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Figure 4-3 Schematic Representation Of A Tandem Drive - Siemens 1LA8 Operating Instructions Manual

Simotics tn series n-compact induction motor.
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Preparations for use
4.12 Converter operation
NOTICE
Bearing damage
The bearing insulation must not be bridged. Damage may be caused to the bearings if there
is a flow of current.
● 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.
Driving machine
Motor
Coupling
Figure 4-3
Schematic representation of a tandem drive
NOTICE
Bearing damage
If the coupling between the motors of the tandem drive is not insulated, bearing currents can
cause damage to the drive-end bearings of both motors.
Use an insulated coupling to link the motors.
If you connect two motors in series in "tandem operation", fit a coupling between the motors;
this coupling should satisfy Directive 94/9/EC or the regulations that apply in the country where
the equipment is installed..
42
system or a non-insulated vibration sensor, make sure that the bearing insulation cannot
be bridged.
Insulated bearings
Insulated tachometer fitting
Insulated coupling
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2014

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