In any public building, there are lots of public rooms, such as libraries, computer rooms, lounges, workout rooms, meeting rooms and so on; for these require a simple but effective control system.

Meeting Room

Meeting Room





Problem Analysis

open/restricted rooms, best management method

For these common rooms there are those that are open (e.g. libraries), and there those that are restricted (e.g. meeting rooms), what simple and effective way is there to manager their energy use?

occupant leaves - lights and a/c still on

Often encountered is the problem of the last occupant leaving but both the lights and a/c are left on; which results in much wasted energy and thus becomes the focal point of any energy conservation measure.

idle period - roaming needed

During idle periods, such as late nights and holidays, it is desired to have some way to administer them but without having to roam around to operate them.

System Diagram

The ACS can forcibly control the lights during busy periods; at other times, the local controls are authorized and control reverts to th local switches or sensor, the user is then allowed to manually control the lights.

3 Solutions

(A) Card Key Method

(B) Local Switch + Preset Off

(C) Energy Saving Control Method

(A) Card Key

Central control + card key

Managed Use With a Card Key and Central Host

  • Example: Library individual reading room or recreation room.
  • A single LT3000 can provide control for up to four rooms.
  • Open Period: A touch panel set up as the central host that can monitor and forcibly turn the lights on or off.
  • Restricted Period: The user borrows a card key from the admin office, enters the room and inserts the card into the card reader before being allowed to use the lights.

(B) Switch Control

Central control - preset off

LT3000 solution: Central control with multiple preset off times to turn off lights in case people forget.

During Class: Manual switch on.

After Class: Manual switch off.

Noon or Evening: Central control turns off lights at preset times.

(C) Energy Saving Control

Local switch with sensors

Centralized control with local energy saving: Locally installed LT3384 with the IS48 digital switch and K15 sensor.

Regular Hours (Central authorizes local operation)

  • Person enters, manually presses button to turn the lights on.
  • Person leaves, manually presses button to turn the lights off.
  • Person leaves but forgets to turn off lights, K15 automatically turns the lights off.

Special Situations

  • Central forcibly takes control
  • Local controls are disabled.