Gradient System Contactor Replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	60 minutes	Not Applicable

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
Gradient System Contactor	1	-	Refer to FRU Manual	-

Table 4. Safety

DANGER

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.

DANGER

HOT SURFACE OF TRANSFORMER.

SURFACE TEMPERATURE OF TRANSFORMER WILL BE OVER 60°C (140°F) WHILE SYSTEM IS IN OPERATION.

EVEN THOUGH THE POWER IS TURNED OFF, THE HEAT WILL REMAIN FOR A LONG TIME. CONTACT WITH SURFACE WILL RESULT IN BURNS. DO NOT TOUCH TRANSFORMER.

Table 5. Required conditions
Condition	Reference	Effectivity
PDU and Service Disconnect Panel (or Main Disconnect Panel) must be turned OFF. Refer to Lockout / Tagout for MDP(Main Disconnect Panel) or Facility PDU .	-	-

Open ISC.
Remove PDU Front Panel.

Figure 1. PDU Front Panel
Disconnect all cables from the Gradient System Contactor terminal.

Figure 2. Remove cables
Remove the contactor by pulling the lever to right direction with flat screwdriver.

Figure 3. Contactor Removal
Restore contactor by the reverse order of the removal.