3700 Series Flat Panel Industrial PC
Chapter 2 – Installation
16
143311 (H)
Power Management
The following paragraphs explain the system power, the power supply, and the
effects of excessive heat, electrical noise, and line voltage variation of the 3700
unit.
System Power
Using isolation transformers on the incoming AC power line to the system is
always a good practice. An isolation transformer is especially desirable in cases in
which heavy equipment is likely to introduce noise onto the AC line.
The isolation transformer can also serve as a step-down transformer to reduce the
incoming line voltage to a desired level. The transformer should have a sufficient
power rating (units of volt-amperes) to supply the load adequately.
Proper grounding is essential to all safe electrical installations. Refer to the
relevant Federal, State/Provincial, and local electric codes, which provide data
such as the size and types of conductors, color codes and connections necessary
for safe grounding of electrical components. The Federal electric code specifies
that a grounding path must be permanent (no solder), continuous, and able to
safely conduct the ground-fault current in the system with minimal impedance
(minimum wire required is #18 AWG, 1 mm).
Observe the following practices:
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Separate ground wires (P.E., or Protective Earth) from power wires at
the point of entry to the enclosure. To minimize the ground wire length
within the enclosure, locate the ground reference point near the point of
entry for the plant power supply.
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All electrical racks or chassis and machine elements should be Earth
Grounded in installations where high levels of electrical noise can be
expected. The rack/chassis should be grounded with a ground rod or
attached to nearby Earth structure such as a steel support beam. Each
different apparatus should be connected to a single Earth Ground point
in a “star” configuration with low impedance cable. Scrape away paint
and other nonconductive material from the area where a chassis makes
contact with the enclosure.
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In addition to the ground connection made through the mounting bolt or
stud, use a one-inch metal braid or size #8 AWG wire to connect
between each chassis and the enclosure at the mounting bolt or stud.
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