Truesigns TAF

As received, the TAF was in good condition from being in storage for its entire life. There was a small amount of dust on the front, but once this was wiped off, the fitting looked as if it had just been removed from the box. Really, it is meant to be fitted to a column using two adjustable brackets; however, it can be wall-mounted if half of each bracket is removed.

The cover is held in place with two 4 mm hexagonal screws; a locating pin on top of the unit ensures that the top of the cover cannot slip forwards. Originally, the fitting was key-operated; however, the keys have been lost over the years and so I bypassed the key switch (the object located at the lowest point of the fitting) and have the fitting running manually instead. The visible circuitry is fairly simple - two 60 W GLS lamps are positioned at either end of the fitting. An electronic Royce Thompson flasher system (carrying an internal manufacturing date of 1994) is employed to flash the two lamps on a pre-programmed sequence.

Fast-forward to 2019, and the 60 W tungsten lamps have been replaced with 7.5 W LED retro-fit lamps; the video below demonstrates the operation of the TAF unit.

Testing with my energy monitoring device revealed the following results:

Test Voltage (V) Current being drawn at full power (A) Measured wattage (W) Apparent Power (VA) Frequency (Hz) Power Factor True Power (W) Difference to rated wattage Percentage Difference
253.1 0.07 10 18 50 0.54 9.57 2.07 27.56%

Examples of this type of School Crossing Flasher in-situ can be seen below:

This is the only TAF I knew of in Derby. It didn't look to have a key switch fitted - maybe this was removed when the keys were lost!

(The fitting has, subsequently, been replaced with a Microtima unit with LED clusters instead of the tungsten lamps.)


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