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Dell PowerEdge PDU Metered LCD Manual
Cable Routing Procedures for the Dell PowerEdge R520 System
Section 2: Replacing a hot swap power supply on a PowerEdge
R520 system with a CMA

2.1. Replacing a hot swap power supply with a left-side mounted CMA

1. Swing the CMA to its service position as described in the CMA Installation Instructions provided
with the CMA kit.
2. If the bottom power supply is being replaced, first remove the tray from underneath the CMA as
described in the CMA Installation Instructions. If the top power supply is being replaced, the tray
can remain in place.
3. Disengage the strain relief and disconnect the power cord from the power supply.
4. Replace the power supply.
5. Plug in the power cord, re-engage the strain relief, replace the CMA support tray (if necessary),
and return the CMA to the closed (retracted) position.

2.2. Replacing a hot swap power supply with a right-side mounted CMA

1. Swing the CMA to its service position as described in the CMA Installation Instructions provided
with the CMA kit.
2. If the bottom power supply is being replaced, first remove the tray from underneath the CMA as
described in the CMA Installation Instructions. If the top power supply is being replaced, the tray
can remain in place.
3. Disengage the strain relief and disconnect the power cord from the power supply.
4. Disconnect both CMA attachment housings from the brackets on the rails as shown in Figure 8.
5. Detach the inner CMA bracket from the rail by pushing on the end of the lock spring and lifting the
bracket up and to the left until it clears the standoffs on the rail.
6. While supporting the CMA with one hand, remove and replace the power supply with the other
hand as shown in Figure 9.
7. Reinstall the inner CMA bracket to the rail and reconnect the CMA to the brackets.
8. Plug in the power cord, re-engage the strain relief, replace the CMA support tray (if necessary),
and return the CMA to the closed (retracted) position.
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