1510 Industrial PC Computer System Manual
26
Enclosures
The 1510 systems are designed for installation within a clean and dry enclosure. The re-
quirements for enclosure fittings, conduit, and wiring vary according to the specific rat-
ing of the location and the type of flammable or combustible material involved. Those
requirements are beyond the scope of this document and it is the responsibility of the
customer to ensure that their installation is compliant with codes and regulations that ap-
ply to their specific location. Reference NFPA 70, Article 500 for specific regulations in
the United States.
System Power
On the average, the temperature within the 1510 is 7-10°C higher than that outside the
enclosure. When the ambient (exterior) temperature reaches 42°C, the system’s power
supply will begin to derate at a rate of 3.25 watts per increase of 1°C. The 1510 is rated
to work at temperatures up to 50°C.
It is always a good idea to use isolation transformers on the incoming AC power line to
the 1510. An isolation transformer is especially desirable in cases where heavy equip-
ment 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 Fed-
eral, 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 electri-
cal 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 system with mini-
mal 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, lo-
cate 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 in-
stallations where high levels of electrical noise are expected. Ground the chassis
with a ground rod or attach to a 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 non-
conductive material from the area where a chassis makes contact with the enclosure.
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.