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Siemens 1LA8 Operating & Installation Instructions Manual Page 48

Low-voltage motor simotics tn series n-compact.
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Preparations for use
4.16 Converter operation
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.
Tandem operation
If you connect two motors in series in "tandem operation", install an insulated coupling between
the motors.
Figure 4-3
Bearing damage
Bearing currents can flow if the coupling between the motors of the tandem drive is not
insulated. This can damage the DE bearings of both motors.
● Use an insulated coupling to link the motors.
See also
Service and Support (Page 149)
If you connect two motors in series in "tandem operation", locate a coupling between the
motors; this coupling should satisfy the Directive 2014/34/EU or the regulations that apply in
the country where the equipment is installed.
system or a non-insulated vibration sensor, make sure that the bearing insulation cannot
be bridged.
Driving machine
Schematic representation of a tandem drive
Insulated bearings
Insulated tachometer fitting
Insulated coupling
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 08/2017


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