9
Install - Step 1 continued
Before you begin
Verify power settings and connections
1. Verify that the cabinet master switches on the power distribution panels (PDP) are
in the off position.
2. Verify that the power switch on each standby power supply (SPS) is off.
3. For high availability, verify that the A and B power cords in each enclosure are
connected to different power strips.
4. Verify that all power connections are correct and fully seated (see the figure on
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Standby power supply A (SPS A) connects to the SPS serial port (marked with
a battery symbol) on SP A; SPS B connects to the serial port on SP B.
The AC power cord for SP A connects to SPS A; the SP B cord connects to
SPS B.
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The SPSs connect to separate power distribution units (PDUs) in the cabinet.
Power/cooling module A in the first DAE3P (EA 0, bus 0) connects to SPS A;
power/cooling module B in the first DAE3P connects to SPS B.
•
Subsequent DAE3Ps connect directly to the cabinet’s PDUs. Power/cooling
modules A and B connect to different PDUs.
Connect the cabinet to a power source
Connect the cabinet AC power cables to the power outlets in your facility.
In general, EMC cabinets use two 240-volt AC cables. Connect power cables on either
side of the cabinet to different branch circuits. Connecting to only one branch circuit
will degrade the system’s high availability.
Some cabinet configurations may exceed the 24A derating that a single pair of power
sources/branch circuits supports. These configurations use a second pair of PDPs (the
upper two in your cabinet). Since each active PDP requires a separate power source, a
fully configured cabinet uses a total of four 240V branch circuit source connections, as
shown in the figure on the next page.
