11
P-300SA1
Fault detection circuit – Loop short-circuited or frequency higher than 120 kHz
• FAULT LED (red LED): 6 flashes, 3-sec. pause, 6 flashes, 3-sec. pause…this sequence
continues until the loop is fixed and the device is then reset.
• BUZZER: 6 beeps, 3-sec. pause, 6 beeps, 3-sec. pause…this sequence is repeated 5
times.
REMEDY: if the loop has not short-circuited, decrease the loop’s frequency by reducing the
number of turns of wire in the loop.
Detection loop operating
• The STATUS LED (green), FAULT LED (red) and BUZZER will flash/beep (count) between
2 and 11 times to indicate the sensing loop’s operating frequency.
1 flash/beep (count) = 10 kHz.
Example: 3 flashes/beeps x 10 kHz = sensing loop frequency is 30 – 40 kHz.
LED AND BUZZER WARNINGS AFTER SWITCH-ON OR RESET
Status LED
Flashing at regular intervals
No vehicle (metal object) detected
Steadily lit
Vehicle (metal object) detected
Fault LED
3 flashes at 3-sec. intervals
The loop is open. Fix it and reset.
6 flashes at 3-sec. intervals
The loop has short-circuited. Fix it and reset.
BUZZER
Sounds for the full duration
of detection
The buzzer will sound like this for the first 10 detections.
Sounds when nothing
is detected
Wires leaking to ground in the detection loop or on the pow
-
er supply terminals. Fix them and reset.
GB
