voltages are then routed to PDMs, sometimes referred to as AC power strips, mounted on the two
vertical rails in the rear of the rack.
1
0130a
2
3
5
4
5
4. AC receptacles1. PDU 1
5. Mounting hardware2. PDU 2
3. Circuit breakers
Figure 18 Dual PDU assembly
PDU 1
PDU 1 connects to AC power distribution source 1. A PDU 1 failure:
• Disables the power distribution circuit.
• Removes power from PDMs 1, 2, and 3.
• Disables PS 1 in the drive enclosures.
• Disables the Controller 1 power supply.
PDU 2
PDU 2 connects to AC power distribution source 2. A PDU 2 failure:
• Disables the power distribution circuit.
• Removes power from PDMs 4, 5, and 6.
• Disables PS 2 in the drive enclosures.
• Disables the Controller 2 power supply.
PDMs
There are six PDMs mounted in the rear of each rack:
• Three mounted on the left vertical rail connect to PDU 1.
• Three mounted on the right vertical rail connect to PDU 2.
Each PDM has eight AC receptacles and one thermal circuit breaker. The PDMs distribute the AC
power from the PDUs to the enclosures. Two power sources exist for each controller pair and drive
enclosure. If a PDU fails, the system will remain operational.
EVA4400 hardware30
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