VP5000-DC/DC60, VP5000-DC/DC200-HL
Notes on planning
Last edited 2019-02-08
by Sonja Scheunert
Filename
VP5000_DCDC60_200-HL_installation_manual_v1-4en.docx
88 / 173
Figure 59: Schematic diagram of the precharging contactor (A) and the main contactor (B)
Precharging circuit at [DC+]
In many cases, no precharging circuit is required at the [DC+] connection for operation as a buck
converter.
A precharging circuit at [DC+] is necessary if the VECTOPOWER is connected to an existing power
supply in the DC link [DC+/-]. The current must remain within the permissible limits when
switched on.
If a precharging circuit is only required for precharging, it is sufficient to set this up at [DC+]. This
is shown dark in the illustration.
If your application requires an all-pole disconnection (e.g. when connecting a battery), it is
advisable to set up the precharging circuit at both connections [DC+] and [DC-]. This is shown
light in the illustration.
Example: There is a battery in the DC link [DC+/-] that is separated from the DC link [DC+/-] by a
contactor. For the contactor to close, a precharging must take place. The required precharging
circuit can also be integrated in the battery.
Figure 60: Example of an external VECTOPOWER precharging circuit at [DC+/-]
