Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 333

8 Important Circuit Information
8.16 VPM Voltage Protection Module
Connecting the X3
signaling contact
8-332
X3
Fig. 8-46 Connecting the X3 signaling contact for VPM 200 and VPM 200 Dynamik
To check the function of the VPM, operate the motor at a speed for which the
EMC of the motor would be approx. 650 V eff. An oscilloscope is used to mea-
sure the motor voltage. This requires that a pulse inhibit is initiated on the con-
verter system and on the I/R unit. When the VPM is activated, the motor voltage
must fall to just a few volts, if not, the VPM is defect!
Note
To measure the EMC:
Perform the measurement with the oscilloscope. For the measurement, either
potential–separate active voltage dividers for high voltages or passive probes
explicitly suitable for voltages above 1.5 kV must be used. Multimeters, also not
effective value multimeters, cannot be used.
No standard probes may be used for the oscilloscope measurement. For
measurement with passive probe, the ground clip must be set to ground, under
no circumstances to the converter terminal. Then use the oscilloscope to
subtract two channels, e.g. U voltage to ground and V voltage to ground, from
each other and display the result on the screen.
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
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