DSD Hei Ling Chau automation system upgrade

Hei Ling Chau Oxidation Ditch Plant

Introduction: WYE was responsible for executing a control and communication infrastructure upgrade at two locations: Nei Kwu Correctional Institution Sewage Treatment Plantand Hei Ling Chau Oxidation Ditch Plant.

WYE is capable of upgrading legacy system, providing comprehensive technical support, installation, and custom programming.

The work

• PLC Migration: Upgrading legacy Siemens S7-400 to the S7-1500 platform at both sites.
• 5G Connectivity: Deploying Robustel 5G industrial routers to connect the system controls of both treatment plants to the central SCADA system located at the Siu Ho Wan Sewage Treatment Works.
• Cabinet & Wiring Design: Designing new PLC control cabinets and engineered wiring to support a phased, low-risk transition.
• Phased Testing & Commissioning (T&C):
• Mid-Stage: using signal splitters to run parallel testing on the new hardware without interrupting existing operations.
• Final Stage: Decommissioning the old PLC wiring and executing a smooth cutover to the new 5G-controlled PLC system.

Pic1. Nei Kwu Correctional Institution Sewage Treatment Plant legacy PLC

Pic2. Hei Ling Chau Oxidation Ditch Plant legacy PLC