English
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The resonance frequencies change with the lamp temperature. Therefore, it
is advisable to operate the lamp until the thermal steady state condition
(approx. 10 minutes) before searching for the operating frequency.
Since also the dimming of lamp power influences the resonance
frequencies, the desired dimming value should always be set before
searching for a non-resonant frequency!
To operate the lamp at a resonance free frequency the ballast provides three
different methods:
a) MAN
In the "MAN" position the resonant-free frequency can be adjusted manually.
The "MIN / MAX" frequency knob can be used to set the frequency in the
range of 270 Hz (min) to 360 Hz (max) or 900 Hz (min) to 1200 Hz (max).
The frequency is displayed at the LED display.
b) AUTO MAN
In the "AUTO MAN" position the initial frequency is adjusted manually by use
of the "MIN / MAX" frequency knob. During operation, the electronic ballast
constantly analyzes the lamp current to detect beginning resonances. In this
case the frequency will be automatically readjusted to stay in the resonance-
free range.
c) AUTOSCAN
In the "AUTOSCAN" position, the search for a non-resonant operation
frequency is done fully automatic. After the warm-up phase of the lamp, the
electronic ballast is automatically searching for an initial frequency that
operates the lamp quietly. This scan process may take up to four minutes.
While the scan is running, the "AUTOSCAN" LED flashes and the actual
frequency is displayed at the LED display.
Note:
During the automatic scan for the initial frequency a change of the
dimming value will restart the scan process!
During following operation, the ballast continuously analyzes the lamp
current to detect beginning resonances. In this case, the frequency is
automatically readjusted to stay in the resonance-free range.
Note:
If in doubt, the flicker analyzer P.R.O.F. can be used to check the light to
be flicker-free or not within a few seconds.
4.4 Remote Control DMX-512
The electronic Ballast EB MAX 2,5/4 can be controlled by use of a remote
control according DMX 512 standard.
To operate the ballast by remote control, the ballast’s ON/OFF switch must be
in
"0"
(OFF) position! In case of remote operation the dimming potentiometer
and the F-Mode tip switch at the front panel are disabled.
In case of failing DMX signal (e.g. interrupted cable), the ballast operates
according to the last received values. In order to switch back to manual control
at the ballast, the device must be temporarily disconnected from mains (for
example, by switching off the main circuit breaker).
Note:
The DMX remote control connections are separated from the mains by
double insulation. The potential of the remote control signals at the connectors
may not exceed 70 Volts (peak) against protective earth.
