Conext SW 4048-120 Manual Addendum

Documentation Update
8 976-0315-01-01 Rev E
balance between generation and consumption. As the battery bank reaches
capacity, CSW curtails PV inverter generation by raising the AC line frequency
causing compatible PV inverters to reduce their power output in an orderly
manner. This is called Active Frequency Shift Power Curtailment.
During a grid outage even a home with a grid-tie PV inverter system will be
without power because PV inverters cannot produce power without the presence
of a reference voltage and frequency. To enable the PV inverter to provide power
during a grid outage the CSW is retrofitted in front of the PV inverter. The PV
inverter is rewired from the grid connection to a critical load (sub) panel and the
AC Couple is on the CSW AC Output port.
Consult the manufacturer's specifications to determine if your PV inverter is
compatible with Active Frequency Shift Power Curtailment. CSW’s AC coupling
function is enabled by default (see “New Advanced Features Setting” on page 12).
The AC coupling advanced setting should remain enabled except in cases when
the DC voltage level is allowed to have large variations and the line frequency
needs to remain constant.
Further details about AC Coupling can be found in the document
“AC Coupling
Solutions Guide (Document Number: 976-0240-01-01)
” available at
solar.schneider-electric.com.
Storing the State of the Inverter Mode
You can enable or disable a feature called StoreInvState which, when enabled
remembers the state of the inverter mode prior to a power down (that is, when AC
and DC power sources are disconnected). When the CSW is powered up again,
the inverter mode reverts back to its prior state.
See “New Advanced Features Setting” on page 12.
NOTICE
AC COUPLED PV INVERTER COMPATIBILITY
AC power generated by AC coupling PV inverters with CSW must be
consumed by AC loads or used to charge batteries. As an alternative, the
excess power produced from a PV inverter can be routed to dump loads. Do
not AC couple PV inverters with the CSW that are unable to reduce, derate or
cease the excess PV inverter power in response to the changes in AC line
frequency controlled by the CSW. Consult the manufacturer's specifications of
your PV inverter and confirm compatibility.
Failure to follow these instructions can result in equipment damage.