2
Description of functions
page 3
ELC X-Series-V1.3-09.16-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), with an ELC the lamp is operated with high frequency (approx. 100 kHz). The
lamp does not flicker and dimming is infinitely adjustable within a wide power range (see
chapter 6).
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 400-480V
±
10 % do not affect lamp power. Between 310-
360V a reduction of output power according to chapter 6 has to be taken into account.
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.
•
Low harmonic distortion of the mains current due to integrated power factor corrector.
•
Configuration, control and monitoring of the ELC is carried out via PROFIBUS-interface.
•
The ELC monitors the insulation resistance of the lamp output wiring (earth fault control).
•
The potential of both lamp outputs is isolated from that of the supply voltage.
•
The ELC is both short-circuit proof and safe in open circuit operation at the lamp output.