stack is
. In another example: a 4 stack system which cannot operate unless all 4 stacks are
pack_fault_ready_stacks.thresh = 3
. This indicates that if only 3 stacks were
a single stack had faulted) it is considered a pack fault and should stop operating. In general the
formula for this is: (minimum ready stacks - 1).
8.6.2. Pack Full and Empty Conditions
The Battery Control Panel provides an aggregate of the SoCs for all stacks in the pack by reading
either the Modbus point
801 SoC
or register
pack_charge[0].soc
. It is assumed that the SoC
configuration for each stack is the same. Refer to your stack-level
Product Manual
for details on stack
SoC configuration.
A battery pack can be determined to be full or empty using the following conditions of the pack SoC
data:
▪
That all stacks are at 0% SoC when the pack SoC reads 0%. Otherwise the pack SoC remains at
1%.
▪
That all stacks are at 100% SoC when the pack SoC reads 100%. Otherwise the pack SoC
remains at 99%.
The full/empty pack condition noted above is specific to Curie Update 2 release.
It is assumed that all stacks have similar capacity and usage to use this
measurement for charging/discharging a battery pack. If the stacks are imbalanced
in capacity or SoC, relying on the pack SoC measurement could
overcharge/discharge the battery stacks. If the battery stacks are properly
configured, the battery management system firmware will protect the stacks if such
an over charge/discharge were to happen.
8.6.3. Communication Safety
Pack level communication must be stable and error free to ensure the battery is safely operating.
Faults are tripped if any of the
stack’s Ethernet bridges experience connectivity issues. Fault
behavior is tuned using the following trigger registers.
gbc_fault_eth_conn.thresh
▪
The threshold that is tripped when a bridge fault occurs.
gbc_fault_eth_conn.time_hyst
▪
The microsecond duration that the fault must be present before it trips.
gbc_fault_eth_conn.end_time_hyst
▪
The microsecond duration that the fault must be cleared before it resets.
Nuvation Energy Battery Control Panel - Product Manual
Document ID: NE-PM-005
72
Rev 1.1, 2020-10-14
Curie Update 2
