VFD Basics and the Tower IQ June 10 th, 2013

The Rundown  Cerus Overview  VFD Basics  VFD Applications and Packages  Cooling Tower IQ  Questions

Corporate Overview Key Management Kent Holce, CEO Founder of Veris Industries & Sentrol Andre Perra, President Former VP of Marketing Schneider-Square D North America Timeline Founded in 2002 Shipping Product in 2003 BAS Product Released in 2005 HVAC Channel Development, up over 30%

Motor Controls Hierarchy Magnetic Starters Full-Voltage, Non-Reversing (FVNR) Starters –100% Full Speed – On/Off –Efficient for Low HP Soft Starters Reduced Voltage Starters –Ramp Up/Down to 100% - Time-based ramping (with limits) Variable Frequency Drives Adjustable Speed/Frequency –User-defined speed settings –Programmable presets for specific operational requirements

HVAC Starter Applications Pump Applications:  Lead/Lag Pumping Systems  Circulating Pumps  CT Spray Pumps Fan Applications:  Supply Fans  Exhaust Fans  Return Fans  Air Handlers  Cooling Tower Fans

Drive Basics Typical Variable Frequency Drive Configuration Variable speed is used to replace inefficient mechanical regulator devices such as valves, dampers, clutches, etc. Variable Speed Variable Frequency (PWM) Sensor Output (CO, Temp, Etc) Appropriate Feedbacks Utility Power Process Reference VFD

Why Use Variable Frequency Drives? –Reduced Energy Consumption –Improved Process Control / Efficiency –Increased Product Quality / Reduced Maintenance –Expanded Automation / Integration –Broader Equipment Flexibility / Versatility –Increased Reliability / Availability –Reduced Energy Consumption –Improved Process Control / Efficiency –Increased Product Quality / Reduced Maintenance –Expanded Automation / Integration –Broader Equipment Flexibility / Versatility –Increased Reliability / Availability

Applications, Fans and Blowers Variable Speed - Power Requirement Large decrease in power requirement for relatively small decrease in flow

VFD Cost Savings VFDEstSavingsCalc.asp Example: - 40 HP VFD 460/3 - Average usage of 3,500 Annual Hours - Average Speed usage of 50 to 60% - High Efficiency Fan - $0.07 ($/kWh) Utility Rate Yeilds: - 43,000 kWH/Year Saved - $3,046 in Annual Savings Drive Cost - $5,000 Utility Rebate - $2,500 Months to Payback – 10 Months!

Variable Frequency Drives

1HP ~ 400HP (VT) P Series  NEMA / UL Type 1  High Performance, Full-Featured Drive  8 Programmable Digital Inputs  4 Programmable Relay Outputs  Analog Inputs: 0-10V, 4-20mA  Analog Output: 0-10V  Fault Output Relay  Sleep Mode  Dual PID Set Points  Multi-motor Control  Standard Modbus Communications  Optional Communication Protocols:  LonWorks  BACnet  Metasys N2  UL, cUL, CE, ISO 9001, ISO Cerus VFD Selection – P Series

Setup, Multi-Motor Control One drive supplies power to multiple motors simultaneously. Drive Sized for Total FLA Each motor needs OL protection All motors will run at the same time and speed MOL1 MOL2MOL3 MOL4 MOL5

Setup, Multi-Motor Control One drive controls up to four auxiliary motors. AUX1 AUX4 AUX3 AUX2 Relay Outputs Aux. motor #1 Aux. motor #2 Aux. motor #3 Aux. motor #4

Separate Harmonics Fundamental vs. Sum of Other Harmonics Total Resulting Harmonics (Red Line) Harmonics Introduced

DC Link Reactors mitigate harmonics but leave the rectifier bridge unprotected Line Reactors mitigate harmonics and provide protection to the rectifier against voltage fluctuations DC Link Reactor vs. Line Reactor

VFD Packaged Options NEMA 12, 3R, 4, and 4X (SS & FG) Multiple VFDs in one enclosure Applications Cooling Tower Control Pump packages Mills Production/manufacturing plants Outdoor mounting Dusty environments Food processing Corrosive environments Enclosed VFDs Hazardous Environments

New Products – Cerus Innovation 1.Fanwall VFD /w Stand Alone (coming) 2.New Soft Start -SAS Version -EMS Version 3.Redundant VFD Panel 4.Energy Management Bypass (EMB) 5.New P-Series Firmware

Cooling Tower Control Panels Panel Packages with Application-based Options: –Integrated Spray Pump Motor Starters –Basin Heater Contactors –Standard Bypass Configuration –Temperature Controller Option –Standalone (PLC Controlled) or Building Automation Controlled

Internal Configuration

The Cerus VFD Advantage 5 Year Standard Warranty – (Industry’s Longest) Drives Done Right –Our application engineers ensure that each drive package will meet the specific application requirements – standard or modified –Cerus makes sure your purchase is protected and does the job the way you intended it to Cerus Bypasses can ship next day up to 40HP, another industry leading service by Cerus

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