Ip Rating Definitions - Danfoss VLT Refrigeration Drive FC 103 Design Manual

System Integration
Gas type Unit
3 3
Sea salt n/a
Sulphur mg/
oxides 3
m
Hydrogen mg/
sulphide
3
m
Chlorine mg/
3
m
Hydrogen mg/
chloride
m 3
Hydrogen mg/
fluoride
m 3
Ammonia mg/
3
m
Ozone mg/
3
m
Nitrogen mg/
3
m
Table 3.2 Conformal-coating Class Ratings
1) Maximum values are transient peak values not to exceed 30
minutes per day.
3.1.7.2 Dust Exposure
Installation of frequency converters in environments with
high dust exposure is often unavoidable. Dust affects wall-
or frame-mounted units with IP55 or IP66 protection
ratings, and also cabinet-mounted devices with IP21 or
IP20 protection ratings. Consider the 3 aspects described in
this section when frequency converters are installed in
such environments.
Reduced cooling
Dust forms deposits on the surface of the device and
inside on circuit boards and the electronic components.
These deposits act as insulation layers and hamper heat
transfer to the ambient air, reducing the cooling capacity.
The components become warmer, which causes
accelerated aging of the electronic components, and the
service life of the unit decreases. Dust deposits on the heat
sink in the back of the unit also decrease the service life of
the unit.
Cooling fans
The airflow for cooling the unit is produced by cooling
fans, mostly located on the back of the device. The fan
rotors have small bearings into which dust can penetrate
and act as an abrasive. Dust in the bearings leads to
bearing damage and fan failure.
38
VLT
Class
3C1 3C2
Average Maximum Average
value value value
1)
None Salt mist Salt mist
0.1 0.3 1.0 5.0
0.01 0.1 0.5 3.0
0.01 0.1 0.03 0.3
0.01 0.1 0.5 1.0
0.003 0.01 0.03 0.1
0.3 1.0 3.0 10
0.01 0.05 0.1 0.1
0.1 0.5 1.0 3.0
Danfoss A/S © 08/2015 All rights reserved.
®
Refrigeration Drive FC 103
Filters
High-power frequency converters are equipped with
3C3
cooling f,ans that expel hot air from the interior of the
Maximum
device. Above a certain size, these fans are fitted with filter
value
mats. These filters can become quickly clogged when used
1)
in dusty environments. Preventive measures are necessary
under these conditions.
10
Periodic maintenance
Under the conditions described above, it is recommended
10
to clean the frequency converter during periodic
maintenance. Remove dust from the heat sink and fans,
1.0
and clean the filter mats.
5.0

3.1.8 IP Rating Definitions

3.0
35
0.3
First digit
9.0
Second
digit
First letter
Extra letter
Table 3.3 IEC 60529 Definitions for IP Ratings
Against penetration by Against access to
solid foreign objects hazardous parts by
0 (not protected) (not protected)
≥50 mm diameter
1 Back of hand
2 12.5 mm diameter Finger
3 2.5 mm diameter Tool
≥1.0 mm diameter
4 Wire
5 Dust protected Wire
6 Dust-tight Wire
Against water
penetration with
harmful effect
0 (not protected) –
1 Drops falling vertically –
2 Drops at 15° angle –
3 Spraying water –
4 Splashing water –
5 Water jets –
6 Powerful water jets –
7 Temporary immersion –
8 Long-term immersion –
More information
specifically for
A Back of hand
B Finger
C Tool
D Wire
More information
specifically for
H High-voltage device –
M Device moving during –
water test
S Device stationary during –
water test
W Weather conditions –
MG16G202