3
Installation
Note:
The procedures in the section are intended for service personnel only.
ENVIRONMENTAL CONSIDERATIONS
The system’s rugged design allows it to be installed in most industrial environments.
You can refer to the unit’s electrical and environmental specifications and tolerances
(page 17) for more detailed information.
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 that provide data such as the size and
types of conductors, color codes, and connections necessary for safe grounding of
electrical components. The code specifies that a grounding path must be permanent
(no solder), continuous, and able to safely conduct the ground-fault current in the sys-
tem with minimal impedance (minimum wire required is 18 AWG, 1 mm).
Observe the following practices:
•
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.
•
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 a nearby Earth structure such as a
steel support beam. Connect each different apparatus 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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