separate +5V 2A connections.

2 separate -5V connections.

2 separate +12V connections.

2 separate -12V connections.

6 separate ground connections.

4.1.4 POWER SUPPLY REDUNDANT PLATE

The power supply drawer can be made redundant by the use of the redundant diode plate (PN 023- 3039-553). The redundant plate allows two power supply drawers to share the load via diodes. One of the power supply drawers may be removed and the remaining drawer will supply the full load. (See Figure 4-10.)

Table 4-2 POWER SUPPLY CONNECTIONS

TB1

Wire

Color

From

 

No.

 

 

Term 1

W1

Blk

AC (Hot)

Line

Term 2

W1

Wht

AC (Ntrl)

Line

Term 3

W1

Grn

AC (Gnd)

Line

TB2

 

 

 

 

 

 

 

 

 

Term 1

W1

Red

+5V

F1

Term 2

W2

Red

+5V

F1

Term 3

W6

Blu

Gnd

Gnd

Term 4

NC

Blu

Gnd

Gnd

Term 5

W7

Term 6

W4

Blu

+12V

F3

Term 7

W5

Wht

-12V

F4

Term 8

W3

Grn

-5V

F2

Term 9

W8

Blu

Gnd

Gnd

4.1.5 VOLTAGE ADJUSTMENTS

See Figure 4-10for location of components and Table 4-2for wire connections.

1.Connect a voltmeter to U1, pin 76 on an RVM (DO NOT use an extender card).

2.Adjust the +5V pot on the power supply for a reading of 5.1V.

3.If +5.1V cannot be obtained, change R84 to a 5.6k ohm 1/4W resistor.

4.1.6 REDUNDANT SUPPLY ADJUSTMENTS

See Figure 4-10for location of components and Table 4-2for wire connections.

1.Remove the AC voltage to one of the supplies.

2.Connect a voltmeter to U1, pin 76 on an RVM (DO NOT use an extender card).

3.Adjust the +5V pot for a reading of 5.1V. (If +5.1V cannot be obtained, change R84 to a 5.1k ohm 1/4W resistor.)

4.Connect a voltmeter to output of CR3 and verify that the -5V line is -4.8V to -5.2V. (If not, make R68 lower to raise voltage.)

5.Remove the AC voltage to the adjusted supply and connect AC voltage to the other power supply.

6.Connect a voltmeter to U1, pin 76 on an RVM (DO NOT use an extender card).

7.Adjust the +5V pot for a reading of 5.1V. (If +5.1V cannot be obtained, change R84 to a 5.1k ohm 1/4W resistor.)

8.Connect a voltmeter to output of CR3 and verify that the -5V line is -4.8V to -5.2V. (If not, make R68 lower to raise voltage.)

4.1.7 VERIFY FAN AIR FLOW DIRECTION

1. Connect the power cables to a 110V AC source.

4-2