Instruction Manual PEL-4 Precision LED Sector Light Vega Industries Ltd Aug 2018
PEL-4 Precision LED Sector Light Page 22 of 69 Manual Version V1.06
5.6 Battery Thresholds
The PEL-4 has programmable battery threshold settings designed to protect a battery from
damage by being over-discharged.
The PEL-4 protects the battery from low voltage damage and will switch off when the
programmed low threshold is reached. This feature also protects the PEL-4 from over-
current damage (since the current drain will increase as the battery voltage reduces to
maintain constant power input). This feature can be disabled if not required.
If the low battery threshold is set to any value other than zero, then if the PEL-4 detects
three consecutive voltage readings less than the programmed low voltage threshold, it will
turn off. The PEL-4 will turn off under this condition in both fail-safe and best-effort
operational modes. While the PEL-4 is off, it will generate an alarm output condition.
Normal operation of the PEL-4 will be resumed once the battery voltage exceeds the
battery high threshold value.
For a nominal 12V battery supply, the default threshold values are 11.0V for the low
voltage threshold (110), and 12.8V for the high voltage threshold (128). For a nominal 24V
battery supply, the default values are 22.0V for the low voltage threshold (220), and 25.6V
for the high voltage threshold (256). A dual-voltage product will be shipped with 12V
settings and these can be adjusted anywhere in the combined 12 and 24V ranges. Setting
the low voltage value to 999 will disable this function of protecting the battery. Note,
however that the PEL-4 will always turn off when the input voltage is either too low for it to
function correctly, or below the input current demand of the PEL-4’s design specification.
Setting the high voltage threshold to 999 will reset it back to the default value.
6.0 PERFORMING SYSTEM CHECKS
The PEL-4 firmware contains both manufacturing and real-time information that the user
can retrieve for identification or diagnostic purposes.
Information that can be requested includes:
Software version (3 digits);
Battery/supply voltage
Temperature reading (3 digits, °Kelvin, subtract 273 to obtain °Celsius.);
Current adjustment (always reads ‘100’, which means 100%, or no adjustment);
Serial number (8 digits);
Characterisation number (4 digits, refers to the LED+optical calibration. Consult
Vega if more information is required);
GPS detected (‘001’ if daughterboard detected and GPS lock obtained).
See the System Checks portion of the generic programming commands described in
Appendix A.1 for the full list of data available.
For example the PEL-4 provides a reading of the supply voltage as a quick means of
checking battery voltage.
Operation =Read Only =3
Feature =Input Voltage =1 (see Appendix A for others)
Value =Series of flashes providing the requested value.
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