Client Challenge
In 2018, a Data Center’s HVAC system was nearing the end of its lifecycle. The existing Modicon Quantum Hot Standby Control System was installed in 2012 and was responsible for controlling the chilled water systems essential for cooling the center’s servers and storage. The Modicon Quantum PLC needed to be phased out and, the client faced the challenge of upgrading their system to ensure continued operation without compromising the data center’s cooling performance. The HVAC system, which managed the chilled water loop, cooling towers, and air handling units, needed to be replaced with a more reliable and scalable solution. The most critical issue being, that any downtime in the cooling system could cause evere operational disruptions, as servers would begin overheating within 20 minutes without proper cooling.
Additionally, the facility was using an outdated version of the Citect SCADA system, which limited scalability and performance. The client needed a solution that could integrate seamlessly with their existing infrastructure while also preparing for future technological advancements and increasing operational efficiency.
Our Solution
After a complete overhaul of the facility’s HVAC, we decided to make several upgrades to our client’s current HVAC control system:
- PLC Upgrade: The original Modicon Quantum system was replaced with the more advanced Modicon M580 Hot Standby PLC, offering greater scalability, performance, and future-proofing capabilities. The upgrade involved not only replacing the PLC hardware but also migrating the software, ensuring that the control system would remain reliable, easy to manage, and adaptable to future needs.
- SCADA System Upgrade: Alongside the hardware upgrade, we upgraded the Citect SCADA system from version 2 to version 2018, modernizing the user interface and expanding its functionality. This update ensured that the facility could monitor and control HVAC operations with greater precision, reliability, and ease, using multiple client stations throughout the facility.
Operational Efficiency: To optimize HVAC operations, the new system integrated control over Variable Frequency Drives (VFDs) for pumps and fans, ensuring efficient energy use while maintaining the required cooling levels. Additionally, the system included a Winter Mode (Free Cooling) feature that automatically switched to free cooling when outdoor conditions allowed, reducing energy consumption during colder months.
The Results
The successful upgrade provided the client with a highly reliable, scalable HVAC control system that significantly improved the operational efficiency of the data center. With the new Modicon M580 PLC and Citect SCADA system, the data center could now maintain optimal cooling levels with greater precision and fewer risks of system failure.
The integration of free cooling during colder months led to notable energy savings, reducing operating costs. The upgraded system’s improved monitoring and control capabilities also allowed for more proactive maintenance, reducing downtime and ensuring continuous cooling of critical server and storage systems.
Additionally, the transition to the M580 PLC and modern SCADA system prepared the facility’s HVAC operations, enabling easier scalability and smoother integration of additional systems as the data center grew. This comprehensive upgrade ensured that the client can rely on their HVAC system for years to come while maintaining a high level of operational resilience and efficiency.
