Outdoor Equipment for Level Crossing Protection
Level Crossing Barrier PPB-660A
The PPB-660A electrically driven level crossing barrier is designed to provide additional safety at road–rail intersections at the same level.
The DM100 barrier control unit monitors system operation and the operational status of the PPB-660A barrier.
In the event of bar arm breakage, both light and acoustic warning signals are automatically activated.
Level Crossing Barrier PPB-660A
The PPB-660A electrically driven level crossing barrier is designed to provide additional safety at road–rail intersections at the same level.
The DM100 barrier control unit monitors system operation and the operational status of the PPB-660A barrier.
In the event of bar arm breakage, both light and acoustic warning signals are automatically activated.
10 kHz Track Circuit
The 10 kHz circuit belongs to the group of audio-frequency track circuits and is used for monitoring short sections at level crossings (train presence detection in the crossing zone, approximately 15 m).
Unlike conventional track circuits, it does not require insulated sections or additional associated equipment.
Operating Principle
The transmitter emits a current with a frequency of 10 kHz, which propagates through the rails and is received on the receiving side.
- When no train is present – voltage (≈10 VDC) activates the DrL relay
- When a train occupies the crossing zone – the wheelsets short-circuit the rails, causing a voltage drop and the DrL relay deactivates
This ensures reliable detection of crossing occupancy and prevents unwanted system activation or deactivation.
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Main Characteristics
- Input power supply: 18 VDC
- Regulated voltage: 12 VDC
- Output voltage: 15 VDC
- Voltage at DrL relay: 5 V or 10 V
- Operating frequency: 10 kHz ± 1%
The system is supplied integrated into a rail head assembly and is installed in the same manner.
Connection is performed using a signal cable (4 conductors Ø0.9 mm are sufficient).
