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Compaq ALPHA GS320 User Manual

Page 26

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8.0 Compaq Recommended Specifications Operating Environment

The specifications presented are recommended by Compaq / Digital to optimize the
operating environment for your computer hardware.

8.1 Voltage

Nominal:

Single-phase products:

120 Volts

Three-phase products:

208Y/120 Volts

Range:

Single-phase products:

104 - 128 Volts

Three-phase products:

180 - 220 Volts

Crest Factor:

1.4 + 1%

8.2 Voltage Unbalance

Equipment requiring 3-phase power shall operate satisfactorily when the voltage unbalance is 5% or less as
calculated below.

(Vmax - Vmin) x 100

Unbalance percent = ------------------------------

(Vavg)

Where;

Vmax = maximum line-to-line RMS voltage

Vmin = minimum line-to-line RMS voltage

(VAB + VBC + VCA)

Vavg = ----------------------------

3

VAB, VBC, VCA = line-to-line voltage

8.3 Voltage Transients

Power line transients should be no greater in amplitude than the value of the nominal AC RMS voltage. This
limitation applies to common and transverse mode transients of positive or negative polarity as they are imposed in
the AC sine wave.

8.4 Voltage Harmonic Distortion

The power source voltage total harmonic distortion should not exceed 5% with any single harmonic not exceeding
3% of the fundamental frequency.

8.5 Frequency

Nominal:

60 Hz

Range:

59 - 61 Hz

8.6 Phase Angle Unbalance

Maximum of 5o variation from the 120o relationship for 3-phase power.

8.7 Phase Rotation

ABC