Instruction manual

77
8. Troubleshooting Tips
8.1 General 1) ECG in constant operation (24 hours)
Recommendation:
Installations with ECGs operating 24 hours a day should be
switched of each day for a few minutes.
Reason
When a lamp comes to the end of its life there is an increase in
lamp voltage causing an asymmetrical additional load in the ECG-
circuit. When exceeding a certain value this additional load shuts
down the ECG (EoL, T.2). When the ECG is switched on again all
the relevant values of the lamps are checked and “critical” values
can be detected.
2) Wiring of multiple ECG
Recommendation:
Lamp cables from different ECGs should not be routed together.
Raeson:
Mutual interference may lead to problems with starting and/or
normal operation (lamps may automatically disconnect)
3) Coding of the lamp cables
To speed up troubleshooting in luminaires and luminaire systems it
is extremely useful for the lamp cables to be uniquely coded (colour
coded or numbered). This applies especially to two-lamp ECGs and
even more so to 3- and 4-lamp ECGs since the large number of
cables increases the risk of connecting incorrectly.
4) Terminal blocks (2, 3, 4, 6 and 7 positions)
These terminal blocks are used with the majority of OSRAM ECGs.
Note that only single core cables with a cross-section of 0.75 mm²
to 1.5 mm² can be inserted without pressing the release tab. Larger
cross-sections are not recommended; the release tab has to be
pressed down for smaller cross-sections.
8.2 Equipment Behaviour
on Overvoltage
Appearance of the lighting system:
The lamps are of different brightness (from time to time).
Depending on the ECG type, the internal shutdown circuit will operate at
voltages above 280 V. In the event of a fault, the lamp generator will be
disconnected. The mains input circuit and various other sub-circuits,
however, continue to be supplied with this high voltage. If the mains voltage
increases further there will be changes in the operating characteristics of
the unit.
In most cases, this will lead to damage or destruction of the overvoltage-
sensitive varistor/protective diode, which in turn will cause the unit fuse to
trigger and damage to the unit.
If the system fault is corrected and the mains voltage has returned to the
specified tolerance range without damage to the unit, the unit can continue
to operate normally after an interruption in the mains supply and a recovery
time of typically 20 seconds. If the mains voltage continues to be high, the
unit will once again go into protection mode as soon as power flows to it.
Over short periods of time, this state does not usually damage the unit.