4 — PROGRAMMABLE PARAMETERS
pg. 63
Return to TOC Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017
BATTERY MENU, cont’d
PARAMETER ALLOWABLE RANGE DESCRIPTION
Reset Volts Per Cell
BDI_Reset_Volts_Per_Cell
0x3170 0x00
0.900 – 3.000 V
900 – 3000
The reset voltage level is checked only once, when the main contactor
rst closes. Note that the BDI Reset Percent parameter also inuences the
algorithm that determines whether BDI Percentage is reset to 100%. Reset
Volts Per Cell should always be set higher than Full Volts Per Cell.
Reset Voltage Level = Reset Volts Per Cell × number of cells in the battery
pack.*
Full Volts Per Cell
BDI_Full_Volts_Per_Cell
0x3171 0x00
0.900 – 3.000 V
900 – 3000
The full voltage level sets the B+ (capacitor voltage) that is considered
to be 100% state-of-charge; when a loaded battery drops below this
voltage, it begins to lose charge. Capacitor Voltage is viewable in the
programmer’s Monitor » Battery menu.
Full Voltage Level = Full Volts Per Cell × number of cells in the battery
pack.*
Empty Volts Per Cell
BDI_Empty_Volts_Per_Cell
0x3172 0x00
0.900 – 3.000 V
900 – 3000
The empty voltage level sets the Capacitor Voltage that is considered to be
0% state-of-charge.
Empty Voltage Level = Empty Volts Per Cell × number of cells in the
battery pack.*
Discharge Time
BDI_Discharge_Time
0x3173 0x00
0 – 600 minutes
0 – 600
Sets the minimum time for the BDI algorithm to count down the BDI
Percentage from 100% to 0%. The BDI algorithm integrates the time
the ltered capacitor voltage is below the state of charge voltage level.
When that cumulative time exceeds the Discharge Time / 100, the BDI
Percentage is decremented by one percentage point and a new state of
charge voltage level is calculated.
State of Charge Level = [(Full Voltage Level - Empty Voltage Level) x BDI
Percentage / 100] + Empty Voltage Level.
BDI Reset Percent
BDI_Reset_Percent
0x3174 0x00
0 – 100%
0 – 100
When a battery has a high BDI percentage, its oat voltage at KSI On
can sometimes cause false resets. The BDI Reset Percent parameter
addresses this problem by allowing the user to dene a BDI Percentage
value above which the BDI Percentage variable will not reset.
When KSI is rst powered on, the BDI Percentage variable will reset
to 100% only if ((Keyswitch Voltage > Reset Voltage Level) and (BDI
Percentage < BDI Reset Percent)).
* To determine the number of cells in the battery pack, divide the Nominal Voltage setting (page 62) by the battery chemistry’s nominal volts-per-cell.
Lead-acid: 2.0 V/cell, nominal.
Note: For non lead-acid batteries, including Lithium-Ion battery packs, use the pack’s or cell manufacturer’s approved Battery Management System
(BMS) for determining BDI.
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