Enclosures - Automation Direct DL205 Manual

2–6
Installation and Wiring

Enclosures

DL205 Installation and I/O Manual, Rev. B
5. The ground terminal on the DL205 base must be connected to a single
point ground. Use copper stranded wire to achieve a low impedance.
Copper eye lugs should be crimped and soldered to the ends of the
stranded wire to ensure good surface contact. Remove anodized finishes
and use copper lugs and star washers at termination points. A general rule
is to achieve a 0.1 ohm of DC resistance between the DL205 base and the
single point ground.
6. There must be a single point ground (i.e. copper bus bar) for all devices in
the panel requiring an earth ground return. The single point of ground must
be connected to the panel ground termination.
The panel ground termination must be connected to earth ground. For this
connection you should use #12 AWG stranded copper wire as a minimum.
Minimum wire sizes, color coding, and general safety practices should
comply with appropriate electrical codes and standards for your region.
A good common ground reference (Earth ground) is essential for proper
operation of the DL205. There are several methods of providing an
adequate common ground reference, including:
a) Installing a ground rod as close to the panel as possible.
b) Connection to incoming power system ground.
7. Properly evaluate any installations where the ambient temperature may
approach the lower or upper limits of the specifications. Place a
temperature probe in the panel, close the door and operate the system until
the ambient temperature has stabilized. If the ambient temperature is not
within the operating specification for the DL205 system, measures such as
installing a cooling/heating source must be taken to get the ambient
temperature within the DL205 operating specifications.
8. Device mounting bolts and ground braid termination bolts should be #10
copper bolts or equivalent. Tapped holes instead of nut–bolt arrangements
should be used whenever possible. To assure good contact on termination
areas impediments such as paint, coating or corrosion should be removed
in the area of contact.
9. The DL205 system is designed to be powered by 110/220 VAC, 24 VDC, or
125 VDC normally available throughout an industrial environment.
Isolation transformers and noise suppression devices are not normally
necessary, but may be helpful in eliminating/reducing suspect power
problems.
Your selection of a proper enclosure is important to ensure safe and proper
operation of your DL205 system. Applications of DL205 systems vary and may
require additional features. The minimum considerations for enclosures include:
•
Conformance to electrical standards
•
Protection from the elements in an industrial environment
•
Common ground reference
•
Maintenance of specified ambient temperature
•
Access to equipment
•
Security or restricted access
S
Sufficient space for proper installation and maintenance of equipment