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3.2.7 Reset Switch
The detector automatically tunes to the inductive loop connected to it when the power is applied, whether on initial installation or after any break in power supply. Should it be necessary to retune the detector, as may be required after changing any of the switches or after moving the detector from one installation to another, momentary operation of the RESET switch will initiate the automatic tuning cycle.
3.3 Power Fail (Option)
The detector is able to retain the output state for a power failure of not greater than 10 minutes. Thus, when the power is restored, the detector will not re-tune but return to the detect state prior to the power failure. If a vehicle was on the loop during power failure, it will remain detected when power is restored.
3.4 Front Panel Indicator
While the detector is tuning, the ON (Red) LED will glow .The OUTPUT LED (Green) will extinguish when the system is tuned. The green LED will flash at a rate of 1 Hz during tuning. This is used to indicate the frequency of the loop to the user. Every flash of the LED is equivalent to 10 kHz. It will stop when the operating frequency is reached. This operation is also performed whenever the reset button is depressed.
The ON (Red) LED will glow permanently to indicate that the unit is functional. The red LED also serves as an optical interface to the DU100 Diagnostic Unit.
If faults exist with the loop the green LED will come on and flash off at the rate of 2Hz indicating the fault. If the fault is self-healing the detector will continue to operate but the LED will remain on, indicating to the user that a fault has occurred. The LED will go off for a moment during an undetect indicating this, thereafter returning on. This condition can be restored by removing the power or by depressing the reset button.
The green LED will also glow whenever a vehicle is detected passing over the inductive loop.
301UM0030_01 PD130 Enhanced Vehicle Detector User Manual Page: 11 of 29
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