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13
Troubleshooting
Q: The detector LED blinks, and it won’t detect
anything.
A:
A blinking LED indicates there is a problem tuning the loop.
An open loop, shorted loop, bad connection to the harness,
loop wires twisted around the entire loop and not just the lead-
in, or not enough turns in the loop are possible causes.
Q: The detector won’t let the door or gate down, it just
reverses and goes back up
A:
The loop has been installed too close to the door. A loop
detector does not know the difference between a vehicle and
a moving metal door or gate. If turning down the sensitivity
does not help, consult the factory or move the loop farther
away from the metal object, at least 4 feet away.
Q: The detector doesn’t detect trucks
A:
The sensitivity is not high enough or the loop is too small to
detect the generally higher metal chassis of a truck. Adjust the
sensitivity or increase the size of the loop so that it can detect
the truck. A loop can typically detect any metal that is less
than 1/2 to 2/3 the distance of the smallest side of the loop.
Q: The detector is erratic
A:
Detectors are generally very stable. If you see erratic be-
havior, check the loop for continuity and leakage to ground.
Check for constant supply voltage. Check to see that the
detector and operator are properly grounded. Check to see
that the wiring harness is securely attached.