Siemens sinamics dcp - Page 355

Operation
7.12 Precharging of the DC links
SINAMICS DCP
Operating Instructions, 09/2019, A5E34382853K
353
Figure 7-76 Resistance precharging sequence at both sides (p55350 = 3)
Time (1):
A request is issued to close the precharging contactor of side 1 (K11) and the system waits
for the delay time p55355[0] for the voltage precharging at side 1 to expire.
Time (2):
The capacitance at side 1 of the SINAMICS DCP (U1_DCP) must have been charged up to
voltage U1 at this time.
The following conditions must be checked after delay time p55355[0] has expired:
● Voltage U1_DCP must be greater than the minimum voltage p55105 and
● it must not fluctuate more than tolerance p55357[0].
If these conditions are satisfied, then a request is issued to close the main contactor of side
1 (K12), and the system waits for delay time p55356[0] to expire to close the contactor.
If this is not the case, then fault message F60501 is output with fault value 1.
Time (3):
The precharging contactor of side 1 (K11) is opened, and a request is issued to close the
precharging contactor of side 2 (K21). The system then waits for the delay time p55355[1] to
expire for the precharging of the voltage at side 2.
Time (4):
The capacitance at side 2 of the SINAMICS DCP (U2_DCP) must have been charged up to
voltage U2 at this time.
The following conditions must be checked after the delay time p55355[1] has expired:
● Voltage U2_DCP must be greater than the minimum voltage p55105 and
● it must not fluctuate more than tolerance p55357[1].
If these conditions are satisfied, then a request is issued to close the main contactor of side
2 (K22), and the system waits for delay time p55356[1] to expire to close the contactor.
If this is not the case, fault message F60501 is output with fault value 2.
Time (5):
The precharging contactor of side 2 (K21) is opened. The closed-loop control and the pulses
are enabled.