Switching Frequency; Precautions While Using Aluminium Conductors - Danfoss vlt FC 102 Operating Instructions Manual

4. Electrical installation

Switching frequency

When frequency converters are used together with sine wave filters to reduce the acoustic noise from a motor, the switching frequency must be set
according to the sine wave filter instruction in

Precautions while using Aluminium conductors

Aluminium conductors are not recommended for cable cross sections below 35 mm². 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 the softness of the aluminium. It is crucial to ensure the connection makes
a gas tight joint, otherwise the aluminium surface will oxidize again.
4
30
Par. 14-01.
MG.11.A6.02 - VLT ® is a registered Danfoss trademark
®
VLT HVAC Drive Operating Instructions