XLP-8 - Troubleshooting Guide

No Power LED

Possible Causes

• No power
• Bad power supply
• Incorrect wiring
• Insufficient supply voltage
• Failed detector

Troubleshooting

• Verify the power with a voltameter.

  Confirm wiring is correct.

  Measure input voltage:

  • 8>40VDC
  • 8>28VAC

Final Action

• Try another power source withing operational voltage if available.
• If proper voltage is present and LED remains off, replace the detector.

Power LED Flashes Slowly (2Hz)

Indicates supply voltage is below minimum operating voltage (8V)

Possible Causes

• No power
• Bad power supply
• Incorrect wiring
• Insufficient supply voltage
• Failed detector

Troubleshooting

• Move DIP switch 4. If it continues flashing nonstop, this confirms the problem is power-related.

  Confirm wiring is correct.

  Measure input voltage:

  • 8-40VDC
  • 8-28VAC

Final Action

• Try another power source withing operational voltage if available.
• If voltage is correct and LED continues flashing, replace the detector.

Power LED Flashes Once, Every 2 seconds

This indicates an open loop.

Possible Causes

• Open loop
• High loop resistance
• Excessive loop inductance

Troubleshooting

• Confirm a loop is connected to the correct terminals.

  Disconnect loop and measure resistance:

  • Normal: ≤ 1.5 Ω

  • Fault: > 5 Ω

    Measure loop inductance:

  • Must be 20- 1500 µH

    If no meters available:

  • Swap loop with a known‑good detector.

Final Action

• If fault follows loop → Repair or replace loop
• If fault stays with detector → Replace detector

Power LED Flashes Twice, Every 2 seconds

This indicates a shorted loop.

Possible Causes

• Shorted loop
• Low loop resistance
• Insufficient inductance

Troubleshooting

• Verify loop wiring to correct terminals.

  Disconnect loop:

  • LED should slow to 1 Hz

  • If not → detector faulty

    Measure loop resistance:

  • Normal: 0.5–1.5 Ω

  • Fault: < 0.2 Ω

    Measure inductance:

  • Must be > 20 µH
• Swap loop with known‑good detector if meters unavailable.

Final Action

• If fault follows loop → Repair or replaces loop
• If fault stays with detector → Replace detector

Power LED Stays On

The detector is in the diagnostic mode (sensitivity 0) and there is no remembered fault.

Power LED Flashes Irregular Times

Possible Causes

• Electrical interference
• Moving metallic objects near loop
• Bad loop

Troubleshooting

Loop Integrity

• Perform megger test:
  • Disconnect loop
  • Measure loop‑to‑ground resistance
  • ≥ 100 MΩ = good
  • < 50 MΩ = failed insulation

Electrical Interference

• Adjust loop frequency to avoid cross‑talk.
• Power down suspected interference sources.
• Increase lead‑in wire twisting if needed.

Environmental Causes

• Gates or arms too close to loop (keep ≥ 4 ft).
• Reduce sensitivity one level if needed.
• Secure nearby metal objects (e.g., manhole covers).

Final Action

• Call tech support
• Replace loop

Detect LED Intermittently ON/ Stay ON With No Vehicle Present

Possible Causes

• Loop insulation failure
• Electrical interference
• Moving metallic objects near loop

Troubleshooting

Loop Integrity

• Perform megger test:
  • Disconnect loop
  • Measure loop‑to‑ground resistance
  • ≥ 100 MΩ = good
  • < 50 MΩ = failed insulation

Electrical Interference

• Adjust loop frequency to avoid cross‑talk.
• Power down suspected interference sources.
• Increase lead‑in wire twisting if needed.

Environmental Causes

• Gates or arms too close to loop (keep ≥ 4 ft).
• Reduce sensitivity one level if needed.
• Secure nearby metal objects (e.g., manhole covers).

Final Action

• Call tech support
• Replace loop

Detect LED Will Not Turn ON With Vehicle Present

Possible Causes

• Failed Detect LED
• Sensitivity too low
• Loop or detector fault

Troubleshooting

• Perform lamp test:
  • Toggle DIP switch 2

  • Both LEDs should cycle ON/OFF

    Adjust sensitivity:

  • Typical setting: 5
  • Increase incrementally if needed
• Swap loops with known‑good detector if available.

Final Action

• LED fails lamp test → Replace detector
• Fault follows loop → Replace loop
• Fault remains with detector→ Replace detector
• Call tech support