ARRI EB 575 Operations Instructions Page 14

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_______________________________________________ English _____
- 13 -
LICHTTECHNIK
4. Start-up procedure
All operating controls and cable connections are arranged on the front panel
(see fig. 2, page 18).
4.1 Energizing System
Check "Lamp" Switch to be in "O" position.
Connect the properly checked daylight luminaire with head to ballast cable to the
electronic ballast. The total length of head to ballast cables must not exceed 100 m.
Connect the electronic ballast to the power supply source.
Ensure main circuit breaker is in "ON" position
Check earth protection. If correct, the green LED "PE" on Front plate illuminates. If
not, disconnect EB from mains (pull out line plug) and check power supply and
socket (Ref. 2.2 on page 10)
The nominal power of the connected lamphead is detected automatically.
On the right side of the lamp connector two LEDs indicate the detected power of the
lamphead.
Set "Lamp" Switch to "I"-position as well on the EB as on the head.
Lamp will ignite after about 3 sec.
If the "DMX" LED is lit, the ballast is switched on by remote control. In this case the
ballast cannot be switched off by use of the "Lamp" switch.
The yellow LED "LAMP" on front plate is lit after successful ignition.
4.2 Control of light intensity
After warming up, the light intensity of the metal halide daylight-lamp may be controlled
by the dimming potentiometer (stepless). The nominal lamp power can be adjusted
between 50 - 100% (left stop = MIN, right stop = MAX of power).
If the ballast is controlled by remote control ("DMX" LED is lit) the dimming
potentiometer at the front plate is disabled.
4.3 Reduction of lamp noise
When metal halide daylight lamps are operated in the flicker free mode some noise
might occur, due to the special square-wave operation of the lamp.
1. In the “low noise” settings "LN 50 Hz" resp. "LN 60 Hz" (red LED indicating lights)
the noise will be substantially reduced, the amount depending on the lamp, in some
cases even to almost zero.
The light, however, is NOT flicker free any more.
When operating in this mode, the same limitations for speed of camera and/or shutter
angle apply as for magnetic ballasts operating at 50 Hz (24/25 fps) bzw. 60 Hz (30
fps). All other advantages of the electronic ballast will apply as before!
2. In the “Flicker Free” position "FF 75 Hz" (green LED indicating light) the electronic
ballast will operate flicker free, the lamp gives out a constant light.
3. In the “Flicker Free” position "FF 1000 Hz" (white LED indicating light) the
electronic ballast will operate flicker free, the lamp gives out a constant light. This
mode is specially designated to achieve high resolution pictures when using digital
cameras with high frame rates.
If in doubt (i.e. remote from ballast) with the flicker analyzer P.R.O.F light can be
checked to be flicker free or not.
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