Installing
4.5 Connecting the line supply, motor, and inverter components
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
79
In a TT line system, the transformer grounding and the installation grounding are
independent of one another.
There are TT systems with and without transfer of the neutral conductor N.
Inverter operated on a TT line system
● Inverter with integrated or external line filter:
– Operation on TT line systems with grounded neutral point permissible.
– Operation on TT line systems without grounded neutral point not permissible.
● Inverter without line filter:
– Operation on all TT line systems permissible.
● For installations in compliance with IEC, operation on a TT line system is permissible. For
installations in compliance with UL, operation on a TT line system is not permissible.
Examples for inverters connected to a TT line system
Image 4-3 TT line system with neutral conductor N and with grounded neutral point
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