Paradyne 3000 manual Power Transformer Unit Installation

Installation

4.At the rear of the carrier (Figure 3-7), disconnect the ac power cord from the carrier.

NOTE

Removing power causes loss of service to all 16 circuit card slots in the carrier. It is therefore recommended that this procedure not be performed during peak operating hours.

5.If this is a new installation, proceed to Step 6. If the carrier has already been installed, you must remove the fan module (if installed) and the power transformer unit:

a.At the rear of the carrier, unscrew the two captive screws securing the power unit. Disconnect the two power connectors (P19 and P20) by pressing the catch on the bottom of each and pull it free of its mating connector.

b.At the front of the carrier, slide the power transformer unit straight out and set it aside. You may need another person standing at the

rear to feed the transformer output wires through the opening in the backplane.

6.Attach either end of the 16-pin ribbon cable (delivered with the SDCP) to its connector on the carrier backplane. Feed the ribbon cable through the four built-in retainer clips provided in the carrier, then proceed to install the power transformer unit.

Power Transformer Unit Installation

To mount the power transformer unit in the carrier:

.Procedure

1.If the SDCP ribbon cable has been installed, proceed to Step 2.

Remove the cover plate by unscrewing the four captive screws at the front of the carrier.

2.At the front of the carrier, place the power transformer unit on the flanges at the bottom of the carrier (Figure 3-6). Slide the power transformer unit into place against the rear rail of the enclosure, guiding the transformer output wires through the opening in the backplane.

Figure 3-7. COMSPHERE 3000 Series Carrier (Rear)

3000-A2-GA31-80 December 1994 3-11