2 Description of functions
page 3
ELC N6_N10-V3.1-09/11-GB subject to technical alterations
2
Description of functions
The electronic ballast ELC is designed to operate medium pressure discharge lamps as
described in chapter 6.
In contrast to conventional ballasts (inductive lamp ballast or transformer or transformer with
transductor), the lamp with an electronic ballast is operated with high frequency (approx.
100 kHz). The lamp does not flicker and dimming is infinitely adjustable to a range between
20 % and 100 % of the electric power or to between 15 % and 100 % of the UV radiation
respectively.
Dimming
The possibility of dimming the lamp has two advantages. Firstly the lamp can be switched to
minimum load (standby operation) during longer idle times and energy can thus be saved.
Secondly the optimum lamp power can be determined and adjusted as appropriate.
Power control
The ELC offers a high level of lamp power constancy due to its integrated power control.
Variations in operating voltage of
±
10 % do not affect lamp power.
Ignition device
When the lamp is switched on the ELC initiates trigger pulses to fire the lamp; a separate
ignition device is not required.
Other performance characteristics
•
High level of electrical efficiency.
•
The ELC has a network power factor of > 0.9. It can be operated directly at the network
without compensation.
•
The potential-free control inputs allow various lamp conditions such as maximum lamp
power, dimming or standby to be set.
•
The digital control inputs are designed for control voltages of between 10 and 30 V AC or
DC. Therefore ELC can be easily integrated into the installation’s electric system.
•
Lamp current and lamp power are continuously recorded and output as analogous
0-10 V signals.
•
The ELC monitors the lamp cables for earth fault.
•
The potential of both lamp outputs is separated from that of the supply voltage.
•
The ELC is both short-circuit proof and safe in open circuit operation at the lamp output.