User manual

AC Adjustable Frequency Drives
Important Safety and Product Information
165
Abridged Description of UL Standard 698
Test Requirements
Explosion Test — During a series of tests in which gas-air
mixtures of the specific gas, over its range of explosive
concentrations, are ignited inside the enclosure, the enclosure shall
prevent the passage of flame and sparks capable of igniting a
similar gas-air mixture surrounding the enclosure. In addition,
there shall be no mechanical damage to enclosed electrical
mechanisms or the enclosure.
Hydrostatic Test — The enclosure shall withstand for 1 minute a
hydrostatic test based on the maximum internal explosion pressure
developed during the explosion tests, as follows: cast metal, four
times the explosion pressure without rupture or permanent
deformation; fabricated steel, twice the explosion pressure without
permanent deformation and three times the explosion pressure
without rupture. Exception: Hydrostatic tests may be omitted if
calculations show safety factor of 5:1 for cast metal and 4:1 for
fabricated steel.
Temperature Test — The enclosed device is subjected to a
temperature test to determine maximum temperature at any point
on the external surface. The device must be marked with a
temperature code based on the result only if the temperature
exceeds (+212 °F) +100 °C.
Dust Penetration Test — The device is operated at full rated load
until equilibrium temperatures are attained, then allowed to cool to
ambient (room) temperature, through six heating and cooling
cycles covering at least 30 hours, while continuously exposed to
circulating dust of specified properties in a test chamber. No dust
shall enter the enclosure.
Temperature Test with Dust Blanket
This test is conducted as described for the Dust Penetration test
except that the recirculating dust nozzles are positioned so that the
dust is not blown directly on the device under test. The device is
operated at full rated load (and under abnormal conditions for
equipment subject to overloading) until equilibrium temperatures
are attained. Dust in contact with the enclosure shall not ignite or
discolor from heat, and the exterior temperatures based on (+104
°F) +40 °C ambient shall not exceed:
Group Normal Operation Abnormal Operation
E
F
G
(+392 °F) +200 °C
(+302 °F) +150 °C
(+248 °F) +120 °C
(+392 °F) +200 °C
(+392 °F) +200 °C
(+329 °F) +165 °C
Degree of Protection
IEC Publication 529 describes standard Degrees of Protection that
enclosures of a product are designed to provide when properly
installed.
Summary
The publication defines degrees of protection with respect to:
y Persons
y Equipment within the enclosure
y Ingress of water
It does not define:
y Protection against risk of explosion
y Environmental protection (e.g. against humidity, corrosive
atmospheres or fluids, fungus or the ingress of vermin)
Note: The IEC test requirements for Degrees of Protection against
liquid ingress refer only to water. Those products in this catalog,
which have a high degree of protection against ingress of liquid, in
most cases include Nitrile seals. These have good resistance to a
wide range of oils, coolants and cutting fluids. However, some of
the available lubricants, hydraulic fluids and solvents can cause
severe deterioration of Nitrile and other polymers. Some of the
products listed are available with seals of Viton or other materials
for improved resistance to such liquids. For specific advice on this
subject refer to your local Allen-Bradley Sales Office.
IEC Enclosure Classification
The degree of protection is indicated by two letters (IP) and two
numerals. International Standard IEC 529 contains descriptions
and associated test requirements that define the degree of
protection each numeral specifies. The following table indicates
the general degree of protection — refer to Abridged Descriptions
of IEC Enclosure Test Requirements below and on page
Important-11. For complete test requirements refer to IEC 529.
First Numeral✶ Second Numeral✶
Protection of persons against access
to hazardous parts and protection
against penetration of solid foreign
objects.
Protection against ingress of water
under test conditions specified in
IEC 529.
Non-protected Non-protected
Back of hand; objects greater than
50 mm in diameter
Vertically falling drops of water
Finger; objects greater than 12.5 mm
in diameter
Vertically falling drops of water with
enclosure tilted 15 degrees
Tools or objects greater than 2.5 mm
in diameter
Spraying water
Tools or objects greater than 1.0 mm
in diameter
Splashing water
Dust-protected (dust may enter
during specified test but must not
interfere with operation of the
equipment or impair safety)
Water jets
Dusttight (no dust observable inside
enclosure at end of test)
Powerful water jets
Temporary submersion
Continuous submersion
Example: IP41 describes an enclosure that is designed to protect against
the entry of tools or objects greater than 1 mm in diameter and to protect
against vertically dripping water under specified test conditions.
Note: All first numerals and second numerals up to and including
characteristic numeral 6, imply compliance also with the requirements for
all lower characteristic numerals in their respective series (first or second).
Second numerals 7 and 8 do not imply suitability for exposure to water jets
(second characteristic numeral 5 or 6) unless dual coded; e.g., IP_5/IP_7.
✶ The IEC standard permits use of certain supplementary letters with the
characteristic numerals. If such letters are used, refer to IEC 529 for the
explanation.