Preparations for use 
  4.14 Converter operation 
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Operating Instructions, 07/2020, A5E41926185A 
49 
If you connect 2 motors in series in "tandem operation", install an insulated coupling between 
the motors.  
 
Insulated tachometer fitting 
Figure 4-3  Schematic representation of a tandem drive 
 
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 couple 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. 
See also 
Parameterizing the converter (Page 46)