401/402XR Series Product Manual
Appendix A - Internal Protection
26
www.parkermotion.com
Parker Hannifin Corporation
1140 Sandy Hill Road
Irwin, PA 15642
Appendix A - Internal Protection
The 404XR is protected from its environment via magnetically retained Protective Seals. Parker
Hannifin Corporation has conducted testing to determine the
degree
to which the positioner is
protected by using a British standard called an
Ingress Protection Rating (IP Rating)
.
Definition
Reference: British standard EN 60529: 1992
This standard describes a system of classifying degrees of protection provided by enclosures of
electrical equipment. Standardized test methods and the establishment of a two digit numeric rating
verify the extent of protection provided against access to hazardous parts, against ingress of solid
foreign objects, and against the ingress of water.
First Number
– The first number indicates protection of persons against access to dangerous parts
and protection of internal equipment against the ingress of solid foreign objects.
1
- Protection against access to hazardous parts with the back of a hand, and protected
against solid foreign objects of 50 mm diameter and larger.
2
- Protection of fingers against access to dangerous parts, and protection of equipment
against solid foreign objects of 12.5 mm diameter and larger.
3
- Protection against access to hazardous parts with a tool, and protection against solid
foreign objects of 2.5 mm diameter and larger.
Second Number
– The second number indicates protection of internal equipment against harmful
ingress of water.
0
- No special protection provided.
Note: Number Indicators above represent only a partial list of IP Rating specifications.
Warnings (Points of Clarity)
•
The specification applies to protection of particles, tools, parts of the body, etc., against access to
hazardous parts inside the enclosure. This does not cover external features such as switch pinch points,
pinch points causes by the motion of the carriage, or cable carrier assemblies.
•
The testing method as specified in the standard uses a solid steel rod of the appropriate diameter at a
specified force. The specification does not consider soft or pliable particles. Due to the design of the
table and sealing method, a soft particle can compress due to the motion of the table, and reduce its
cross-section. This can allow particles to enter the unit.
•
In application, shavings or chips commonly created in a machining operation are a greater concern. If
any edge or dimension of the “chip” is under the appropriate diameter, it can wedge under and start to
the lift the seals. This action will allow larger particles to do the same until failure is reached.
