[Industry 5] Testing cables and wire harnesses in the railroad industry
Concept of Testing & Inspection
Cable & harness testing requirements and features for the railroad industry
1. Overview
Harness cables of railroad vehicles are intricately strung inside the vehicles. Many harnesses are used in the driver's cab, air conditioning, lighting, information display panels, and automatic doors, as well as in the drive units. It is assumed that linear motor cars and driverless trains, which are expected to be introduced in the future, will require even more complex and high-quality cables.
2. About Railway Cables & Wire Harnesses
- ・In the drive systems of rail vehicles, large harnesses with 2,000 to 8,000 points are installed.
- ・These complex harnesses are formed using cable ties and attached to a metal case.
- ・Wiring and resistance testing are conducted as test items.
- ・The harness assembly is tested once in its completed state, and then mounted on a cart or equipment and tested again. This is because the circuit changes when a short bar is attached to the terminal block or connected to the GND or chassis at each stage of the process.
3. Testing of railroad harness cables
- ・Testing points The circuit must be connected without any missing connections, and testing must be performed.
- ・Time of Testing The more points are used, the more important it is to be able to make an accurate judgment in a short time. The standard NMF series lineup allows testing of up to 8192 points in a short time.
- ・Instructions for errors Guidance such as giving instructions with names that are easy for operators to understand or turning on a light attached to the jig is effective for improving efficiency.
- ・Portability of testing equipment In case the cables are inspected after mounting on a trolley, the tester is required to be moved. Then entire testing facility is operated in a wagon rack.
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