User manual

AC Adjustable Frequency Drives
Important Safety and Product Information
166
Abridged Descriptions of IEC Enclosure
Test Requirements
(Refer to IEC 529 for complete test specifications — e.g., test
apparatus configuration; tolerances; etc. For Metric Conversion
factors — see page Important-2.)
Tests for Protection Against Access to
Hazardous Parts (first characteristic numeral)
The first characteristic numeral of the IP number indicates
compliance with the following tests for the degree of protection
against access to hazardous parts. It also indicates compliance
with tests as shown in the next section for the degree of protection
against solid foreign objects.
The protection against access to hazardous parts is satisfactory if
adequate clearance is kept between the specified access probe and
hazardous parts. For voltages less than 1000V AC and 1500V DC,
the access probe must not touch the hazardous live parts. For
voltages exceeding 1000V AC and 1500V DC, the equipment
must be capable of withstanding specified dielectric tests with the
access probe in the most unfavorable position.
IP0_ — No test required.
IP1_ — A rigid sphere 50 mm in diameter shall not completely
pass through any opening. Force = 50 N.
IP2_ — A jointed test finger 80 mm long and 12 mm in
diameter may penetrate to its 80 mm length, but shall
have adequate clearance as specified above, from
hazardous live parts, in every possible position of the
test finger as both joints are bent through an angle up to
90°. Force = 10 N.
IP3_ — A test rod 2.5 mm in diameter shall not penetrate and
adequate clearance shall be kept from hazardous live
parts (as specified above). Force = 3 N.
IP4_ — A test wire 1 mm in diameter shall not penetrate and
adequate clearance shall be kept from hazardous live
parts (as specified above). Force = 1 N.
IP5_ — A test wire 1 mm in diameter shall not penetrate and
adequate clearance shall be kept from hazardous live
parts (as specified on page Important-11). Force = 1 N.
IP6_ — A test wire 1 mm in diameter shall not penetrate and
adequate clearance shall be kept from hazardous live
parts (as specified on page Important-11). Force = 1 N.
Tests for Protection Against Solid Foreign
Objects (first characteristic numeral)
For first numerals 1, 2, 3, and 4 the protection against solid
foreign objects is satisfactory if the full diameter of the specified
probe does not pass through any opening. Note that for first
numerals 3 and 4 the probes are intended to simulate foreign
objects which may be spherical. Where shape of the entry path
leaves any doubt about ingress or a spherical object capable of
motion, it may be necessary to examine drawings or to provide
special access for the object probe. For first numerals 5 and 6 see
test descriptions below for acceptance criteria.
IP0_ — No test required.
IP1_ — The full diameter of a rigid sphere 50 mm in diameter
must not pass through any opening at a test force of 50
N.
IP2_ — The full diameter of a rigid sphere 12.5 mm in diameter
must not pass through any opening at a test force of
30 N.
IP3_ — A rigid steel rod 2.5 mm in diameter must not pass
through any opening at a test force of 3 N.
IP4_ — A rigid steel wire 1 mm in diameter must not pass
through any opening at a test force of 1 N.
IP5_ — The test specimen is supported inside a specified dust
chamber where talcum powder, able to pass through a
square-meshed sieve with wire diameter 50 mm and
width between wires 75 mm, is kept in suspension.
Enclosures for equipment subject to thermal cycling
effects (category 1) are vacuum pumped to a reduced
internal pressure relative to the surrounding atmosphere:
maximum depression = 2 kPa; maximum extraction rate
= 60 volumes per hour. If extraction rate of 40 to 60
volumes/h is obtained, test is continued until 80 volumes
have been drawn through or 8 h has elapsed. If
extraction rate is less than 40 volumes/h at 20 kPa
depression, test time = 8 h.
Enclosures for equipment not subject to thermal cycling
effects and designated category 2 in the relevant product
standard are tested for 8 h without vacuum pumping.
Protection is satisfactory if talcum powder has not
accumulated in a quantity or location such that, as with
any other kind of dust, it could interfere with the correct
operation of the equipment or impair safety; and no dust
has been deposited where it could lead to tracking along
creepage distances.
IP6_ — All enclosures are tested as category 1, as specified
above for IP5_. The protection is satisfactory if no
deposit of dust is observable inside the enclosure at the
end of the test.
Tests for Protection Against Water (second
characteristic numeral)
The second characteristic numeral of the IP number indicates
compliance with the following tests for the degree of protection
against water. For numerals 1 through 7, the protection is
satisfactory if any water that has entered does not interfere with
satisfactory operation, does not reach live parts not designed to
operate when wet, and does not accumulate near a cable entry or
enter the cable. For second numeral 8 the protection is satisfactory
if no water has entered the enclosure.
IP_0 — No test required.
IP_1 — Water is dripped onto the enclosure from a “drip box”
having spouts spaced on a 20 mm square pattern, at a
“rainfall” rate of 1 mm/min. The enclosure is placed in
its normal operating position under the drip box. Test
time = 10 min.