The FAAC 2664 DSP-15 is a high-performance vehicle loop detector designed for gating, parking, and access control applications. It works with inductive loops buried in the ground (20-1000 µH) and is engineered to deliver reliable vehicle detection even in noisy electrical environments, changing temperatures, or with long loop leads. Its design supports flexible configuration (fail-safe or fail-secure), multiple relay outputs, and selectable modes for presence, entry/exit pulses, and loop fault detection. Thanks to adjustable sensitivity, delays, and hold-time, the DSP-15 can be fine-tuned to perfectly match the traffic characteristics and safety requirements of each installation.
Use in gate or barrier systems where vehicle detection is needed to automate opening/closing.
Choose Fail-Safe mode when safety is a priority: detector output will be “on” (or active) in case of loop failure or power loss, to ensure gate doesn’t close unexpectedly.
Use Fail-Secure mode where security is more important than free-pass in fault situations.
Set sensitivity relatively high for long loops or loops with large area; reduce sensitivity for small loops or where electrical noise is high.
Use delays/hold-time to avoid false triggers from fast moving vehicles or debris.
Ensure indicators (LEDs) are visible for troubleshooting.
Mounting & positioning
Mount the detector module in a dry, protected location, ideally in the control panel housing.
Ensure good wiring from the ground loop (buried loop) loops properly routed and twisted pair for lead-in if applicable.
Loop Wiring
Install the loop in the ground per standard practice. Connect loop leads to the detector loop input terminals.
Use shielded cable or properly twisted pair to minimize electrical interference.
Power
Supply detector with the correct voltage as specified (as per DSP-15 documentation or FAAC control panel).
Verify power is stable; use suppression or filtering if supply is noisy.
Configure Modes
Set whether you want Fail-Safe or Fail-Secure (jumpers or switches).
Choose relay B’s mode: true presence, entry pulse, exit pulse, or loop fail output.
Set sensitivity via rotary or DIP switches.
Set delay/extension/hold time settings as needed.
Loop Failure Handling
Ensure that loop opening or shorting triggers appropriate behavior (LED indicator, possibly trigger output).
Test for “loop fail” mode: wire failure, disconnection, shorting.
Testing
Walk over loop/test vehicle to confirm detection.
Test entry and exit pulses if configured.
Simulate loop failure to confirm detector responds correctly.
Check that detector doesn’t miss detection during adverse conditions (rain, temperature, etc.).
Maintenance
Periodically check loop continuity, connections, condition of loop lead-in.
Clean any corrosion on connectors.
Check LED indicators for any signs of deterioration or unusual flashing.
Always de-energize power before wiring.
Ensure wiring is protected from moisture and mechanical damage.
If possible, mount detector in enclosure to reduce exposure to dust & water.
Incorrect wiring or configuration (e.g. swapping relay contacts) can lead to unintended behavior (gate opening when it shouldn’t, safety risk).
Be careful with loop placement: avoid interference from nearby metal, power cables, or equipment that can cause false triggers or noise.
Regular inspection ensures loop lead-in is intact; damage or wear can cause failure.
If Fail-Safe mode is used, understand that during power loss or loop failure, detection state may force gate open or safe position depending on system logic; ensure that this behavior is acceptable for your installation.
