Instruction Manual PEL-4 Precision LED Sector Light Vega Industries Ltd Aug 2018
PEL-4 Precision LED Sector Light Page 25 of 69 Manual Version V1.06
8.0 FLASH CHARACTER MODES
The default mode is to have one flash character. This should be the same as what is
indicated on marine charts.
8.1 Flash Compensation Modes
The PEL-4 is capable of generating several different flash characteristics. The IALA E-200-
4 2017 flash compensation algorithm is enabled by default. Additionally, a peak intensity
during flash mode is available in which no flash compensation is applied. Lastly, an historic
IALA E-200-4 2008 flash compensation algorithm can also be programmed.
These modes are selectable using the third digit of the special set flash mode command:
Operation =Special =7
Feature =Set Flash Mode =2
Value =Select from Appendix A =XYZ (X & Y are independent of this
mode)
X is presently always 0. Where the third digit, Z, is the value controlling the flash
compensation mode.
These flash compensation modes are compatible with all other PEL-4 modes.
8.1.1 IALA E-200-4 2017 Effective Intensity Mode (Default)
The IALA-recommended Modified Allard or Schmidt-Clausen flash compensation algorithm
is implemented when the effective intensity flash compensation mode is enabled. For
rectangular flash characters the Modified Allard algorithm resolves to the Schmidt-Clausen
algorithm shown here. Where each flash on period (f) within a total flash character is
compensated by a factor (SC) according to its individual duration, as per:
SC = (f + a)/f
For the default compensation compliant with E-200-4 2017, during night, the applied flash
compensation formula uses the Schmidt-Clausen constant of a=0.1s. During the day
a=0.1s is always used.
For the alternative E-200-4 2008 algorithm, during night, the applied flash compensation
formula uses the Schmidt-Clausen constant of a=0.2s. During the day a=0.1s is always
used.
When flash compensation is disabled, a = 0, in the above formula, meaning that SC = 1.0.
The default, E-200-4 2017 effective intensity mode can be selected as follows:
Operation =Special =7
Feature =Set Flash Mode =2
Value =Select from Appendix A =XY0 (X & Y are independent of this
mode)
X is presently always zero. Y is independent and defines the auxiliary and special flashing
mode as described in the previous section.
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