Victor,
I have seen this wiring scheme on electronic ballasts before. The
YELLOW wires are connected internally, linking together all of the
leads shared by the remote and the primary lamp. The remote lamp is
optional. When using only 2 lamps, you would ignore the YELLOW dashed
leads and wire the RED heater wires to the primary. I cannot swear that
this is the case, however.
I have wired up an ADVANCE REL-2S110 in a very similar manner, although
the ballast wire colors are different. The REL-2S110 has a BF of 1.15
if operating 2 F48T12HO's, so I tried it with 3 lamps, directly tying 2
lamp ends together.
I was once sent a diagram of a Rapid Start European ballast (Tridonic?)
which was also wired like the Motorola diagram.
Thanks Ron. If the wiring is correct then one of the
electrodes in each of two of the lamps operates without
external heat. This should shorten the life of the
electrodes, except that many rapid start lamps are also
rated for instant start operation. Heating the electrode at
one end of the lamp will allow the discharge to be started
with a moderate open circuit voltage. Once a discharge has
been established, the ballast seems to have enough voltage
to swap cathode and anode even though the new cathode is
still cold. I have never seen data from a cycled life test
of lamps operated in this manner. Perhaps others have and
can point to the data.
--
Vic Roberts
http://www.RobertsResearchInc.com
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