Lenze 8240 frequency inverters - Manual (Page 21)

Installation
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4.2 Electrical installation
4.2.1 Important notes
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Mains Operation of the controllers Notes
With grounded neutral
(TT/TN mains)
No restrictions Observe controller ratings.
With isolated neutral
(IT mains)
Possible, if the controller is protected
from an earth fault in the supplying
mains
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by corresponding equipment which
detects the earth fault and
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immediately separates the controller
from the mains.
Safe operation in the event of an earth fault
in the output of the controller cannot be
guaranteed.
With grounded phase Operation is only possible with one
variant.
Contact Lenze.
DC-supply via +U
G
/-U
G
The DC voltage must be symmetrical to
PE.
The controller will be destroyed when
grounding +U
G
-conductor or -U
G
-conductor.
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