Open Shunt Detection And Diagnostics - Nuvation Energy NUV300-BC-12 Product Manual

▪
Disabling this fault will prevent the BMS from tripping a fault if the stack controller subsystem
detects that the power interface subsystem clock is out of sync
▪
Typically set to 1
pi_clock_check.enabled
▪
Setting to 1 enables clock checking on the power interface subsystem
▪
No fault is associated with this feature and the power interface subsystem will directly
disconnect the contactors if a clock error is detected
▪
Typically set to 0

7.10.7. Open Shunt Detection and Diagnostics

Nuvation Energy BMS is capable of detecting improperly installed, loose, or disconnected sense wires
that are used to measure the stack voltage and stack current by tracking the correlation between the
two measurements.
stack_open_shunt_detector.enabled
▪
Set to 1 to enable the open shunt detection algorithm
stack_open_shunt_detector.current_activity_threshold
▪
Current measurements above this threshold are used for tracking the correlation between
stack voltage and stack current
▪
Typically set to the same value as the stack_short_shunt_detector.current_activity_threshold
register
stack_open_shunt_detector.minimum_resistance_threshold
▪
The threshold value below which resistance estimates are considered faulty
▪
Setting this parameter requires knowledge of the cell resistance (R
cells connected in series for a stack (N
▪
A typical value, reported in μΩ, can be calculated based on the equation below
stack_open_shunt_detector.filter_sample_count
▪
This register is used to adjust how much noise is filtered out to prevent false trips due to noisy
signals
▪
A higher value will result in a greater amount of filtering
▪
Typically set to 10
stack_fault_open_shunt.thresh
▪
The minimum percent of faulty samples required to trip an open shunt fault
▪
These faulty samples are current and voltage measurements that do not correlate with each
other
Document ID: NE-PM-002
Nuvation Energy Low-Voltage BMS - Product Manual
)
cell
132
) in μΩ and the number of
c
Rev 1.2, 2021-03-03
Curie Update 1