Tandem Operation; Mechanical Limit Speeds For Converter Operation - Siemens SIMOTICS XP 1MB155 Operating Instructions Manual

Preparations for use
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

Mechanical limit speeds for converter operation

Observe the information on the rating plate regarding the mechanical limit speeds for inverter
operation.
48
Driving machine
Motor
Coupling
Schematic representation of a tandem drive
④
Insulated bearings
⑤
Insulated tachometer fitting
⑥
Insulated coupling
Operating Instructions, 03/2018, A5E41926185A
1MB155 / 1MB555