Analogue

Analogue dimmable control gear can dim light sources from 100% to the minimum allowed by the individual piece of control gear. This minimum is dependant upon the manufacturer and range, it can vary from 1% to 3% of the light source power.

Analogue dimming with regards to light source drivers can not turn the lamp off from the control signal. Turning the light source off involves turning the power off to the luminaire.

Advantages

  • Simple
  • Easy to install
  • Inexpensive controllers
  • Minimal commissioning or setting up required

Disadvantages

  • Wiring has to be either segregated or screened from the mains supply cable
  • Can not switch light source off from control gear
  • Limited control from more than one position

Cabling

As analogue dimming uses a low voltage signal to dim the lamps, the control cables have to be screened or segregated from the mains cables. Mains switching can interrupt the low voltage control and cause the luminaires to flicker in response to mains borne interference.

As the lamps can not be turned off from the control signal (only dimmed down to minimum) there has to be some sort of switch to turn the power off to the luminaire.

Analogue Wiring Diagram

Control from more than one location is possible but the installation would have to have a change over switch to pass the control voltage from one controller to the other. You can only control the luminaires from one position at a time.