7/27/2019 9 Power Problems

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Power Problemsand UPSSolutions

Memory loss,

dataerrors,

flickering ights,equipmentshutoff.

Heavy eleCtrical

equipment being

turned off.

Voltage above 110%

of rated RMS

voltage rangeofusable voltage) for

one or more cycles.

Power Surges . SurgeProtector

-+ Proteclion dependson components

.Power ine Conditioner

0 StandbyUPS

0 line-interactiveUPS. On-line UPS

Ughming strikes,

switching opera-

tions, ardng faults,

static discharge.

Memory loss, data

errors, data

loss, component

stress, burned

circuit boards.

. SurgeProtector

. Powerine Conditioner0 Standby PS. line-interactivePS. On-line PS

High VoltageSpikes

Memory loss, data

errors, data

loss, component

stress,burned

circuit boards.

lightning strikes,

switching opera-

tions, aIring faults,

static discharge.

. Surge Protector

. Power ine Conditioner

0 StandbyUPS

0 tine-interactiveUPS

. On-line PS

Rapid voltage peakup to 6.000 volts

with a duration of

lOOmS (mS -l,OOOth

of a second) o

1/2 cycle.

Rapid voltage peakup to 20,000 volts

with a duration of

10mS to lOOmS.

Switching Transients

Memory loss,

data errors,

flickering lights,equipment shutoff.

Heavy equipmentbeing turned on,

staning laIge

electrical motors,

switching powermains (internal

or utility).

Power Sags Voltage below 80%

to 85% of rated RMS

voltage for one or

more cycles

.

~ 0 SurgeProtector

~. Power tine Conditioner

~ -0 Some p o 2 cycles

~ . Standby PS~ -0 Only when nvtrter andbatterya~

~ the oweroun:t~ . ine-interactiveUPS~ -0 Boost n:uit (~qui~ batteryhelp)

~ . On-line UPS

Data error, data

loss. keyboanI

lockup, storage loss,

system lockup.

Radio Frequency

Interference (RFI)

and Electromagnetic

Interference (EMI)

and other

frequency causes.

Electtic motors,

relays, motor

control devices,

broadcast ttansmis-

sions, microwave

radiation, distantelectrical Stonns.

0 SurgeProtector. Power ine Conditioner. Standby UPS

-+ With iltering. ine-interactiveUPS

-+ Withfiltering

. On-line UPS

Electrical Line Noise

T

Disk crash, keyboard

lockup, program fail-

ures, data corruption.

Erratic operation

of emergency

power generators,

unstable frequency

power sources.

0 SurgeProtector

0 PowerUne Conditioner

. StandbyUPS

-.. With filtmng. Une-interactiveUPS

-.. With iltering. On-line UPS

Frequency Variation : A changen: requencyof more

: than3 Hz.

,~ Premature hardware

j failure, data loss: and corruption.

A steady state of

RMS voltageunder nominal

by a relatively

constant peocentage.

Heavy equipment

being tUrned on,starting large

electrical mo[o~,

switching power

mains (internal

and utility), over-

loaded cin:ujts.

Brownout

--T\---(\--~--

_J__V_-~--~

0 SurgeProtector

.Power ine Conditioner-+ Some p 10 cyc~

. StandbyUPS

. line-interactiveUPS

-+ Boost =it (rEqui~ battery~lp)

. On-linePS

Cin:uit breaker

tripped,powerdistribution failure,

utility power fail~

0 Surge rotector0 Power neConditioner. StandbyUPS. Une-interactiveUPS

. On-lineUPS

A zero-voltage

condition lasting

for more than

tWo cycles.

Power Failure---~1!t: