•
•
•
-
-
-
N O T I C E
EXTREME AMBIENT CONDITIONS
Hot or cold temperatures compromise unit performance and longevity.
Do not operate in environments where the ambient temperature exceeds 55 °C (131 °F).
The drive can operate at temperatures down to -10 °C (14 °F). However, proper operation at rated load is only guaranteed at
0 °C (32 °F) or higher.
If the temperature exceeds ambient temperature limits, extra air conditioning of the cabinet or installation site is required.
5.3.1 Gases
Aggressive gases, such as hydrogen sulfide, chlorine, or ammonia, can damage electrical and mechanical components of a drive.
Contamination of the cooling air can also cause the gradual decomposition of PCB tracks and door seals. Aggressive contaminants
are often present in sewage treatment plants or swimming pools. A clear sign of an aggressive atmosphere is corroded copper.
In aggressive atmospheres, restricted IP enclosures are recommended along with conformal-coated circuit boards.
The electronic components are, as standard, coated as per IEC60721-3-3, class 3C2. For harsh and aggressive environments, coating
as per IEC60721-3-3, class 3C3 is available.
Table 12: Conformal Coating Class Ratings
Class
3C1
3C2
3C3
Gas type
Unit
Value
Mean value
Maximum value
(1)
Mean value
Maximum value
(1)
Sea salt
n/a
None
Salt mist
Salt mist
Sulfur oxide
mg/m
3
0.1
0.3
1.0
5.0
10
Hydrogen sulfide
mg/m
3
0.01
0.1
0.5
3.0
10
Chlorine
mg/m
3
0.01
0.1
0.3
0.3
1.0
Hydrogen chloride
mg/m
3
0.01
0.1
0.5
1.0
5.0
Hydrogen fluoride
mg/m
3
0.003
0.01
0.03
0.1
2.0
Ammonia
mg/m
3
0.3
1.0
3.0
10
35
Ozone
mg/m
3
0.01
0.05
0.1
0.1
0.3
Nitrogen Oxides
mg/m
3
0.1
0.5
1.0
3.0
9.0
1
Maximum values are transient peak values and are not to exceed 30 minutes per day.
Refer to
for ordering the correct protective rating.
5.3.2 Dust
Installation of drives in environments with high dust exposure is often unavoidable. Consider the following when installing drives in
such environments:
Reduced cooling.
Cooling fans.
Periodic maintenance.
Reduced cooling
Dust forms deposits on the surface of the device and inside on the 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.
This 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.
AJ330233902305en-000201 / 130R0596
38 | Danfoss A/S © 2021.05
Mechanical Installation
Considerations
VLT® Compressor Drive CDS 803
Design Guide
