Siemens Simovert 6SE70 Series Operating Instructions Manual page 126

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Start-Up
You can select the "Circuit identification" function in the "Ready to switch on" status (009).
Procedure:
⇓
P052 = 21
⇓
P key
⇓
Switch on the rectifier/regenerating unit.
The firing pulses are enabled, the rectifier/regenerating unit carries current and the DC link is charged up to a
certain limit! During circuit identification, the control angle is reduced until the generated separate current
crests reach an average value (with reference to an averaging time of 1/6 of the supply cycle time) of 25% of
P075 (with P160 = 150.0 %). By reducing P160 to 60.0 %, the required current crest size of up to 10 % of
P075 can be reduced (with values P160 < 60.0 %, the threshold remains at 10 % of P075). Reduction of the
size of the generated current crests may be necessary when the sum of the rated currents of the inverters
connected to the rectifier/regenerating unit significantly drops below the rated current of the
rectifier/regenerating unit.
⇓
The operating display appears. Circuit identification takes about 10 s with a discharged DC link
capacitor. The following parameters are set automatically:
⇓
On completion of the function, "Ready to switch on" (009) appears in the display.
If a fault message occurs during circuit identification, the cause of the fault must be eliminated and the function
repeated (see Section 7.1).
Circuit identification for 12-pulse mode must be carried out in succession on the 12-pulse master and on the 12-
pulse slave units (see Section 3.8.5).
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Select the "Circuit identification" function
The display appears:
The rectifier/regenerating unit must be switched on within 20 s, otherwise fault
message F091 (fault value 4) appears.
NOTE
P140 Circuit resistance of the rectifier bridge
P142 Circuit resistance of the regenerating bridge
P143 Circuit inductance of the regenerating bridge
P144 Capacitance of the DC link
P310 Proportional gain of current controller
P311 Integral-action time of current controller
P313 Proportional gain of DC link voltage controller
P772 Correction of measured values for thyristor voltage acquisition
(parameters for special access)
NOTE
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Rectifier/Regenerating Unit Operating Instructions
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09.02