Overview:
Attending a wired MBus site for fault finding a short circuit presents a unique set of challenges and opportunities for effective troubleshooting. Sycous had a client in London that had a site of 243 meters, and with these meters none of them was reading back on the data collection device installed for several days. The issue had been raised initially by the internal Product and Data Support Team at Sycous who spotted the issue at hand when no readings were entering the clients metering and billing platform. On attendance by the Sycous engineer, an error light presented on the data collection equipment represented a short circuit across the hardwired MBus network.
Photo of RED error on Data Collector, suggesting Short Circuit:
What is a Short Circuit?
A short circuit in a hardwired MBus refers to an unintended connection that allows current to flow along an unintended path, bypassing the normal circuit. This can lead to malfunctioning of the MBus system, which is designed for communication between devices in a network. Such a fault can cause devices to fail, result in data loss, or even damage components due to excessive current flow. Identifying and rectifying short circuits is crucial for maintaining the integrity and reliability of the MBus network.
The outcome:
The initial step involved a thorough inspection of the wiring and connections to identify any visible signs of damage or wear in the main level risers on site as well as the main data collection panel. Furthermore, utilizing a multimeter, we conducted continuity tests to pinpoint the location of the short circuit, ensuring that all components were functioning correctly before proceeding with more invasive methods.
After isolating the potential fault areas that Sycous engineers found to be on the 4th floor out of 11, we employed a systematic approach to test each segment of the MBus network across each apartment. This included disconnecting devices one at a time in the local junction box to the riser and to observe changes in the circuit's behavior back on the data collection equipment. By analyzing the data from the metering and billing data logger, we were able to correlate the readings with the physical state of the wiring, which provided valuable insights into the nature of the fault.
Floor plan and diagram of the junction box inside the electrical riser cupboard:
Ultimately, the solution involved replacing a damaged section of the wiring inside one of the apartments on the fourth floor, where it was causing the short circuit. Following the repair, we reconnected the data logger and conducted a series of tests to ensure accurate metering and billing functionality. The successful resolution of the issue not only restored the system's integrity but also enhanced our understanding of MBus technology and fault diagnosis methodologies. Furthermore the red error on the data collection device cleared. These test took majority of a full day across the floors over at the scheme and required two engineers' presence to ensure quick uptime and resolution for the client to raise bills for the residents.