KACO blueplanet 750 - 1000 kVA - Manual (Page 35)

KACO blueplanet 1000/875/750 TL3 M1 IS OD DEX0 Page 35
Storage/Installation/Start-up
5.7 Operation
DANGER
Lethal voltages are still present in the terminals and lines of the inverter even after
the inverter has been switched off and disconnected!
Coming into contact with the lines and terminals in the inverter will cause serious
injury or death.
Only authorised electricians who are approved by the supply grid operator may open,
install and maintain the inverter.
› Keep all doors and covers closed when the unit is in operation.
› Do not touch the lines and terminals when switching the unit on and off!
5.7.1 Operating states
The Inverter has eight operating states. The explanations about each state are below.
Disconnected (default) Before operation has commenced the inverter is in the disconnected state. In
this state, the inverter is totally isolated from the utility grid.
Wait When the inverter is in the “Disconnected” state and the DC switch is closed,
the ‘Key Switch On’ command is operated and the PV voltage is kept above
400V for 5 seconds, the system enters into the “Wait” state.
Connecting to Grid When the inverter is in the “Wait” state and the PV voltage is kept above the
value of “MPPT V Start” parameter during the time set by “MPPT T start”
parameter, the contactor on the grid side is turned on. The inverter keeps this
state for 8 seconds.
Initializing MPP The inverter calculates the MPPT start voltage which is product of measure-
ment of PV voltage and the parameter “MPP Factor”. After 5 seconds, the
inverter system enters into the “MPP start” state.
MPP start In this state, the inverter controls the PV voltage. Reference of the PV voltage
is determined by MPPT start voltage which is calculated at “Initializing MPP”
state.
MPPT If the PV voltage approximates the MPP start voltage (value of “MPPT V Start”
parameter), the MPPT will start. The inverter follows the MPP target value
automatically, which is varied by irradiance values. If the MPP target value is
out of the allowable MPPT range ([MPP start voltage – MPP Range lower] ~
[MPP start voltage + MPP range upper]), the system will return to the “Initial-
izing MPP” state and will recalculate the MPPT start voltage.
System stop When the “Key Switch Off” command is operated, the Grid side contactor
are turned off and the system stops. If the output power of inverter is kept
below value of “MPPT P stop” parameter during time of “MPPT T stop”
parameter, connection to the grid is terminated.