Curtis Instruments 1351 User Manual

3 — PROGRAMMABLE PARAMETERS
pg. 35
Return to TOC Curtis Model 1351 – December 2018
SYSTEM CONTROLLER — BDI
PARAMETER ALLOWABLE RANGE DEFAULT DESCRIPTION
BDI Reading
BDI_Percentage
0x331D 0x00
0 – 100 %
0 – 100
Read Only Present BDI % reading.
The Battery Discharge Indicator (BDI) is the battery State-of-
Charge (SOC) as a percentage. The percentage is based upon
lead-acid battery chemistry and the associated parameters in this
BDI parameters menu.
Reset Volts Per Cell
BDI_Reset_Volts_Per_Cell
0x3246 0x00
0.900 – 3.000 V
900 – 3000
2.090 V
2090
The reset voltage level is checked only once when the
keyswitch is rst turned on. The BDI Reset Percent parameter
also inuences the algorithm that determines whether the BDI
percentage is reset to 100 % at key-on. This Reset Volts Per Cell
parameter should always be set higher than the Full Volts Per Cell
parameter (see the chart, above). This parameter is applicable for
lead-acid battery chemistry.
The Reset Voltage Level = Reset Volts Per Cell × number of cells
in the battery pack.*
Full Volts Per Cell
BDI_Full_Volts_Per_Cell
0x3247 0x00
0.900 – 3.000 V
900 – 3000
2.040 V
2040
This parameter sets the Keyswitch Voltage value that is
considered to be 100 % state-of-charge. When a battery (under
load) drops below this voltage, it begins to lose charge (lowering
the BDI percentage). The Keyswitch Voltage variable is also
viewable in the programmer’s Monitor » System Controller menu.
The Full Voltage Level = Full Volts Per Cell x number of cells in the
battery pack.*
Empty Volts Per Cell
BDI_Empty_Volts_Per_Cell
0x3248 0x00
0.900 – 3.000 V
900 – 3000
1.730 V
1730
The empty voltage level sets the Keyswitch Voltage value that is
considered to be 0 % state-of-charge.
The Empty Voltage Level = Empty Volts Per Cell × number of cells
in the battery pack.*
Discharge Time
BDI_Discharge_Time
0x3249 0x00
0 – 600 Minutes
0 – 600
34 Min
34
This parameter 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 keyswitch 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. Set this parameter based upon the
system’s typical duty cycle over which the battery is discharged.
The State of Charge Level = ((Full Voltage Level − Empty Voltage
Level) × BDI Percentage/100) + Empty Voltage Level.
BDI Reset Percent
BDI_Reset_Percent
0x324A 0x00
0 – 100 %
0 – 100
75 %
75
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 dene
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 (above) by the battery chemistry’s nominal volts-per-cell.
Lead-acid: 2.0 V/cell, nominal.

Curtis Instruments 1351 Specifications

General

Brand	Curtis Instruments
Model	1351
Category	I/O Systems
Language	English