MCS Replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	90 minutes	15 minutes

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Standard Tool	1	-	-	-
Miniature ratchets for MCS site. (It is required for cable wiring in MCS)	1	-	-	-
20L Draining Tank	2	-	-	-
5L Draining Tank	1	-	-	-
Water Hand Pump	1	-	-	-
150MM FUNNEL	1	-	-	-
WATER HOSE SET (500 mm Hose)	2	-	-	-
HOSE BAND 1	2	-	-	-
Tie Wraps(20cm or longer) to fold and bind the hose of LCS/MCS to prevent from draining.	4	-	-	-
Unused newspaper or cloth to trap the drained coolant.	1	-	-	-
Plastic draining tank. (Stored under water manifold at System Cabinet left side.)	-	-	1	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
MCS (Refer to Lockout / Tagout for System Cabinet PDU Main Breaker)	1	-	-	-

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
By this replacement, 200ml of coolant for system cabinet will be decreased. Please consider the coolant level of MCS which was checked during PM. If necessary, prepare coolant water 5L (5159818).	-	-
System Power must be turned OFF. Refer to Lockout / Tagout for System Cabinet PDU Main Breaker.	-	-

Remove Front Lower Cover. Refer to SC Cover Removal.
Remove the water manifold access cover of SC.
Close the IN/OUT valves of water manifold.

Figure 1. Water Manifold Access Cover and IN/OUT Valves
Remove top cover of MCS by removing 2 screws.
Remove R side cover of MCS by removing 2 screws.

Figure 2. Cover Removal of MCS
Before removing the power cable of MCS, mark the terminal number on each cable so that you can restore correctly. Note that MCS won’t work if phase of power lines are not correctly installed.
Disconnect the power and signal cables from MCS.
Set the water hand pump to MCS tank and draining tank.
Drain the all coolant from MCS tank.

Figure 3. Setting of Coolant Draining
Before removing the hoses from MCS, fold and bind each hose to prevent from draining. Spread unused news paper for cloth on the floor.

Figure 4. BIND EACH HOSE
Disconnect hoses from MCS rear panel.

Note:
When removing the hose easily, make a cut at the hose opening.

Figure 5. Removal of hose
Note:
Be careful the coolant does not spill to floor. If needed, use funnel and 5L tank.

Connect 500 mm hose to inlet and outlet of MCS with clamps.

Figure 6. Hose Setting of MCS Rear Panel
Restore the tank cap and covers of MCS.
Set the new MCS to the site.
Refill the drained coolant to new MCS tank.
Restore MCS and SC with reverse order of procedure.

Verify that four casters are attached on the floor.
Restore the Power. Refer to Lockout / Tagout for System Cabinet PDU Main Breaker.
Verify that LED on Reverse Phase Repay is NOT lit while MCS/LCS is running.

Figure 7. LED on Reverse Phase Repay
Perform Priming Pump. Refer to HDe MCS and LCS PRIMING PUMP Instruction.
Check the coolant level by checking that the float is in the range. Refer to Figure 8.

Figure 8. Coolant Range
Verify that there is no abnormal sounds or vibration while power is on.
Run one head or body scan.
Return the defective MCS and tank which was attached with MCS FRU kit.