DCPS for Exciter Replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	30 minutes	15 minutes

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Standard Tool	1	-	-	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
DCPS for Exciter	1	-	Refer to FRU Manual	-

Table 4. Safety

Warning

ELECTROCUTION HAZARD!

Dangerous and or fatal voltages are present in the energized cabinet.

Follow LOTO steps as given in first section of this document to disable and verify safe voltage levels.

Table 5. Required conditions
Condition	Reference	Effectivity
System Power must be turned OFF. Refer to ISC PDU Main Breaker LOTO Procedure.	-	-

Location of each DC Power Supply is as following illustration

Open ISC Covers.
Remove DCPS cable bracket.
1. Loosen two screw.
2. Rotate up a little at right side and remove the bracket.
Figure 2. DCPS cable bracket
Disconnect the following cable connectors which are routed from DCPS for Exciter. If necessary, cut the tie wraps.
- P/N 5627942 (To PDU AC)
- P/N 6859084 (To Exciter J1)
- P/N 6859076 (To CABINET MONITOR J16)
Notice

DCPS Tray is tightly inserted in the bracket. Need enough pull force to remove it.
Remove DCPS for Exciter from the ISC.
1. Loosen 2 screws tightening power supply and chassis.
2. Slide out the tray.
Figure 3. Exciter DC power supply
Restore the new Exciter DC power supply by the reverse order.