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The under-voltage lockout trigger itself does not shut down the BMS when the stack
voltage drops below this level. The Low-Voltage BMS has built-in power switching
hardware that can be driven off of this trigger. Refer to
details.
The stack voltage thresholds can be configured in a similar manner to how the cell voltage thresholds
(Section
7.5.2) are configured.
User-defined triggers are also available for high and low stack voltages.
Register
stack_trig_voltage_hi.thresh
stack_trig_voltage_lo.thresh
Since stack voltage is measured independently from individual cell voltages in Nuvation Energy BMS,
another important configuration threshold is the limit for mismatch between the overall stack voltage
measurement and the sum of individual cell voltages.
stack_fault_voltage_sum.thresh
▪
The upper limit of the operating voltage mismatch zone
▪
Set
as
per
stack_fault_voltage_over.thresh)
7.5.6. External Controller Heartbeat
Nuvation Energy BMS can be configured to require a heartbeat signal from an external controller in
order to keep the stack online and out of fault state. A write to the MESA controller heartbeat register
is expected at least once during the watchdog period. If a multi-stack controller—such as the
Nuvation Energy Multi-Stack Controller or Nuvation Energy Battery Control Panel—is in use, it can
periodically write to this register to keep the stack out of fault state.
sc_controller_wdt.period
▪
Trip time for watchdog if heartbeat disappears
▪
Set to 5 seconds or as per application requirements
sc_fault_controller_wdt.disabled
▪
Set to 0 to enable controller watchdog
▪
Set to 1 to disable controller watchdog
If this feature is not used, the watchdog fault should be disabled.
7.6. Control Settings
Nuvation Energy BMS controls the current flowing through a battery stack:
Document ID: NE-PM-002
Table 17. User-Defined Stack Voltage Triggers
Setting
User-defined high stack voltage trigger.
User-defined low stack voltage trigger.
application
requirements
Nuvation Energy Low-Voltage BMS - Product Manual
(typically
104
Section 7.10.5
for more
at
least
5–10%
Rev 1.2, 2021-03-03
Curie Update 1
of
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Troubleshooting
