EZA2500 Series
TDK-Lambda
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6-2.
Automatic Grid CV mode
Grid voltage is maintained at set target voltage.
If grid voltage is lower than the target voltage :
Regeneration Operation
B
Discharge
C
If grid voltage is higher than the target voltage:
Generation Operation (Charge)
There is a dead zone (power conversion non-operational
band) which can be set between regeneration voltage level
and generation voltage level.
Constant current control is for grid side current both
generation operation and regeneration operation.
For generating operation and regenerating operation the
target current value can be set separately.
6-3.
Automatic Grid CV with Battery CC mode
The basic actions of this mode is same to Grid
Automatic CV Mode. Constant current is controlled by
battery side current.
Also, it is possible to set battery over-charge and over-discharge protection that stops charging and discharging process
when battery voltage level reaches the target voltage level. (Refer to 7.Battery Protection)
For the Output Side (Grid Port), 300V or more pre-charge is required. When external voltage is not applied, this
converter will not operate.
7/22
Target Grid Voltage
Vgrid
Ibat
Grid Under Voltage
Grid Over Voltage
ShutDown
ShutDown
Regeneration
(Discharge)
Generation
(Charge)
Battery Limit Current
Battery imit Current
0
Operating Characteristic
Deadzone
Deadzone Upper Limit Voltage
Deadzone Lower Lomit Voltage
Converter
320V (HVDC)
48V (LVDC)
Output
(Grid)
Input
(Battery)
Generation
(Charge)
Regeneration
(Discharge)
Ibat
Vgrid
Converter
320V (HVDC)
48V (LVDC)
Output
(Grid)
Input
(Battery)
Generation
(Charge)
Regeneration
(Discharge)
Igrid
Vgrid
Target Grid Voltage
Vgrid
Igrid
Grid Under Voltage
Grid Over Voltage
ShutDown
ShutDown
Regeneration
(Discharge)
Generation
(Charge)
Grid Limit Current
Grid Limit Current
0
Operating Characteristic
Deadzone(*)
Deadzone Upper Limit Voltage
Deadzone Lower Lomit Voltage
*Deadzone : Converter is held in equilibrium operation
that no operation neither generate nor regeneration.
