tau 300SA1 Notice D'installation page 11

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
Flashing at regular intervals
Steadily lit
3 flashes at 3-sec. intervals
6 flashes at 3-sec. intervals
Sounds for the full duration
of detection
Sounds when nothing
is detected
Status LED
No vehicle (metal object) detected
Vehicle (metal object) detected
Fault LED
The loop is open. Fix it and reset.
The loop has short-circuited. Fix it and reset.
BUZZER
The buzzer will sound like this for the first 10 detections.
Wires leaking to ground in the detection loop or on the pow-
er supply terminals. Fix them and reset.
P-300SA1
GB
11