4.3 Permissible mains supply network congurations for mo
tors
Description
In combination with the drive system, the motors are generally certied for operation on TN and
TT line systems with grounded neutral point and on IT line systems.
The following special features should be noted:
• For operation on IT line systems, the occurrence of the rst fault between an active part and
ground must be signaled by a monitoring device. According to IEC60364‑4‑41, it is
recommended that the rst fault is removed as quickly as practically possible.
Motor operation in such a fault situation can reduce the service life due to a damage
insulation system as a result of partial discharge.
• For 3 AC 380 V ... 480 V mains supply networks with a grounded line conductor, an isolating
transformer with grounded neutral point (secondary side) must be connected between the
mains supply and the drive system to protect the motor insulation from excessive stress.
Application planning
4.3Permissible mains supply network congurations for mo
tors
SINAMICS S200 PROFINET servo drive system with SIMOTICS S-1FL2
82 Operating Instructions, 11/2023, FW V6.3, A5E51646752B AB
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