Connection
5.1 Line and motor connection
PM250 Power Module
Hardware Installation Manual, 01/2016, A5E36265179B-AA
31
In a TT line system, the transformer grounding and the installation grounding are
independent of one another.
There are TT line supplies where the neutral conductor N is either transferred – or not.
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 Power Modules connected to a TT line supply
Image 5-2 TT line system with neutral conductor N and with grounded neutral point
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