Siemens 611 User Manual

 

Commissioning 

 

9.2 Procedure 

9.2.4 

Measuring the EMF voltages 

Procedure for fault messages 

If the torque motor was commissioned according to the relevant instructions and unexplained 

fault messages still occur, then the individual EMF voltages of the torque motor must be 

checked using an oscilloscope. If unexplained fault messages arise during parallel operation, 

all EMF voltages of the torque motors being run in parallel must be checked individually. 

Checking the phase sequence U V W 

If motors are connected in parallel (tandem configuration), the EMF_U of motor 1 must be in 

phase with the EMF_U of motor 2. The same applies to EMF_U and EMF_W. 
It is essential that this is checked by measurement for motor 1 and motor 2 successively as 

follows: 
●  Disconnect terminals 48 and 63 from the line infeed module and terminal 663 from the 

Control Unit. 

●  You must wait until the DC link has been discharged. 
●  Disconnect the power cable from the motor. Disconnect the parallel connections between 

the motors. 

●  Form an artificial neutral point using 1 kohm resistors. 

0RWRU

(0)B:

(0)B8

(0)B9

 

Figure 9-11  Configuration for checking by measurement 

For a positive direction of rotation, the phase sequence must be U V W. 
The motor's direction of rotation is positive if the rotor turns clockwise (clockwise phase 

sequence). For a definition of the direction of rotation, see the chapter titled "Technical 

features" in PHB 1FW6. 

Determining the commutation angle offset 

With incremental measuring systems, once the RPI has been performed and with an 

oscilloscope connected the zero mark must first be traversed in order to synchronize the 

drive. Only use the oscilloscope to take measurements once the DC link has been 

discharged and when synchronization has been performed. 
With absolute measuring systems, the drive is synchronized straightaway. 

1FW6 Built-in torque motors 
Configuration Manual, 05/2009, 6SN1197-0AD00-0BP7 

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