Siemens SIMOTICS TN N-compact 1LH8 - Figure 4-3 Schematic Representation of a Tandem Drive

Tandem operation
If you connect two motors in series in "tandem operation", install an insulated coupling between
the motors.
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① Driving machine ④ Insulated bearings
② Motor ⑤ Insulated tachometer fitting
③ Coupling ⑥ Insulated coupling
Figure 4-3 Schematic representation of a tandem drive
NOTICE
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 129)
Preparations for use
4.15 Converter operation
SIMOTICS TN Series N-compact 1LH8
Operating Instructions 06/2017 41