Compaq Recommended Specifications Operating Environment; Voltage; Voltage Unbalance; Voltage Transients - Compaq ALPHA GS320 Information Manual

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:
Range:
Crest Factor:

8.2 Voltage Unbalance

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

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:
Range:

8.6 Phase Angle Unbalance

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

8.7 Phase Rotation

ABC
Single-phase products:
Three-phase products:
Single-phase products:
Three-phase products:
(V max - V min ) x 100
(V avg )
V max = maximum line-to-line RMS voltage
V min = minimum line-to-line RMS voltage
(V AB + V BC + V CA )
V avg = ----------------------------
3
V AB , V BC , V CA = line-to-line voltage
60 Hz
59 - 61 Hz
120 Volts
208Y/120 Volts
104 - 128 Volts
180 - 220 Volts
1.4 + 1%
26