6
3.2
Low Level Setpoint and LED Indicator
The bottom trimpo
t labeled “ON” (see Figure 2) sets the Low Level Setpoint which is the level
commonly set for dusk. As the sun sets, the DLC-PDC will switch off both the relay and the lower
LED signifying that the lighting will be switched on. This setup is typical for most applications. Note
that while the daylight is decreasing the High Level LED will switch off, but this will be disregarded by
the controller.
3.3
Relay
A single pole, Form C relay is provided with the DLC-PDC controller. The Common is connected to
Terminal 7, the Normally Open contact is connected to Terminal 6, and the Normally Closed contact
is connected to Terminal 8.
3.4
Relay Status Indicator
The third LED located beneath Terminal 8 (See Figure 2) indicates the status of the DLC-
PDC’s
relay. If the LED is lit, the relay is energized. Since this is a normally closed relay, energizing the
relay will open its contacts. Therefore as described above if the LED is lit the lighting connected to
the DLC-PDC is off in typical dusk to dawn applications and if the LED is off the lighting connected to
the DLC-PDC is on in typical dusk to dawn applications.
3.5
Input Time Delay Switch
The Input Time Delay Switch (see Figure 2) when switched ON (Down Position), enables the time
delay feature. With this feature enabled, a change of state must occur for a minimum of 30 seconds
for the controller to react. This keeps transient lighting events such as lightning flashes or passing car
headlights from switching the controlled lights OFF as well as temporary cloud cover from switching
controlled lights ON.