Electrical Installation - Danfoss VLT AutomationDrive FC 300 Design Manual

6. How to Install
6.2.3. Safety Requirements of Mechanical Installation
The frequency converter is cooled by means of air circulation.
To protect the unit from overheating, it must be ensured that the ambient temperature
exceed the maximum temperature stated for the frequency converter
age temperature
paragraph
If the ambient temperature is in the range of 45 °C - 55 ° C, derating of the frequency converter
will become relevant, see
The service life of the frequency converter is reduced if derating for ambient temperature is not
taken into account.
6
6.2.4. Field Mounting
For field mounting the IP 21/IP 4X top/TYPE 1 kits or IP 54/55 units are recommended.

6.3. Electrical Installation

Aluminium Conductors
Terminals can accept aluminium conductors but the conductor surface has to be clean and the
oxidation must be removed and sealed by neutral acid-free Vaseline grease before the conductor
is connected.
Furthermore the terminal screw must be retightened after two days due to softness of the alu-
minium. It is crucial to keep the connection a gas tight joint, otherwise the aluminium surface will
oxidize again.
100
Pay attention to the requirements that apply to integration and field mounting kit.
Observe the information in the list to avoid serious damage or injury, especially when
installing large units.
is not exceeded . Locate the maximum temperature and 24-hour average in the
Derating for Ambient Temperature
Derating for Ambient Temperature
NB!
Cables General
All cabling must comply with national and local regulations on cable cross-sections
and ambient temperature. Copper (60/75°C) conductors are recommended.
MG.33.B9.02 - VLT
and that the 24-hour aver-
.
.
® is a registered Danfoss trademark
FC 300 Design Guide
does not