•
•
•
•
-
-
-
-
-
-
Gas type
Unit
Class
Hydrogen chloride
mg/m
3
0.01
0.1
0.5
1.0
5.0
Hydrogen fluoride
mg/m
3
0.003
0.001
0.03
0.1
3.0
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
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.
9.2.2 Dust
Installation of drives in environments with high dust exposure is often unavoidable. Dust affects wall or frame-mounted units with
IP55 or IP66 protection rating and cabinet-mounted units with IP21 or IP20 protection rating. Consider the following when installing
drives in such environments:
Reduced cooling.
Cooling fans.
Filters.
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.
Cooling fans
The airflow for cooling the unit is produced by cooling fans, usually on the back of the unit. The fan rotors have small bearings into
which dust can penetrate and act as an abrasive. This leads to bearing damage and fan failure.
Filters
High-power drives are equipped with cooling fans that expel hot air from the interior of the unit. Above a certain size, these fans are
fitted with filter mats. These filters can quickly become clogged when used in dusty environments. Preventive measures are neces-
sary under these conditions.
Periodic maintenance
Under the conditions described above, it is recommended to clean the drive during periodic maintenance. Remove dust from the
heat sink and fans, and clean the filter mats.
9.2.3 Outdoor Installation in freezing Temperature Environments
N O T I C E
LIMITATIONS
If the drive is used daily at low temperatures, lifetime of the mains disconnect switch can be reduced. If advice in this section is
not followed, lifetime of the drive can be reduced.
For cold starts at temperatures between -10°C and -25°C, it is recommended to let the drive run in idle for 30 minutes before
loading it.
LCP @-20°C: After cold start, reasonable readability is typically reached after 5–10 s. Change of readout also takes 5–10 s.
LCP @-25°C: The LCP may have a weak readout at start-up. Normal readout is normally reached within 5 minutes. Change of
readout takes 5–10 s
ATEX: Approved down to -20°C
Usage of option VLT® 24 V DC Supply Option MCB 107: Instability issues can be expected outside normal operating range for
the drive (-10°C to +45/50°C), despite the option is the drive.
For harsh environments, for example salt mist, using IP66/Type 4X drive configuration is recommended.
AJ300847815559en-000101 / 130R0337 | 101
Danfoss A/S © 2020.09
Mechanical Installation
Considerations
VLT® AQUA Drive FC 202
Design Guide