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starting process again until the lamp ignites. If the lamp will not ignite
(end of life) the starter will continue producing peaks (flickering) until
the mains voltage is switched off or until the electrodes of the glow-
switch starter stick together.In the latter case the short-circuit
current is continuously running through the lamp electrodes, which
can be seen at the glowing lamp ends.
Once the lamp is properly ignited, the lamp voltage is too low for a
glow discharge between the starter electrodes. So these electrodes
stay ‘cool’ and in open position.
A capacitor across the starter electrodes prevents radio-interference
of the lamp.
There are five types of glow-switch starters, specified for a certain mains
voltage and/or lamp wattage ( S2-10-11-12-16).There are also resettable
glow-switch starters: SiS2, Si S3 and SiS10.These starters switch off
after a certaintime in case the lamps do not ignite and have to be
reset manually by a push button. Switching the mains supply does not
reactivate a switched-off resettable starter.
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Fig. 106.Working principle of a glow-
discharge starter circuit.
1.The heat from the discharge in the
starter bulb causes the bimetallic
electrodes to bend together.
2.When the bimetallic electrodes make
contact, a current starts to flow through
the circuit, sufficient for preheating the
electrodes of the fluorescent lamp.
3.The bimetallic electrodes cool down
and open again, causing a voltage peak,
which ignites the fluorescent lamp.
2.2 Starter types
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