1

The Data Centers, LLCWolf Technology Center 1 Campus

Redundant IM

Sensor/Control

Element

Redundant GBit Industrial Ethernet

Redundant IM

Sensor/Control

Element

Training Sys

RedundantControllers

Engineering Workstation

Redundant GBbit Ethernet

Redundant Controllers

REDUNDANT

PROFIBUS or

CONTROLNET

REDUNDANT

PROFIBUS or

CONTROLNET

Redundant

HMI

Redundant

Historian

Redundant I/O

Bruce Myatt, PE415– 748- 0515

bruce.myatt@thedatacenters.com

Dual & Redundant Distributed ControlsCCHP, HPC Data Center & Energy Storage

Questions

• Now that we’ve discussed the importance of having a control system, what kinds of control systems are available for HPC environments? And are the trade-offs?

 

• Let’s discuss HPC Program Modes. What loads can be expected for commissioning, normal operation and even Linpack Benchmarking? What is the impact on controls in moving between these modes?

Data Center Control Systems Summary

Direct Digital Control (DDC)

Relatively low level of “critical” reliability

Typical application incommercial and light industrial HVAC and “comfort” applications

Pros

Low costEstablished / Familiar

Cons

Proprietary (protocols, structures are manufacturer-specific), low availability

Programmable Logic Controllers (PLC)

Higher level of “critical” redundancy

Typical application in industrial mfg. applications (Industrial HVAC, Chilled Water Plants, CHP)

ProsModerate cost

Easy configuration, “Open” development

Modular scalability & inter-operability;

Tier II, III and IV availability

ConsRequire skilled operations/maintenance staff

Moderately more expensive

Programmable Logic Controllers (PLC)

Higher level of “critical” redundancy

Typical application in industrial mfg. applications (Industrial HVAC, Chilled Water Plants, CHP)

ProsModerate cost

Easy configuration, “Open” development

Modular scalability & inter-operability;

Tier II, III and IV availability

ConsRequire skilled operations/maintenance staff

Moderately more expensive

Distributed Control Systems (DCS)

Most often used in high availability, high level of “critical” reliability

Typical applications (Power gen plants, highly analog applications, Oil and Gas, Nuclear, Mission Critical Facilities etc)

Pros Highly available (system), reliable and robust – extremely fault tolerant, scalability Tier IV availability

Cons – Require skilled/ knowledgeable maintenance staff, Higher capitalization costs

Distributed Control Systems (DCS)

Most often used in high availability, high level of “critical” reliability

Typical applications (Power gen plants, highly analog applications, Oil and Gas, Nuclear, Mission Critical Facilities etc)

Pros Highly available (system), reliable and robust – extremely fault tolerant, scalability Tier IV availability

Cons – Require skilled/ knowledgeable maintenance staff, Higher capitalization costs

SC’14 Critical Facilities Solutions, Inc.

Open Cell Cooling Towers

Chillers w/Integral Free Cooling HXs

Condenser Water Pumps

Chilled Water Pumps

Racks with Rear Door HX

Isolation Valves between Equipment to Segregate Loop

3-Way Control Valve at Each Rack to provide Individual Rack Temperature Control

Looped Chilled Water Distribution at Roof Level

Cross Tie Branches for Each Row of Racks

14”

*Isolation Valves Will be Installed between Main Equipment on Roof to Segregate Loop

16”

14”

14”

14”

6”

14”

6”

6”

6”

Mechanical Plant Limitations & Performance

Chiller Plant and HVAC ControlsVariable Speed Drive/ Pump and piping sizes