SYSTEM RACK

Table 4-7 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

4.2.5 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.

4.2.6 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.)

4.2.7 VERIFY FAN AIR FLOW DIRECTION

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

2.Connect the Plus lead of the Fan Cable to Bus Bar D1-16.

3.Verify both power supplies are turned OFF. (Power Supply "A", is located on the left side at the bottom of the rack. Power Supply "B" is located on the right side at the bottom of the rack.)

4.Install both power supplies.

5.Turn Power Supply "A" on.

6.Verify that the Power On indicator is "ON" for Power Supply "A".

7.Verify that the air flow from the fan is to the outside.

4.2.8VERIFY VOLTAGES ON POWER DISTRI- BUTION CABLE

1.Verify voltages in Table 4-13for the Power Termi- nation Cables for Shelves 1-6.

2.Turn Power Supply “A” OFF.

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