Converter Operation; Supply Line Configuration; Reducing Bearing Currents - Siemens SIMOTICS FD 1LL1 Operating Instructions Manual

Document all preservation measures taken so that they can be reversed before the machines
are put back into service.
4.17

Converter operation

The following chapter is relevant only if the machine has been ordered for converter operation.
Note
The order number shows whether the machine was ordered for converter operation. In this
case, digits 1, 2, 3 or 4 is located at the 6th position of the order number.
4.17.1

Supply line configuration

NOTICE
Asymmetric voltage load during operation on a TN system in delta connection
An asymmetric voltage load of the machine winding can occur during operation on a TN
system in delta connection with a grounded line conductor. Winding damage can result.
● Do not operate the machine on a TN system with a grounded line conductor.
NOTICE
Ground fault during operation on an IT system
If a ground fault occurs when connected to an IT supply system, the insulation is excessively
stressed. Winding damage can result.
● If possible, complete the process within two hours.
● Rectify the fault cause.
● Deploy a ground fault monitoring.
4.17.2

Reducing bearing currents

Taking the following actions will reduce the bearing currents:
● Ensure that the contacts are established over a large area. Solid copper cables are not
SIMOTICS FD 1LL1
Operating Instructions 04/2016
suitable for high frequency grounding because of the skin effect.
Preparations for use
4.17 Converter operation
41