Fault Pilot Signal - Nuvation Energy NUV300-BC-12 Product Manual


Open wires are only scanned according to this period when the batteries are
connected to the DC bus during typical operation.
sc_linkbus.cell_open_wire_thresh
▪
The configurable count for positive open wire detections before the cell.open_wire flag is set
▪
This is to ensure noise triggered false positives are filtered
▪
Typically this is set to 3
sc_linkbus.cell_open_wire_max
▪
The configurable maximum count for positive open wire detections
▪
This variable is used to prevent windup of each channel's counter
▪
It also dictates how many Link Bus scan cycles should be used to collect enough samples to
detect open wires
▪
Typically set to 10 and cannot be less than sc_linkbus.cell_open_wire_thresh
sc_linkbus.cell_open_wire_ratio_lower
▪
The ratio below which the channel has an error, represented as an integer between 0 and
1000, (0 = 0.0, and 1000 = 1.0)
▪
Channels that have low ratios are indicative of high impedance connections between the cell
and channel input, possibly due to loose connections or bad terminals.
▪
Very low ratios indicate an open wire or a battery management system hardware failure
▪
Typically set to 800, representing 0.8
sc_linkbus.cell_open_wire_ratio_upper
▪
The ratio above which the channel has an error, represented as an integer between 0 and
1000, (0 = 0.0, and 1000 = 1.0)
▪
Channels that have high ratios are indicative of either short circuits or a battery management
system hardware failure
▪
This is typically 970, representing 0.97

7.10.4. Fault Pilot Signal

The Fault Pilot signal is signal internal to the Nuvation Energy BMS used to open the contactors
through a secondary control path in the case of a fault condition. When the system is faulted, the
Fault Pilot signal should be suppressed to guarantee the contactor coils are de-energized, regardless
of the state of the coil control software.
In most applications, this signal is a delayed version of the overall fault state of the BMS. This small
delay allows for the opening of directional contactors according to any delays configured as part of
the contactor output settings
In Nuvation Energy Low-Voltage BMS systems, the fault pilot is an internal signal on the Low-Voltage
BMS between the two MCUs.
Document ID: NE-PM-002
(Section 7.7.1).
130
Nuvation Energy Low-Voltage BMS - Product Manual
Rev 1.2, 2021-03-03
Curie Update 1