Introduction
The Distributed Power Wireless Control System (DPWCS) is designed for conventional Tap Changer Electric Freight Locomotives and Three Phase AC Electric Freight Locomotives of Indian Railways. It enables seamless wireless communication between the Lead Locomotive (HOT) and Trailing Locomotives (EOT) in a Multiple Unit (MU) setup using RF communication.
System Overview
- The Lead Loco detects traction and braking operations performed by the Loco Pilot and transmits them to all Trail Locos through wireless communication, ensuring synchronized operation.
- Trail Locos send their status data back to the Lead Loco for monitoring.
- 4G GSM module transmits operational data to a web server, enabling remote monitoring via PC/Laptop.
- Internal Flash Memory stores operational data for analysis, incident review, and Loco Pilot performance monitoring.
The Driver Interface Unit (DIU), located in each cab, provides a TFT LCD display, a 22-key keypad, and three pushbuttons for NSN Control, Panto Control, and Emergency functions.
Application
| Locomotive Type | Model(s) |
| Conventional Tap Changer Electric Freight Locomotives | WAG-5, WAG-7 |
| Three Phase Electric Freight Locomotives | WAG-9, WAG-9H, WAG-9HC, WAG-10, WAG-11, WAG-12 |
Salient Features
| Feature | Description |
| Supports 25KV AC Electric Locomotives | Compatible with both Tap Changer and Three Phase locos |
| Multi-Unit (MU) Operation | Enables synchronized control of multiple locomotives via RF communication |
| Neutral Section Negotiation (NSN) | Supports automatic NSN process |
| Accurate GPS Module | Supports GPS, GLONASS, BDS, Galileo, and GAGAN for precise distance calculation |
| Backup Speed Measurement | Utilizes Speed Sensor Unit (SSU) for redundancy |
| RF Wireless Communication | Uses GFSK DSSS Wireless Radio Modem for Lead-Trail communication |
| 4G GSM Module | Enables remote monitoring via web server |
| Flash Memory Storage | Internal storage for fault, event, and long-term data records |
| Driver Interface Unit (DIU) | Equipped with 10.4″ TFT LCD display, keypad, and pushbuttons |
| Data Retrieval & Analysis | USB access and Laxven Analysis Software support |
Technical specification
Wireless Communication (RF Modem)
| Parameter | Specification |
| Frequency Range | 400MHz – 470MHz |
| Data Rate | 19.2kbps (25kHz BW) |
| Harmonic Rejection | > 50dBc |
| Sensitivity | -110dBm for 10⁻³ BER |
| RSSI Dynamic Range | 90dB |
| RF Overload Protection | 10dBm |
| Carrier Power | Selectable: 2W, 5W, 10W |
| Operating Temperature | -10°C to +70°C |
Data Storage & Recording
| Data Type | Storage Capacity |
| Fault Records | 2048 |
| Event Records | 8192 |
| Short-Term Data | Recorded every 1 second (Stores 2 days of data) |
| Long-Term Data | Recorded every 20 seconds (Stores 60 days of data) |
Driver Interface Unit (DIU) – Display
| Parameter | Specification |
| Size | 10.4 inches |
| Resolution | 800 × 600 pixels |
| Colors | 262K |
| Contrast Ratio | 500:1 |
| Brightness | 1200 nits |
| Operating Temperature | -20°C to +70°C |
Electrical & Mechanical Specifications
| Parameter | Specification |
| Power Supply Voltage | 50V – 140V DC from Loco Battery |
| Power Consumption | Less than 12W |
| Vibration & Shock Resistance | IEC 61373 |
| Radio Interference Susceptibility | IEC 60571, IEC 61000 |
| Digital Inputs | 64 (Redundant DIP Card Available) |
| Digital Outputs | 64 (Redundant DOP Card Available) |
| Analog Inputs | 10 (Including 2 Spares) |
| Speed Measurement Accuracy | 0.8% of full scale |
| Recording Management | Cyclic |
| Brightness Control | Through keypad |
| Keypad Keys (Per DIU) | 22 |
| Command Pushbuttons (Per DIU) | 3 |
