Alencon SPOT: Installation,
Operation, and Maintenance Manual
40 |
P a g e
10.1.1 STATES:
SHUTDOWN
From any state the DCDC can be transferred into SHUTDOWN state upon receiving a
Shutdown
command. In the SHUTDOWN state the operation of the DCDC is ceased and transfer of power
is stopped. The enable flag is set to 0. The DCDC stays in the SHUTDOWN state until a
System
Reset
command sets the enable flag = 1.
STANDBY
The DCDC converter is not producing power. It is ready to produce power but not all
startup
limits
are satisfied, or
control mode
has not been set. Does not require
System Reset
to exit.
INIT
The microcontroller is initialized. It checks whether, enable flag = 0 (state to SHUTDOWN) or
enable flag = 1 (state to RUN)
STARTUP
In the STARTUP state, the DCDC prepares the load for the RUN state. First the DCDCs charge
the connected output BUS (inverter and other connected electronics) to the operating voltage
defined in the configuration file. When
run limits
are satisfied, the DCDC transitions to the RUN
state unless a fault occurs mid-transition.
RUN
Operates at full power constantly adjusting for MPPT. Or operates in current/power control
mode, maintaining a consistent setpoint as requested from the controller.
LIMITING
_ON
If
curtailment
is enabled and the DCDC is operating within the predefined
curtailment limits
, the
DCDC will go to LIMITING_ON status. DCDC continues to operate at reduced power
throughput, according to the application specific droop curve that has been pre-configured. If
operating conditions return to standard
run limits
,
the DCDC will return to RUN status.
For more information see the Alencon Whitepaper on DCDC curtailment.
TRIPPED
If, while in RUN or LIMITING_ON status, voltage, current or temperature exceed the pre-
configured limits on any DCDC (i.e., hit a
trip condition
) it will enter TRIPPED state and move
automatically to INIT state. When TRIPPED state is entered, the DCDC stops all power
conversion. Entering TRIPPED does not remove the c
ontrol mode
or set the enable flag = 0.
