307UM0100_01 May 2016 PD17x User Manual Page 10 of 31
indicating to the user that a fault has occurred. The detector must be power cycled or reset via the pushbutton in order
to clear the historical fault information.
In the event of a vehicle passing over the inductive loop, causing a detect, the Green Channel LED will light up indicating
the presence of a vehicle and remain on for the duration of the detect.
It should be noted, however, that the Channel LED does NOT necessarily represent the output state of the relays. It only
represents the detection of a vehicle over the loop. The relay state could for example be different from the LED state in
the case of a pulse output after its pulse duration or a fault output. The only time the Channel LED will go off, while a
vehicle is still present, is if the channel is in limited presence mode and has expired.
The Red Power LED indicates that the unit is powered and functional. The red LED is also used as a communication
interface with the DU100 and DU700 to obtain diagnostics.
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