Manual Energy Storage Inverter ESI-S
Electrical design and installation 49
7. Connect the 2 DC cables to the + and – connectors.
+
-
Figure 35: Connecting the DC power cables to the inverter DC terminals
8. Slide the bottom protective cover up and fix it with the screws to seal off the power
supply terminals
9. In addition to the power cables (AC and DC) and the earth connection cable, the CT
connection cable and any other control cables used for enhanced functions can at this
stage be passed through the protective cover into the inverter panel.
10. Preparation of the inverter to match the networks voltages:
The inverter nominal voltage setting must be adapted to the actual network voltage by
adjusting the tap setting of the auxiliary transformer. If the tap setting for your network
voltage is not available, then choose a tap just above the network voltage present (e.g.
for 390V network choose 400V tap setting). The auxiliary transformer is situated at the
bottom right side of the inverter (Cf. Figure 17, item 15). Ensure that the inverter panel is
isolated before changing the transformer tap setting.
By default the tap setting of the auxiliary transformer is set at the highest voltage
position at the inverter production stage.
WARNING: The tap setting of the auxiliary transformer’s primary must be adapted
according to the network voltage to avoid a too high or too low auxiliary voltage. If
the tap setting for your network voltage is not available, then choose a tap just above
the network voltage present (e.g. for 390V network choose 400V tap setting).
Excessive (auxiliary) voltage levels will lead to inverter damage.
6.9 Connection control the DC switch
The ESI-S is not connected directly to the battery, a DC switch has to be installed
between the ESI-S and the battery. The DC switch is driven by the inverter. The command
of the DC switch has to be connected to the X5-1 and X5-2 connectors in the inverter. The
output voltage from the inverter for the contactor command is 230V V
ac
. The max DC
current allowed for ESI-S single phase is 120A.