Guide to Starters Page 6 of 17
The bimetallic contacts cool down and open again.
The energy stored in the choke now discharges. (induction law)
A voltage pulse (U
max
) is generated which ignites the lamp.
Once the lamp has ignited only the lamp voltage (U
L
) is applied at the glow starter. This voltage is less than
the partial discharge inception voltage. It is so low that there can be no further glow discharge between the
bimetallic contacts.
The strength of the generated voltage pulse depends on a large number of parameters:
- the time of phase relation at opening
- the gas filling
- the speed at which the bimetallic electrodes break
Voltage pulses of 1000V up to 1500 V are achieved for igniting the fluorescent lamps.
4.3 Operating mode
As the voltage pulse is dependent on the phase relation (energy stored in the choke) there is a chance that
the lamps will not ignite despite good preheating of the lamp electrodes.
In this case, the glow igniter ignites again and repeats the preheating process and the ignition attempt – and
continues to do so until the lamp ignites.
The lamp voltage increases right up to the end of the life of the fluorescent lamp.
If the lamp voltage exceeds the closure voltage of the glow igniter the lamp is short-circuited and goes out. A
new ignition process then takes place.
If this behavior is repeated periodically in a short time the lamp will flicker or flash. This flickering may cause
damage to the control gear.
A large number of unsuccessful ignition attempts will cause the starter to age.
If a new lamp is operated with an old starter the new lamp will exhibit premature blackening at its ends due
to sputtering of the emitter on the lamp electrodes. This leads to accelerated aging of the lamp and therefore
to premature failure.
For this reason the starter must always be replaced together with the old fluorescent lamp.
4.4 Technical data sheets for starters ST 111, ST 151
The technical data sheets are given in section 10.
(168 pages)
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