Compaq 295363-002 Spécifications télécharger pdf (Page 28)

What Are the Causes and Effects of Power Problems?

Healthy Electricity

A typical sine wave form

Noise and Transients

High frequency impulses on sine wave

•Cause — radio frequency on utility line

•Effects — damage to logic circuitry and data files

Spikes

Extremely high voltage strikes to utility line

•Cause — lightning,utility load switching

•Effects — actual hardware damage,file corruption

Fluctuation:Sags and Surges (Spikes lasting longer than one cycle)

Over and under voltage conditions

•Cause — sudden startups of large loads, large load switching

•Effects — slows disk drives intolerably, causing data errors;actual hardware damage

Brownouts, Extended Sags

Periods of low voltage on utility lines

•Cause — voltage reduction by overburdened utilities, damage to electrical lines and

other factors

•Effects — causes intolerable voltage levels for circuitry and drive performance,

damaging hardware or causing data errors

Harmonic Distortion

Distortions in the current and voltage sine wave sent back by variable speed motor equipment

•Cause — computers,fax equipment, copiers

•Effects — actual hardware damage,interrupted communications

Blackouts Total Power Failures

•Cause — violent weather, overburdened power grids,car accidents that bring down

power lines, earthquakes,etc.

•Effects — hardware damage and data loss

Questions & Answers

Time

Voltage

Time

Voltage

Spikes

“Noise”

Time

Voltage

Normal

Voltage

Over

Voltage

(“Surge”)

Under Voltage

(“Sag” or “Brownout”)

Voltage

Time

Affects

Mainframe CPU

Affects

Personal Computers

Healthy Electricity (sine wave)

Noise, Transients, and Spikes

Fluctuation: Sags and Surges

Brownouts, Extended Sags

Harmonic Distortion

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Compaq 295363-002 Spécifications Page 28

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Produits connexes et manuels pour Unités de distribution d'électricité (PDU) Compaq 295363-002