User's Manual

Nexus FT Field Replaceable Units
044-05251 Rev B 4-7
PSU
To replace a PSU, follow the steps listed in Table 4-4. For details on cables and connectors, see Chapter 2.
Figure 4-1 PSU Cable, Switch and Lable locations
Table 4-4 PSU Replacement Procedure
Step Action
1 Loosen all four locking screws on front of cabinet
2 Open WRH door and secure
3 Disconnect main power plug from PSU(Location 1 shown in Figure 4-1)
4 Disconnect power cable bundle from PSU(Location 2 shown in Figure 4-1)
5 Loosen but do not remove screws securing PSU using a 5mm Allen key and remove PSU (Location 3
sh
own in Figure 4-1)
6 On new AC power supply, if used, set input voltage switch on PSU to correct input voltage -- 115 VAC
or 230 VAC (Location 4 s
hown in Figure 4-1)
7 On new DC power supply, if used, verify that the supply voltage is 24 VDC or 48 VDC as stated on
label on PSU (Locat
ion 5 shown in Figure 4-1)
8 Set new PSU to correct output supply voltage (27 VDC) by moving wire connection plug as illustrated
on label on PSU (Loc
ation 6 shown in Figure 4-1)
9 Mount new PSU with all four fixing screws (Location 3 shown in Figure 4-1)
10 Connect PSU to DIA PCBA (Location 2 shown in Figure 4-9) with cable marked VE007 98/1. This
cable must be u
sed in all situations. If only one connection is available on DIA PCBA, the second
connector may be tied out of the way with a cable tie
11 Insert power cord (AC power supply) or connect DC power cable brown wire (Europe) or black wire
(US) to
positive (+) pole a
nd blue wire (Europe) or white wire (US) to negative (-) pole (DC power
supply)
12 Close WRH door and secure with four locking screws on front of cabinet
4
5
6