ABB ESI-S, Installation, Operation And Maintanance Manual, Page: 182 / 223

182 Operating instructions  Manual Energy Storage Inverter ESI-S
Supply is applied
Controller running, DC
capacitors charging
Start the system
Close the AC contactor,
fans are running
Start IGBT’s
Charge DC capacitors
to battery voltage
DC voltage =
battery voltage?
Close DC contactor
System in idle
N
Y
DC capacitors preload
check
Figure 92: inverter start-up sequence when power is applied and the start command is given
In Figure 92 it may be seen that:
− The DC capacitors charge as soon as the auxiliary circuit power is switched on.
− The start-up sequence consists of the DC capacitors voltage check, the closure of
the inverter AC contactor, the start of fan and the starting of the IGBTs
− If harmonics mitigation feature is activated, the network identification may be
done after the start-up sequence has finished. This network identification will
always be done when harmonic components were selected and the supply to the
inverter was removed before or when new harmonic components have been
selected. The network identification may also be done automatically during
normal inverter operation if the inverter controller has noted a big change of
network impedance.
− At the end of the start-up procedure, the inverter will work as programmed
Remark: if power quality features are enabled and the inverter running at 100% load
while RMS current rating is not attained.