Introduction
The Laxven Speed Recorders are an advanced and reliable solution designed for monitoring and recording critical speed, time, and distance parameters of locomotives. Developed specifically for Indian Railways, these systems ensure precise data collection and post-incident analysis, enhancing both operational safety and performance. Powered by the DC voltage available on Indian Railways’ locomotives, Laxven Speed Recorders are compatible with both DC and AC Electrical Multiple Units. The systems provide real-time monitoring and robust data storage, along with built-in alarms and visual indicators for the driver, ensuring seamless and proactive locomotive operation.
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System Overview & Principle of Operation
Laxven Speed Recorders are designed to provide a reliable and accurate record of speed, time, and distance parameters of a locomotive. These systems are powered by DC voltage (50-140V) available in the locomotive, making them suitable for all Indian Railway DC/AC Electrical Multiple Locomotives.
The system records Speed vs. Distance, Speed vs. Time, and other critical data on a non-volatile memory at two locations, ensuring redundancy for post-incident analysis. It also features a digital display for real-time parameter monitoring and audio-visual alarms for exceeding speed limits or system malfunctions.
Each locomotive has two driver cabs:
- One cab is fitted with a Microcontroller-based Speed Recorder cum Indicator.
- The other cab has a Microcontroller-based Speed Indicator only.
- Communication between both units is established via the RS 485 protocol.
- Both units have an LCD display and an alphanumeric keypad for entering locomotive and driver parameters.
The system utilizes a speed sensor mounted on the axle, along with dynamic braking and coasting data, to compute and store real-time parameters. Warning LEDs and alarms notify the driver of deviations from specified parameters.
Key Models
| Model | Description |
| LAX-312 | Strip chart-based speed recorder. |
| LAX-2000D | Microcontroller-based recorder with 8-hour 1-second interval data storage and 45-day 20-second interval storage. Data is stored in a PCMCIA Card and can be downloaded via RS 232 serial port. |
| LAX-2000D3 | Similar to LAX-2000D but with 12-hour 1-second interval storage and 90-day 20-second interval storage on a Compact Flash Card. |
| LAX-2000D8 | Latest model featuring USB & Pen Drive support. Stores 12-hour 1-second interval data and 120-day 20-second interval data on a Compact Flash Card. |
Application
- Provides speed, time, and distance tracking with real-time warning indications for the driver.
- Facilitates post-incident vehicle trend analysis for investigation.
- Assists in driver performance evaluation for training purposes.
Salient Features
| Feature | Description |
| High Accuracy & Reliability | Microcontroller-based system with minimal maintenance. |
| Fail-Safe Operation | Self-diagnostic and redundant memory storage for reliability. |
| Wide Power Supply Range | Operates from 50V to 140V DC, compatible with all Indian Railway locomotives. |
| Built-in Protections | Switch mode power supply with reverse polarity, over-voltage, over-current, and short circuit protection. EMI/EMC suppression included. |
| Redundant Data Recording | Stores data at two locations using industrial-grade compact flash cards. |
| Long-Term Data Storage | Records 12-hour data at 1-second intervals and 120-day data at 20-second intervals. |
| Automatic Logging | Inputs, outputs, and internal faults recorded with date & time stamps. |
| Auto Redundant Sensors | Speed measurement via dual sensors for reliability. |
| Customizable Parameters | User-configurable settings via keypad. |
| LCD Display & Alerts | 16×2 alphanumeric LCD with backlight control. Warning LEDs and audio alarms notify drivers of deviations. |
| Easy Data Download | Supports USB, Pen Drive, and Compact Flash Card downloads. Data can be analyzed using Windows-based software. |
| Advanced Analysis Software | Provides Speed vs. Distance, Speed vs. Time, and over-speeding analysis. Converts recorded data to Excel format. |
| Engineered for Harsh Conditions | Rugged, polarized MS circular connectors ensure reliability in extreme environments. |
Technical specification
| Parameter | Details |
| Power Supply Voltage | 50V to 140V DC from loco battery (24VDC available on request). |
| Power Consumption | Less than 12 Watts. |
| Speed Accuracy | ±0.8% of full scale. |
| Speed Dial | 0-160 km/h (customizable as per requirement). |
| Odometer | 7-digit with 1 km resolution, accuracy of 0.1%. |
| Speed Measurement | Auto redundant speed sensors. |
| Memory Storage | Industrial-grade Compact Flash Card with dual-location recording. |
| Data Resolution | 1-second interval (last 12 hours), 20-second interval (last 120 days). |
| Display | 2×16-character LCD with backlight control. |
| Data Entry | 16-key alphanumeric keypad. |
| Dial Illumination | Adjustable via keypad (0-100%). |
| Wheel Diameter Adjustment | Configurable via keypad (640mm – 1220mm). |
| Digital Inputs | 2 optically isolated 72V DC inputs (expandable). |
| Digital Outputs | Customizable per requirement. |
| Data Download | USB, Pen Drive, or Compact Flash Card. |
| Operating Temperature | -5°C to +80°C. |
| Weight | Recorder cum Indicator: <3 kg, Indicator Unit: <2.5 kg. |
| Analysis Software | Windows-based, user-friendly analysis tool. |
Laxven Speed Recorders offer precision, reliability, and ease of use, making them an essential component for Indian Railways. With redundant memory storage, real-time alerts, and extensive data logging, they ensure enhanced safety, compliance, and performance monitoring for locomotive operations.
