Procedure A, Task 3: Customer's electricianNOTICEThis task is performed by the customer's electrician.Procedure1. Working with the EMC Customer Engineer, turn ON all the relevant circuitbreakers in customer-supplied PDU 2.Verify that only power supply and/or SPS LEDs in power zone A are ON orflashing green in every bay in the array.NoteIf all power supply and/or SPS LEDs in a bay are ON or flashing green, the bayis incorrectly wired because the AC power to both EMC power zones is suppliedby a single PDU, that is, customer-supplied PDU 2. Wiring must be correctedbefore moving on to the next step.2. Turn OFF the relevant circuit breakers in customer-supplied PDU 2.Verify that the power supply and/or SPS LEDs that turned green in theprevious step changed from green to OFF and/or flashing yellow. The yellowSPS lights flash for a maximum of 5 minutes.NoteNote that power supplies connected to an SPS continue to have green lightsON while the SPS yellow light continues to flash indicating the SPS is providingon-battery power.3. Repeat step 1 and step 2 for power zone B and customer-supplied PDU 1.4. Turn ON all the relevant circuit breakers in customer-supplied PDU 1 andcustomer-supplied PDU 2.5. Label the PDUs as described in PDU labels on page 126.Best Practices for AC Power Connections124 Site Planning Guide VMAX 250F, VMAX 450F, VMAX 850F, VMAX 950F with HYPERMAX OS
