NCS Pearson 5000i, Руководство по установке

Страница: 22 / 54

Checking the Voltage{ XE "Scanner installation:Check the
voltage" }
Before you plug the 5000 i scanner into the designated wall outlet, the following power and
grounding requirements must be met and maintained to ensure optimum performance of the
scanner and its peripherals. To verify that the power and grounding requirements have been met,
refer to the following topics: Power Noise, Grounding, and Site Power Wiring
{ XE "Wiring" \t
" See Site power wiring recommendations" } Recommendations.
Power Noise
The 5000 i scanner is designed to operate satisfactorily under conditions of reasonable input
power noise. Input power noise specifications { XE "Power noise specifications" } are as
follows:
Condition Description
Definitions Surge or Sag – any sudden positive or negative excursion in the level
of the input voltage having a duration from 0.005 to 5 seconds.
Transient { XE "Transient specifications" } – any sudden positive or
negative change in the level of the input voltage having a duration of
between 1 nanosecond and 5 milliseconds.
Limits No surge or sag shall exceed ± 15% of the normal rated voltage.
However, the surge or sag shall be considered acceptable provided its
amplitude does not exceed ± 50% of the normal rated voltage and it
returns to the steady-state rated level within 3 cycles of input power.
Recommendations Dedicate a feeder line between the main building power panel and the
system branch circuit power panel serving the 5000
i system.
If transients, surges, or sags outside of the limits stated above exist with
a dedicated feeder, do one or both of the following.
•
Install a line conditioner to limit transients.
•
Use a constant-voltage isolation transformer to control surges or
sags.
Grounding
Proper system grounding is extremely important to the safe and reliable operation of the
system. The 5000
i scanner ground must meet two requirements:
1. It must serve as a return path for current in case of a short circuit between the power line
and the chassis of any system component.
2. It must serve as the ground reference point for the 5000 i system components and data
cables.
Page 10 5000 i Scanner Installation Guide