User manual

Introduction
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Optimization of the PV225S MPPT will result in an increase in energy production.
The user is encouraged to study the PV array’s I-V curves and to adjust the MPPT
user settable parameters accordingly.
Dynamic DC Minimum Operating Voltage
The PV225S employs a unique approach to the minimum DC input voltage for
operation. The CCU2 constantly monitors and calculates an average of the AC
utility input voltage, thereby adjusting the required minimum DC input voltage
threshold to optimize the sinusoidal AC output current waveform. Given a
nominal input voltage of 208 Vac, the minimum DC input voltage threshold is
300 Vdc. On a transient basis, the PV225S does have the ability to adjust the
minimum DC input voltage threshold to less than 300 Vdc.
Utility Voltage/Frequency Fault Automatic Reset
In the event of a utility voltage or frequency excursion outside of preset limits, the
PV225S will stop operation and display a fault at the operator interface. Once the
utility voltage has stabilized within acceptable limits for a period of at least
5 minutes, the PV225S will automatically clear the fault and resume normal
operation. Voltage and frequency fault setpoints are detailed later in this section.
Figure 1-1 Maximum Peak Power Tracking