9 Dimensioning
9.1 Dimensioning instructions
The dimensioning of the COMBIVERT F5 AIC occurs to the maximum permissible rated
inputcurrent.Thepowerspecicationsreferto400Vratedinputvoltage.
The DC current is dependent on the adjusted DC voltage and is not measured sepa-
rately.
Precharging
Depending on the mains input circuit of the AIC unit either the „max. external charging
current“ I
ext“ or the „max. permissible DC link capacity Cext“ must be observed
(=> „Technical data of COMBIVERT drive converters“)!
Furthermore observe the required waiting time between two switch-on procedures to
protect the precharging resistors.
Mains input circuit type A:
No current limitation for external connected DC devices is available at DC terminals
(marking ++, --) of type A. Current limitation must be ensured by the external connected
devices. The maximum external charging current may not be exceeded (=> „Unit Data“).
Mains input circuit type D1:
The current limitation of type D for the connected devices at the DC terminals (marking
+PA,-)occursbytheintegratedchargingcurrentlimit.Thespeciedmaximumpermis-
sible DC link capacity may not be exceeded by the connected devices (=> „Unit Data“).
Max. permissible total charging current (I
pre)
The current indicates the maximum expected current during the precharging procedure
and can be used for dimensioning of the pre-charging contactor.
58
DIMENSIONING
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