Converter Operation On A Grounded Network; Insulated Bearings When Operating The Converter; Figure 4-2 Schematic Representation Of A Single Drive - Siemens SIMOTICS TN N-compact 1LH8 Operating Instructions & Installation Instructions

Preparations for use
4.15 Converter operation
4.15.4

Converter operation on a grounded network

NOTICE
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.
4.15.5

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.
①
②
③
Figure 4-2
NOTICE
Bearing damage
The bearing insulation must not be bridged. Bearing currents can damage bearings.
● Also for subsequent installation work, such as the installation of an automatic lubrication
● Contact the Service Center, if necessary.
40
Driving machine
Motor
Coupling
Schematic representation of a single drive
system or a non-insulated vibration sensor, make sure that the bearing insulation cannot
be bridged.
④
Insulated bearings
⑤
Insulated tachometer fitting
SIMOTICS TN Series N-compact 1LH8
Operating Instructions 06/2017