Parking Detectors:
Q: What does "Fail-safe" mean?
A: Fail-safe means that the detector relays are energised in the "un-detect" state, and de-energised in the "detect" state, thus in the event of a power failure, the detector will revert to a "detect" state. Thus a boom in a parking garage will be raised during a power failure.
Q: What does "Fail-secure" mean?
A: Fail-secure means that the detector relays are de-energised in the "un-detect" state, and energised in the "detect" state, thus in the event of a power failure, the detector will revert to an "un-detect" state. Thus a boom in a parking garage will be lowered during a power failure
Q: What does "ASB" mean?
A: ASB stands for "Automatic Sensitivity boost". This means that the "un-detect" sensitivity level will be at the maximum sensitivity setting when ASB is enabled, regardless of the selected sensitivity. This enables high-clearance vehicles to remain detected as they pass over the loop.
Q: What is cross-talk?
A: Cross-talk refers to the interference between detectors that are oscillating at similar frequencies. If the frequency of adjacent loops on different detectors is within 1 kHz of each other, there could be interference, causing false detects to occur. The frequencies need to be separated by changing the frequency settings on the detector.
Q: Why does the detector gives detects with no vehicle present?
A: This could be due to a number of reasons. If there is another detector close by, there could be crosstalk. Crosstalk can be eliminated by changing the frequency settings on one of the detectors. There could also be some external interference such as high voltage lines in the close vicinity, or a motor switching in the vicinity causing spikes on the loop and power lines. Power lines and loop feeders should not be in the same conduit or connection box as high current lines.