DDA4-1000
V1.08
12
1. Functional description
The DDA4-1000 is a DIN-Rail mounted and DMX512 controlled 4
channel 250W trailing-edge dimmer for ohmic and capacitive loads.
It is especially designed for LED dimming / LED Filament light bulbs
for direct ac supply.
The DDA4-1000 (4x 250W) is the big brother of the DDA4 (4x50W)
and replaces the DDA4-800. Equal to the DDA4 we follow the same
target to reach lowest and repeatable brightnesses without
flickering and jumps.
With the adjustable lamp offsets for each channel, the minimum and
maximum brightness can be preset to the DMX512 value 1 and 255
as desired. Further on the control characteristic is selectable per
channel between logarithmic and linear.
Due to state-of-the-art circuit technology and the use of current
technology components, the total power dissipation could be
reduced to 3,5W @ 1000W load.
To be note, the dimming result of some LED Filament Bulbs and
many of LED Glass Spotlight Bulbs (GU10) may not be as wished.
The reason is the use of integrated power supplies at some LED
Bulbs. We recommend testing the LED-Bulb first.
Important notice:
When using LED filament light bulbs, a slight flicker may be
perceived under certain circumstances. This is no mistake of the
DDA4-1000.
The cause are centralized pulses (Rundsteuerimpulse), which are
fed into the Power Supply Network by the electricity suppliers (in
Germany). These pulses are used for controlling public electric
devices like Streetlights and so on. These signals are only for a few
seconds online but they cause voltage fluctuations which a LED
may visualize.