Euphonix System 5 Installation Guide
Interconnecting System Components
22
Voltage Sag
Short-duration undervoltages are called "voltage sags" or "voltage dips". A voltage sag
below 90% of the equipment rating exceeds the minimum allowable standard.
Euphonix's products have been tested and found to comply with the performance limits of
EN55103:2, E-4 Environment. Should the product be operated in a degraded power
environment, care should be taken to insure that the EN55102 Voltage Dips and Interrupt
limits are not exceeded.
Grounding
Ground leakage currents should be 0.0035A or less.
There should only be one neutral-ground bond, at the main service entrance (except in the
case of a separately derived system, i.e., an isolation transformer). The neutral-to-ground
voltage in a 120V, single phase system, is recommended to be less than 3 Vrms. In
high-availability systems, a neutral-to-ground voltage above 0.5 volts has been identified
as a possible source of disturbances.
Ground resistance is the resistance due to the resistivity of the soil in the vicinity of the
grounding electrode. Most computer equipment manufacturers recommend a maximum
ground resistance of two ohms.
Uninterruptible Power Supply
These devices are designed to provide continuous power to a load, even with an
interruption or loss of utility supply power. Since the power on an on-line UPS flows
through a rectifier and inverter before reaching the load, most power disturbances are
eliminated through constant filtering. Therefore, an on-line UPS is a good idea for all
High-Availability Systems that cannot guarantee high-quality power. Many UPS' have a
voltage regulator to compensate for voltage variances.
NOTE
: If it is determined that your facility is below standard in any of the specifications
described above,
contacting an experienced electrician (or engineering consultant
for large facilities) with expertise in power quality issues is recommended.
