Tandem Operation; Speed Limits For Converter Operation - Siemens SIMOTICS XP 1MB1 series Operating Instructions Manual

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4.14 Converter operation

Tandem operation

If you connect two motors in series in "tandem operation", install an insulated coupling
between the motors.
①
②
③
Figure 4-3
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.
4.14.5 Tandem operation
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.
4.14.6

Speed limits for converter operation

Observe the information on the rating plate regarding the speed limits for converter
operation.
50
Driving machine
Motor
Coupling
Schematic representation of a tandem drive
④
Insulated bearings
⑤
Insulated tachometer fitting
⑥
Insulated coupling
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A