
28
CN 3960 Hardware Installation Guide
I
NSTALLATION
P
OWER
S
UPPLY
10.Set the On/Off switch for power supply PS_A (and PS_B if installed) to the On
position.
11.Verify that the power supply LEDs are green. See the Unit Status LEDs section on
page 40 for additional information.
You have now installed and verified the power supply. The following LED indications
should be present on the CN 3960:
•
PS A - solid green
•
PS B - either solid green (if redundant power supplies are installed) or off (if a single
power supply is installed)
•
PWR - solid green
NOTE: The system cannot distinguish between a faulty and an unpowered supply. As a
result, if redundant power supplies are installed, but only one supply is connected to a
power source, the unpowered supply will cause the system to report an alarm state (ALRM
LED solid yellow and STAT LED off). This alarm will be cleared when the power supply is
properly initialized.
The power cable should be properly secured to avoid accidental disconnection. See the
Restraining the Power Cord section on page 26 for more information.
Removing an AC Power Supply
Power supplies are hot-swappable, allowing one power supply to be removed and
replaced while the remaining supply will compensate to maintain uninterrupted system
operation. However, care must be taken to avoid personal injury when removing a power
supply while the unit is powered by the second unit.
WARNING: Keep hands and fingers out of the power supply slots as voltage is present on
the switch backplane when the system is operating.
1. Disconnect the power cord from the power source.
2. If the power cable is attached to the power supply using a cable tie, use cutters to
remove the secured power cable from the handle of the power supply.
3. Disconnect the power cord from the power supply.
4. Use a Phillips screwdriver to loosen the single captive hold-down screw that secures
the power supply.
5. Grasp the power supply handle and pull the supply straight out of the slot, supporting
the supply with your other hand.
6. Do one of the following:
•
Install a replacement unit immediately. See the
Installing an AC Power Supply section
on page 27 for installation instructions.
•
If the slot is to remain empty for any length of time, install the power supply cover
plate that was removed when the second supply was initially installed over the empty
power supply slot.
You have now safely removed the power supply and secured the power supply slot from
damage by installing the cover plate.
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