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Under certain circumstances VLT® FC-series drives in IP55/66 and Type3R/4X configuration can be used for outdoor installation
down to -25°C. This applies to the following drives:
VLT® AutomationDrive FC 301/302
VLT® AQUA Drive FC 202
VLT® Refrigeration Drive FC 103
VLT® HVAC Drive FC 102
To facilitate outdoor installation, condensing liquid inside the drive has to be prevented. This section outlines the conditions under
which outdoor usage of the drive is permitted:
Ensure drive temperature, through:
Keeping the drive always powered on for temperatures below 0°C.
Keeping the drive running at maximum 50% load for minimum 10 minutes before increasing to full load for temperatures
below -10°C/14°F.
Shield the drive against direct sunlight, preferably by using the weather shield provided by Danfoss. The weather shield is de-
signed to provide more protection of outdoor rated drives, when there is a risk of snow collecting on the top of the drive or
excessive rain, which could subcool the drive, leading to internal condensation. The weather shield is made of corrosion resist-
ant stainless steel AISI316 and is also suitable for installation in coastal areas and marine environments.
Using DC hold keeps the temperature at a level where condensation does not form. This function can be activated in parameter
1–80. This selection makes sure that no condensation takes place in the drive as long as the drive is powered on. Furthermore, it
keeps condensation out of the motor.
For temperatures from 0°C to –10°C:
Set the fan control to low-temperature environment setting in parameter 14–52 to switch
off the heat sink fan and therefore the external fan. This adjusts the fan control to the cold environment to prevent the negative
effect from further cooling and triggering a false alarm.
For temperatures below –20°C:
Set the fan control to low-temperature environment setting in parameter 14–52 to switch off
the heat sink fan and therefore the external fan. This adjusts the fan control to the cold environment to prevent the negative
effect from further cooling and triggering a false alarm. Disable parameter 14–53. This prevents warnings to be issued falsely
due to cold temperatures.
9.2.4 Potentially Explosive Atmospheres
W A R N I N G
EXPLOSIVE ATMOSPHERE
Installing the drive in a potentially explosive atmosphere can lead to death, personal injury, or property damage.
Install the unit in a cabinet outside of the potentially explosive area.
Use a motor with an appropriate ATEX protection class.
Install a PTC temperature sensor to monitor the motor temperature.
Install short motor cables.
Use sine-wave output filters when shielded motor cables are not used.
As required by the EU Directive 2014/34/EU, any electrical or electronic device intended for use in an environment with a potentially
explosive mixture of air, flammable gas, or dust must be ATEX-certified. Systems operated in this environment must fulfill the follow-
ing special conditions to comply with the ATEX protection class:
Motors with class d protection
Does not require approval. Special wiring and containment are required.
Motors with class e or class n protection
When combined with an ATEX-approved PTC monitoring device like the VLT
®
PTC Thermistor Card MCB 112, installation does not
need an individual approval from an approbated organization.
Motors with class d/e protection
The motor itself has an e ignition protection class, while the motor cabling and connection environment is in compliance with the d
classification. To attenuate the high peak voltage, use a sine-wave filter at the drive output.
AJ300847815559en-000101 / 130R0337
102 | Danfoss A/S © 2020.09
Mechanical Installation
Considerations
VLT® AQUA Drive FC 202
Design Guide