Paradyne CPX-1000 manual Power System Troubleshooting, 9for troubleshooting instructions

4. Troubleshooting 1000-A2-GN22-00

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).

Open Protective Guards

16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
DC -48V											DC -48V
DC -48V											DC -48V
RTN											RTN

-48V RTN -48V

To

Plant Battery "A"

Frame	Plant	Circuit
Ground	Battery A	Breaker
Points	Barrier Strip
(requires
10-32 x 1/4"
screws)

0069

Plant	- -
	48V	48V
Battery B
	RTN
Barrier Strip

To

Plant Battery "B"

	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 4–9for 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).

4-12 February 2003