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Converter Operation On A Grounded Network; Insulated Bearings When Operating The Converter - Siemens 1LA8 Operating & Installation Instructions Manual

Low-voltage motor simotics tn series n-compact.
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Converter documentation
The operating instructions for the converter are not part of this documentation. Refer also to
the configuration information for the converter.

Converter operation on a grounded network

Damage resulting from protective conductor currents
When the machine is operated on a converter with current limiter, but without ground-fault
monitoring, protective conductor currents of up to 1.7 times the external conductor current
can arise if there is a ground fault on the output side. Neither the PE conductors of normally
rated multi-core connecting cables nor the PE connecting points of normal terminal boxes
are suitable for this purpose. Material damage can result.
● Use an appropriately sized PE conductor.
● Connect the PE conductor to the grounding terminal on the motor enclosure.

Insulated bearings when operating the converter

If the machine is operated from a low-voltage converter, insulated bearings are fitted at the
NDE and an insulated encoder with insulated bearings (option).
Comply with the plates on the machine relating to bearing insulation and possible bridges.
Figure 4-2
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 08/2017
Driving machine
Schematic representation of a single drive
4.16 Converter operation
Insulated bearings
Insulated tachometer fitting
Preparations for use


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