Instruction manual

78
If a QUICKTRONIC
®
-ECG for T5/∅ 16m m-fluorescent lamps is operated
over long periods on a supply voltage greater than 280 V it may fail as a
result of overheating (with the exception of QUICKTRONIC
®
INTELLIGENT).
8.3 Equipment Behaviour
on Under Voltage
Important:
Significant under voltage can cause ECG failure for all ECG in constant
wattage circuitry. Due to the characteristics of arrangement the line current
increases for decreasing voltage. Below the specified voltage range this
causes an overload of the filter chokes. First the colour of the copper wire
and board below are changing. For a longer overload both windings of one
or both filter chokes fail due to melting or swelling in the windings.
Compact and straight fluorescent lamps go out below the specified value of
the ECG or even don’t ignite if voltage is too low. The ECG will not be
affected while the lamp is still burning. If the lamp is disabled at the end of
its life (i.e. emitter paste is wasted), the safety shut-down of the ECG
cannot work below the specified voltage range and a damage of the ECG is
possible.
8.4 Application faults
8.4.1 Wiring faults on the
lamp side
All single-lamp QUICKTRONIC
®
ECGs and units with 6-pole output
terminals:
If there is a wiring fault the lamp will not operate or will cold start. In
particularly serious cases there is a risk that the ECG will be destroyed.
8.4.2 Short-to-ground at the
output of
QUICKTRONIC
®
ECG
If there is a short-circuit-to earth at one or more of the connecting cables
between the ECG and the lamp, the ECG will fail.
Damage to the ECG:
• Melting and swelling of only one winding on one or both input filter
chokes
• Breakdown of one or two rectifier diodes, irrespective of whether
they are discrete or integrated components.
There are, however, other causes of these major faults. Generally, as a
consequence, consequential damage occurs at other components and this
damage need not be unique in character.
8.4.3 Effects of moisture
Rust at the edges of metal housings may indicate the effects of moisture. If
the printed circuit board and/or various components are tarnished, it can be
assumed that there has been a serious moisture ingress. There will be
short-circuits between neighbouring component connections or solder
points with high potential difference, resulting in failure of the ECG.
Symptoms of serious faults are indicated by a “tidermark” inside the
housing.
8.4.4 Installing luminaires
in draughty locations
Depending on the location of the fluorescent lamp in the draught, the lamp
will cool down in certain areas of the bulb. This leads to local depletion of
mercury and to a darkening of the lamp in these areas because there is no