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Operating principle and hardware description 17
I-V characteristics
The I-V curve is not constant since intensity and temperature changes during day time.
Under constant temperature, current changes linearly with intensity and voltage changes
logarithmically with intensity. Since the voltage variation is small with respect to intensity
changes, maximum power varies proportionally with intensity.
Dual supply mode
The solar pump inverter operates in dual supply mode either with a three phase input
supply from the grid or with DC input supply from PV cells. A four-pole changeover switch
enables switching between the two supply modes. At a given time only one supply (PV cell
or grid) will be connected to the drive.
Note
: Use two poles of the changeover switch in series to ensure that the voltage applied
across each pole is half of the full DC voltage.
8
6
4
2
10
200
400
600
800
Vpv
n
0
Iact
n
Pkw
n
PV cell
4-pole change
over switch
Solar pump
inverter
Motor and
Pump
ce
Grid supply
To inverter (Brk+, Brk-)
To inverter U1, V1, W1
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives Supplement ACS355 Solar pump inverter N827...
Page 4: ......
Page 10: ...10 Safety...
Page 14: ...14 Introduction...
Page 18: ...18 Operating principle and hardware description...
Page 30: ...30 Start up and controls...
Page 36: ...36 Program features...
Page 66: ...66 Actual signals and parameters...
Page 70: ...70 Fault tracing...
Page 76: ...76 Technical data...