Operation
2–4
152379 Rev C
Operating States
A state machine implemented within the CCU2 control software governs the
operation of the PV100S with clearly defined transitions between its operating
states. There are five steady-state operating states and numerous intermediate
transition states.
•
Power Tracking
•
Transition
•
Shutdown
•
Fault
•
Manual Current
•
Matrix Test
•
Automatic Sleep Test
Power Tracking
This is the standard operating state of the PV100S. The PV100S maximum power
tracker will demand maximum power from the PV array, given sufficient PV
irradiance.
The user should be aware of the following conditions governing PV100S state
transitions:
•
Qualified utility voltage must be present for all states of operation.
•
Fault states are automatic from any state of operation. A fault will cause the
PV100S to immediately stop processing all power. The fault condition will be
reported to the operator interface LCD.
•
Most PV100S faults are latching and must be cleared at the operator interface
keypad before transitioning to another operating state.
•
The
ON
/
OFF
switch, located on the front door of the PV100S, must be in the
ON
position for all operating states except Matrix Test, in which case it must
be in the
OFF
position.
Transition
The intermediate transition states provide an orderly progression from one
operating state to the next. The user has the ability to manually transition the
PV100S between operating states via the operator interface keypad or remotely
using the GUI software. Manual transitions are initiated by entering a “Goal
State”, where the goal state is the desired operating state. Given all applicable
system parameters are within acceptable limits, and the request is valid within the
state machine, the PV100S will initiate the proper sequence of operations
necessary to progress to the requested goal state. Refer to Figure 2-1 on page 2–3
for an illustration of valid state transitions.
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