HARDWIRED NETWORK
LIGHTING CONTROL RELAY PANELS

Simple Networks can be established by connecting Relay Scanners from different Panels together with a Multi-Conductor Cable.

Network-Wide Control

The WTP-4408 Time/Photo Controller has 8 outputs that can each be programmed uniquely with the following general features:

For example, consider a school where there is a corridor lighting switch and an exterior lighting switch. Likely, both of these kinds of circuits are controlled by relays located in several panels.

Connecting the panels together with a multi-conductor control cable permits the control of a switch or timer to exist at all of the panels. A 10-conductor cable will provide 8 common channels of control at each panel. This is ample for many applications.

Control Circuit (Class 2) Isolation

Most electrical codes do not permit power supplies of the control circuits to be directly connected to each other in parallel. Usually, they have to be isolated.

To isolate the control circuit in each of the panels from one another, use the relay scanner. The scanner's input circuitry is isolated from its output circuitry. The panel's power supply for the relays is connected to the scanner's output circuitry.

The control circuit that signals the scanner uses a control power that is common to all of the panels and is connected to the scanner's input circuitry. Inside of the scanner, the inputs and outputs are optically isolated.

Product Details, Douglas Hardwired Network: