Installing Or Replacing A Power Supply - Nokia IP1220 Installation Manual

7
Installing and Replacing Components Other than Network Interface Cards (NICs) and Accelerated Data Path
3. Slowly pull the fan unit out of the chassis toward the rear.
4. If the IP1200 Series appliance is running, immediately install a replacement fan unit by
sliding it into the back of the appliance.
5. Tighten the four retaining screws on the new fan unit.

Installing or Replacing a Power Supply

The power supplies in the Nokia IP1200 Series appliance are hot swappable, and perform load
sharing while two active power supplies are connected in parallel. Load sharing increases the life
of the power supplies.
Note
On an appliance with two active power supplies installed, both power supplies should be
turned on for load sharing and redundancy. If both power supplies are not turned on, the
Fault LED illuminates. For more information about the Fault LED, see
LEDs" on page 28.
The power supplies are autosensing and can accept input voltages between 85 VAC and 264
VAC. The power supply output is regulated to a tolerance of ± 5 percent of the specified output
voltage.
Under certain circumstances, the power supplies feel hot to the touch. This happens when the
power supply is connected to AC power, but is not turned on. In this state the 3.3 V standby
circuitry is powered on, causing the power supply to heat up. Because the power supply is not
turned on, the integrated cooling fan is not operating.
In this situation, the power supply still meets all safety standards.This condition is normal and
does not affect the performance of the Nokia IP1200 Series. To cool the power supply down, use
the power supply switch to turn on power and activate the integrated cooling fan.
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IP1220 and IP1260 Security Platforms Installation Guide
00318.1
"Power Supply Status