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Power system troubleshooting, Power system troubleshooting -12, Figure 4–2 – Paradyne Jetstream CPX-1000 User Manual

Page 112

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4. Troubleshooting

1000-A2-GN22-00

4-12

February 2003

Power System
Troubleshooting

The CPX requires

−48V power from a plant battery source. Two

−48Vdc inputs (A and B) are wired to the CPX, so that if one input
to the system fails, the other maintains power. Input A delivers
power to the left and center power supply modules; Input B
delivers power to the center and right power supply modules.

The CPX has three load-sharing power supplies, which deliver dc
voltage to all of the plug-in modules. A circuit breaker located on
the CPX rear panel, provides equipment electrical protection
(

Figure 4–2

).

Figure 4–2. Power Panel and Circuit Breaker

After you apply power to the CPX, if none of its front panel
indicators light, and if its internal fans are not working, refer to

Table 4–9

for troubleshooting instructions.

Isolate a problem to one or more modules before troubleshooting:

Step 1

After applying power, wait at least two minutes for the system to
initialize. If none of its front panel indicators light and its internal
fans are off, see Troubleshooting Instructions (

Table 4–9

).

0069

16

15

14

13

12

11

7

9

6

8

10

5

4

3

2

1

DC -48V

DC -48V
RTN

DC -48V

DC -48V
RTN

To

Plant Battery "A"

-48V R

T

N

-48V

To

Plant Battery "B"

-48V

-48V R

T

N

Plant

Battery A

Barrier Strip

Frame

Ground

Points

(requires

10-32 x 1/4"

screws)

Circuit

Breaker

Plant

Battery B

Barrier Strip

Open Protective Guards