Lenze MDxMA-MHxMA-MFxMA-MDERA-MHERA Three-phase AC motors - Manual (Page 33)

Electrical installation
Three−phase AC motor operation on a frequency inverter
6
l
33 BA 33.0005−EN 2.0
Minimum requirements for basic
insulation according to IEC/EN
60664−1 (CE) Higher requirements for UL design Motor diameter
3.87 mm
6.4 mm < 178 mm
9.5 mm > 178 mm
ƒ The terminal box has to be free of foreign bodies, dirt, and humidity.
ƒ All unused cable entries and the box itself must be sealed against dust and water.
6.2 Three−phase AC motor operation on a frequency inverter
(
Stop!
Motors MF
LMA are only suitable for frequency inverter operation.
L−force three−phase AC motors M
LLMA are suitable for the operation on Lenze frequency
inverters and can be combined without restriction.
If another inverter is used for operation, the voltage peaks (U
pp
) for given rise times (t
R
) as
shown in the diagram must not be exceeded.
MT−MDXMA−005.iso/dms
Fig. 2 Permissible voltage peaks for frequency inverter operation (characteristic according to IEC
60034−25, curve A)