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LK 4/8 Contact Closure Switch Programming

It will be necessary to tell the lighting controller what switch type is on each switch channel so that it interprets closure commands properly. There are three basic types of dry contact switches.

·         A MOMENTARY switch (SPDT) typically has a distinct on position and a distinct off position. When moved to the on position, the switch sends a pulsed closure between the on contact and the 24VDC contact of the controller before returning to a “ready” state. When moved to the off position, the switch sends a pulsed closure between the off contact and the 24VDC contact of the controller before returning to the “ready” state.

·         A MAINTAINED switch (SPST) is typically a standard line-voltage wall switch. Motion sensors and contact-closure photosensors may also be maintained switch types. When the switch is turned on, a constant contact is made between the on contact and the 24VDC contact of the controller. When the switch is turned off, the closure is released, which is interpreted as an off command.

·         A TOGGLE switch (SPST momentary) is typically a single push button switch. When the button is pushed and released a pulsed closure is made to the controller switch channel. The first closure is seen as an on command. Each closure that follows will reverse or “toggle” the command.

You can wire up to eight momentary or toggle switches in parallel into one input channel. Maintained switches should not be parallel wired unless they are motion sensors controlling the same area.

LK 4/8 Contact Closure Switch Programming step 1