The Stack Switchgear is configured for a specific battery topology based on the
details provided to Nuvation Energy during order fulfillment. Failure to use the same
number of Cell Interface modules and/or using a different battery topology could
result in initialization issue and other undesirable behavior. Please contact
if there is a change in the system design that would
require a Stack Switchgear configuration update.
1. Missing or misconfigured Cell Interface modules, preventing the software from scanning for the
measurements
2. Misconfiguration on the number of Cell Interface modules. Refer to the register
sc_linkbus.cicount
(Note that Low-Voltage BMS is counted as a Cell Interface).
3. Failure in the Link Bus communication. Any interruptions of the bus can prevent the cell voltages
from being initialized. Such a failure could happen if:
•
Not all Cell Interface modules are connected
•
Link Bus cables are connected to the wrong port (i.e. Link Out instead of Link In).
•
Link Bus cables are damaged
10.1.2. Stack Voltage Faults
stack_fault_voltage_over
▪
Fault that is triggered when the stack voltage is above the
over
fault threshold.
stack_fault_voltage_hi
▪
Fault that is triggered when the stack voltage is above the
high
fault threshold.
stack_fault_voltage_lo
▪
Fault that is triggered when the stack voltage is below the
low
fault threshold.
stack_fault_voltage_under
▪
Fault that is triggered when the stack voltage is below the
under
fault threshold.
stack_fault_voltage_sum
▪
Fault that is triggered when the absolute difference between the measured stack voltage and
sum of all cell voltages in the stack exceeds the fault threshold.
10.1.2.1. Initialization Issues
These faults have the following initialization issues:
Fault
Initialization Issues
stack_fault_voltage_hi
. Stack Switchgear unit’s internal Power Interface module’s AFE is
disabled.
stack_fault_voltage_lo
stack_fault_voltage_sum
Same issues regarding cell voltage initialization issues (
)
Nuvation Energy High-Voltage BMS - Product Manual
Document ID: NE-PM-003
84
Rev 1.2, 2021-03-03
Curie Update 1
