In many cases the dimming range of the power supply or ballast is limited.
0 10v dc power supply.
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Led power supplies 120 277 vac 90 efficiency rectangular aluminum case high performance tri mode dimming forward reverse phase 0 10v 1 100 dimming range 30 w max programmable 250 to 500 ma iout 42 v max vout.
The first and simplest electronic lighting control signaling system low voltage 0 10v dimmers use a low voltage 0 10v dc signal connected to each led power supply or fluorescent ballast.
Low voltage dc control systems became the choice for many systems because of it s safety and flexibility.
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Each dimmer had a dedicated control wire or pair of wires.
If the light output can only be dimmed from 100 down to 10 there must be a switch or relay available to kill power to the system and turn the light.
0 10v precision is 0 01v rotate the encoder knob to adjust output voltage can be calibrated.
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Often dimming ballasts and dimming led power supplies use 0 10v control signals to control dimming functions.
Many different low voltage systems were used 0 10v 0 15v 0 24v 0 10v etc were used but over the time 0 to 10v became the most common.
At 0 volts the device will dim to the minimum light level allowed by the dimming driver and at 10 volts the device will be operating at 100.