BONFIGLIOLI Vectron AEC Guia De Inicio Rapido página 32

4.2 Precharging circuit
The AEC mains unit requires separate wiring of the main power circuit and the DC-link precharging circuit.
An external precharging circuit must be installed in order to protect the mains unit from the destructive charging
currents of the DC link capacitors. A precharging circuit is installed in the mains unit between the rectifier and the
DC link capacitors. This circuit closes the contact as soon as a certain DC link voltage is reached. However, this
precharging circuit does not limit the current when the mains unit is connected to mains supply, as the AEC is
connected to mains via the inverter.
Relay X10 is controlled by the mains unit through the DC-link voltage. The discharging operation of the DC link
capacitors delays the switching operation of relay X10. The mains unit control ensures that the precharging circuit
will be switched on first before connection to mains supply.
GB
The mains unit may only be connected to mains via the precharging circuit.
Jog operation of the mains contactor is not permissible.
When disconnected from mains supply, the mains unit may only be reconnected to mains supply after a waiting
time of approx. 1 minute.
This waiting time must be considered, e.g. by means of time function elements, when setting up a control system.
The mains power circuit (mains fuses, contactor K2) must be designed for the power of the AEC mains unit.
The precharging circuit (precharging fuse, contactor K1) up to a total power of 250 kW (total of equivalent motor
shaft power values of AEC mains unit and ACU frequency inverters) must be designed for a power of 7.5 kW.
Use fuses type gL 10 A for the precharging circuit. In case the total power is higher, the precharging circuit must
be designed for higher power values accordingly.
The following circuit suggestions must be adjusted to the specific application and relevant regulations.
32
Hauptschütz
Main switch
X10
1 2 3
AEC
Quick Start Guide AEC
L10
K2
K1
Precharging switch Vorladeschütz
L0
06/13