Instruction Manual PEL-4 Precision LED Sector Light Vega Industries Ltd Aug 2018
PEL-4 Precision LED Sector Light Page 7 of 69 Manual Version V1.06
however it will be useful for indicating significant intensity changes and verifying the
oscillating boundary function.
1.3 Automatic Flash Compensation
The PEL-4 is programmed for effective intensity. The effective intensity is automatically
compensated according to IALA E-200-4 to maintain a constant visible range regardless of
the flash character selected.
For rectangular flash characters the E-200-4 2017 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 PEL-4 has the full range of Vega flash characters available, plus a custom character
that can be defined by the operator. If oscillating boundaries are required, then it is
recommended to usea fixed character, or a character with a long-duration flash-on (such
as an occulting character) to avoid confusing the observer.
1.4 PEL-4 Intensity Specification
The PEL-4 is programmed for the required colour (red/green) effective intensity in
Candela. The white intensity will depend on the model of PEL-4. If the PEL-4 is a Uniform
White model then the white intensity will be approximately the same as (but never less
than) the programmed colour intensity. If the PEL-4 is a Bright White model then the white
intensity will be considerably greater than the programmed colour intensity (typically 3
times to 4 times brighter). The precise colour to white intensity relationships are described
in the tables in Appendix B and current consumption data is provided for each intensity
setting shown.
The PEL-4 is capable of operating in fixed character up to and including its maximum
intensity setting shown in the table.
Example 1: How to calculate the PEL-4 fixed character intensity setting and to calculate
the current consumption.
A PEL-4 is set to fixed character and a colour intensity setting of 200,000 candela is
required. Identify the appropriate value in the white intensity column, and read the
corresponding (colour intensity) value from the Prog Code column. This Prog Code should
be used in the intensity programming sequence for the PEL-4, using the TVIR Remote02.
Similarly, the continuous PEL-4 optical current drawn at this intensity will be read from the
Current column. The PEL-4 overhead currents shown at the bottom of the table can be
added to the optical value to obtain a final consumption figure. The red and green
intensities in candela can also be read from their respective columns.
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