Form Dc Link (P052 = 20) - Siemens SIMOVERT Master Drives 6SE70 Betriebsanleitung

Start-Up
4.3.9.6 Form DC link
If the converters have been left to stand idle for more than a year, the DC link capacitors must be re-formed. If
the converters are taken into service within a year of being delivered (factory number, rating plate); it is not
necessary to re-form the DC link capacitors. For more details on this subject, please refer to Section 4.3.12 of
the converter's operating instructions
The DC link capacitors are formed as described below.
The "Form DC link" function can be selected in the "Ready to switch on" status (009).
Procedure:
⇓
P408
⇓
P052 = 20
⇓
P key
⇓
Switch on the rectifier/regenerating unit
The firing pulses are enabled, the common rectifier carries current and the DC link is charged!
During the forming procedure, the connected SIMOVERT Master Drives FC, VC, SC must not be switched on.
⇓
Forming of the DC link takes place (duration as set with P406):
While the forming time P408 is running, the control angle is reduced linearly from 120 degrees
to 30 degrees and the DC link capacitor is charged up to the peak value of rectifier supply
voltage.
If DC link voltage reduction is selected (control word 1 bit 11, P571), the forming procedure will
be completed on reaching a DC link voltage of P318 * rectifier network peak value.
During the forming procedure, the current limit set at P160 is not effective.
⇓
When this function has been completed, the "Ready to switch on" display (009) appears.
4-40
ENGLISH
(P052 = 20)
The "Form DC link" function may only be implemented if the common
rectifier and the converter(s) connected have the same voltage class
(9th digit position of the MLFB).
Set the forming time (1.0 to 600.0 minutes; see Section 4.3.12 of the
converter's operating instructions
Select the "Form DC link" function"
The operating display appears:
The common rectifier must be switched on within 20 s, otherwise message
F091 (fault value 4) appears.
NOTE
DANGER
Siemens AG
Common Rectifier
09.02
6SE7087-6AK85-0AA0
Operating Instructions