Nokia IP1260 Installation Guide - Page 142
In this situation, the power supply still meets all safety standards.This
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8 Installing and Replacing Other Components 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. Caution The Nokia IP1200 Series power supply might be hot to the touch when the power supply unit is plugged in to an AC power source and the power supply is not turned on AC power receptacle Power supply A Power supply B Integrated power supply Power supply switches cooling fans 00308a 142 Nokia IP1200 Series Security Platform Installation Guide