NEC nd-20292 manual Green

The voltages for each PSU can be checked individually

.1 by first turning the system AC switch ON and then the switch on each power supply ON.

250.2PSE-DD-1 PSU

NOTE: Before proceeding to install the PSE-DD-1

PSUs, ensure theInput Line Cords are not connected to the locally provided -48VDC power source and the input power switches on each PSE-DD-1 PSU are in the OFF

position. The input line cords for the PSE-DD-1 PSUS must be locally provided.

A.Remove the four mounting screws located at the top and bottom of the PSU slot, in each CCU. Place the screws aside for later reuse.

B.Install a PSE-DD-1 PSU into the PSU slot in each CCU, making sure its power switch is in the OFF position.

C.Secure the PSU with the screws removed in Step A.

D.One cable is provided with each PSE-DD-1 PSU.

This cable is a six pin connector-ended, for DC OUT power cable. Connect each DC IN power cable of each PSU to the 6 pin (54) connector

located immediately above in its CCU. (See Figure 200-34 and Figure 200-35)

ND-20292

CHAPTER 2

APRIL, 1990

GREEN

I GREEN

Figure 200-35

Figure 200-34

E.One screw terminal block provided with four screws is located on the lower front of each PSE- DD-1 PSU. Connect up to four PSE-DD-1 PSUs using locally provided cables, as shown in Figure 200-36.

Figure 200-36 Installation of PSE-DD-1

F.Connect the first PSE-DD-1, installed in the ESE-32B-1 CCU, to the output of the locally provided -48 VDC power source, using a locally provided cable.

G.1. Turn ON the locally provided -48V DC power source.

2.Turn ON the power switch on the PSE-DD-1 PSU located in the third ESE-32E-1 CCU.

3.Turn ON the power switch on the PSE-DD-1 PSU located in the second ESE-32E-1 CCU.

4.Turn ON the power switch on the PSE-DD-1 PSU located in the first ESE-32E-1 CCU. (See Figure 200-371

H.Check the DC output voltages which can be read on the corresponding 6 pin (54) connector of each CCU, as shown in Figure 200-38. These voltages can be checked at the test pins on the CPU-E( 1 ETU or on the MMC-E ETU, in the corresponding ecu.

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