KACO Powador XP500-XP550-HV TL outdoor - Manual (Page 29)

Page 30 Operating Instructions Powador XP500/550-OD-TL
S t o r a g e / I n s t a l l a t i o n / S t a r t - u p
5.6 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!
5.6.1 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 PV array and the utility grid.
Connecting to the PV array When the inverter is in the “Disconnected” state, the ‘Key Switch On’ com-
mand is operated and the PV voltage is kept above 400V for 5 seconds, the
system turns on the PV Array side contactor (PV_MC).
Connecting to Grid When the inverter is in the “Connecting to PV Array” state and the PV volt-
age 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 is off, the PV Array side contactor and 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.
Table 4: Operating states