Work Performed
Field challenge
The water treatment plant supplies drinking water and operates in three shifts, requiring prompt response to central-control communication failures, automatic-sequence errors, abnormal alarms and electrical or hardware faults. Disruptive failures cannot always wait for daytime maintenance, so emergency inspection and recovery may also be required at night.
Work / Solution
JUNSEMI performs scheduled inspections and emergency checks following system faults. The work includes modifying SCADA screens and PLC programs, restoring communications, replacing control PCs and backing up operational data. Hardware and electrical failures are diagnosed, and alarm history is used to trace abnormal conditions. New control functions, improvements to existing automatic sequences and upgrades of legacy PLCs are carried out according to the site's operational requirements.
Key functions and engineering
• CIMON SCADA screen inspection and modification
• CIMON PLC and LS Electric XGI/XGR PLC maintenance
• PLC program and automatic-control sequence improvement
• Communication recovery between SCADA, PLCs and field equipment
• Alarm analysis and system-fault diagnosis
• Control-PC replacement and data backup
• Electrical and control-panel hardware troubleshooting
• New control functions and legacy PLC upgrades
• Night-time site response for urgent operational failures
Verified Result
Following inspection, modification and recovery work, normal SCADA screens, PLC sequences, communications, alarms and related equipment operation were verified with the control-room operators. No failure-count or availability improvement is claimed because separate measurement data was not available.