Because the dimming principle of each dimming system is not the same, they are widely used in the market, and have their own dimming characteristics, the following matters need to be clear when the project construction wiring:
(1) The wiring mode of a specific area shall be strictly corresponding to the project design scheme to design the dimming scheme of the area. For the dimming scheme adopted in the project, wiring construction training shall be done with site construction personnel in the early stage;
(1) The wiring mode of a specific area shall be strictly corresponding to the project design scheme to design the dimming scheme of the area. For the dimming scheme adopted in the project, wiring construction training shall be done with site construction personnel in the early stage;
(2) It is clear that the lamp type of the lamp supplier should conform to the designed dimming scheme, and the dimming driver can be compatible with the dimming actuator in the system.
(3) Check the actual number of lighting loops on the construction project site, which should be different from the switch lighting loop. The loop should be labeled to facilitate future line checking, installation and debugging;
(4) Confirm the number and power of dimming lamps connected to each loop, and make preparations for the model selection of dimming actuators and the balance distribution of three-phase electricity in the later stage;
(4) Confirm the number and power of dimming lamps connected to each loop, and make preparations for the model selection of dimming actuators and the balance distribution of three-phase electricity in the later stage;
The following four kinds of dimming methods are described respectively.
1) Forward/rear cutting dimming control
Before cutting the dimming control (leading edge cutting phase modulation light) for use on market at present most dimming control mode, also known as silicon controlled LED dimmer ，after cutting the dimming (Trailing edge) or MOS tube light given the dimming of the MOS tube cost price is high, with a small, market need special indicate when involved in such demand that move light, you need to specify the KNX manufacturer of MOS tube dimming actuators, But the wiring construction is the same as the pre-cut dimming, do not do separately).
The dimming principle of the switch forward dimming control is to change the input voltage in the circuit by the thyristor signal. The switch in the thyristor electrical appliance can adjust the internal resistance value, thus changing the conduction Angle of the thyristor, when the conduction Angle of the thyristor changes, the sinusoidal wave of the input voltage will produce deviation, the effective value of the voltage will become larger or smaller, and the brightness of the lamps and lanterns will change accordingly.
According to the dimming principle mentioned above, additional precautions for THYristor dimming wiring are as follows:
1. The zero wire in the dimming circuit must be arranged separately, and it is strictly prohibited to be co-zero or co-fire with other circuits.
2. A single LED lamp is best to use a single 0-10V driver, the driver and 0-10V debugging before the compatibility and matching work. If there are more than one lamp wiring mode in a loop, the multiple drivers arranged separately are connected in parallel for overall dimming.
3. Determine the type and rated power of lamps to match the corresponding universal dimmer switch actuator, and match the thyristor driver with the relevant suppliers.
The pros and cons of front cutting dimming
Advantages: Mature and stable technology, low dimming cost, strong compatibility, compatible with the original line, no need to re-wiring, simple installation.
Weakness: due to the principle of which destroyed the sine wave waveform, non sinusoidal waveform increase harmonic coefficient, and the disturbance signal at the same time, may produce certain current noise when using, dimming performance is bad, often leads to the dimming range, and can lead to minimum load is more than a single or a few LED light power rating. Because of the property of SCR half control switch, it can only turn on the current function, but cannot turn off the current completely. Even if it is adjusted to the lowest level, there is still a weak current through, and the LED micro current luminescence feature makes the PHENOMENON of weak light still exists after the SCR dimming is turned off.
