HVAC VFD (variable frequency drive)productscan decrease energy consumption by reducing the speed of an electric motor. This is possible because most machines do not require the maximum speed of an electric motor in order to meet its load requirements. Reducing the electric motor speed can also extend the lifetime of an electric motor by decreasing wear and tear on its motor parts.

AC Tech MCH Series is designed for HVAC VFD applications. The MCH Series can be used on integrated air, fluid, transfer systems, factory built penthouses with mechanical/electrical systems; complete heat transfer packages, refrigeration systems, and many other related HVAC VFD applications.The packaged MCH Series mechanical systems concept allows for users to decrease the total cost and meet production demands by regulating pumps, chillers and air handlers.The MCH Series is a good solution to increase performance while decreasing power consumption for HVAC VFD applications.

The MCH has automatic-transfer-to-bypass option and a disconnect option. The automatic-transfer-to-bypass option allows the motor to transfer from drive operation, and continueacross the line in bypass mode. This keeps machinery operating even when there’s an issue with the HVAC VFD.The MCH drive can be configured to attempt several restarts, but if the condition will not clear, the automatic-transfer-to-bypass function will transfer from drive operation toline power, without human intervention. The MCH allows for uninterrupted service under demanding circumstances.

MCH Series HVAC VFD Overview

The MCH Series drives were designed for the HVAC market and the specific requirements of industrial and commercial installations. Precision Electric can provide the stand-alone drive or packaged with an input disconnect, VFD fusing and line reactor or a full 3-contactor bypass configuration that also includes motor fusing, auto/manual bypass and 24VDC power supply.

Benefits of MCH

Automatic Transfer to Bypass Option
Automatic Disconnect Option
Keypad Select for HOA (Hands Off/Auto)
PID Setpoint Control
Variable Torque Drive
NEMA 12 Enclosure Available
RS-485 MODBUS Communication
Proven Performance & Reliability

MCH Seriesfan and pumping features:

  • PID set-point control
  • Variable Torque
  • 1 through 250HP (0.18 185kW)
  • Input voltages of 208V, 240V, 400V, 480V and 600V
  • NEMA Type 1, 12, and 4 Enclosures

To learn more about the AC Tech MCH SeriesHVAC VFD, visit the AC Tech Website. For AC Tech MCH Series VFD repair and replacement quotes, contact Precision Electric.

Eaton VFD System Drives

Eaton VFD System Drives

Eaton VFD system drives can reduce energy consumption from 10 to 50 percent by reducingthe speed of an electric motor to its needed output speed. With reduced energy consumption, utility expenses are reduced and within a few months, the investment of Eaton VFD system drives canpay forthemselves.

Eaton VFD system drives allow for steady speed error, fast torque rise time, high immunity to resonance vibrations and high starting torque and current. Eaton VFD system drives canbe customized to fit multiple motor drive systems and high-speed applications. Eaton drives can be designed specifically for high-performance applications with highprocessing power, and the ability to use information from an encoder or resolver to provide precise motor feedback control. Eaton drives also offer a uniquemicroprocessor to provide high dynamic performance for applications where precise motor handling and reliability are required.

The DG1 general-purpose Eaton VFD system drives are part of the Eaton next-generation PowerXL series. The DG1 general-purpose drive is specifically engineered for todays moredemanding commercial and industrial applications. EatonDG1 drives offer an industry-leading energy efficiency algorithm, high short-circuit current ratingand robust design, safety and reliability. The LCX9000 drive is liquid-cooled to utilize potable water or a water-glycol mixture as a cooling medium. The LCX9000 drive has a compactsize and low heat transfer rates to allow the enclosure size to be greatly reduced, which is especially beneficial in UL Type 4X applications.

The PowerXL of Eaton VFD system drives is the next generation enclosed drive platform that packages Cutler Hammer’s PowerXL DG1 and SVX drive families in a fast and reliable designsolution. The CFX9000 clean power of Eaton drives use tuned passive filters to significantly reduce line harmonics at the drive input terminals. These drives are anexcellent choice for small and midsize applications where harmonics are a concern. The CPX9000 drives are used for water, waste water, HVAC,industrial and process industries where harmonics are present. They offer one of the purest sinusoidal waveforms available.

The SVX9000 of Eaton VFD system drives offer sensorless vector control technology coupled with an adaptive motor model and sophisticated ASIC circuit features. This technologyallows for steady speed error, fast torque rise time, high immunity to resonance vibrations and high starting torque and current. The SVX9000 is suitable for multiple motor drivesystems and high-speed applications.

Obsolete Eaton VFD System Drives

The MVX9000 Micro of Eaton drives are sensorless vector variable frequency drives that are designed to provide adjustable speed control of three-phase motors. EatonSLX9000 are compact, powerful and are based on the more robust SVX9000. The SVX9000 is a newer version of the obsolete SLX9000. It is designed to be the next generation of drives specifically engineered for moderncommercial and light industrial applications.The MVX9000 series of Eaton VFD system drives are obsolete and replaced by Cutler Hammer VFD Eaton M-MAX drives. The M-Max drive is a compact micro drive with a broad power range.The M-Max series features board coating, unique mounting characteristics, simple programming, and 50C Rating to make the M-Max perfectly suited for machinery applications in manyindustries. Typical applications for the M-Max drives include Food and Beverage, HVAC, Packaging, Pumping, Textile, OEM, and more.

The HVX series of Cutler Hammer VFD drives are currently replaced by the Eaton H-MAX drives. The H-MAX series of HVAC VFDsystem drives are designed to the HVAC market for fan, pump, and fluid control applications. The patented energy savings algorithm, high short-circuit current rating and intuitiveuser interface provide customers an energy efficient, safe, and easy to use solution for variable frequency drive needs. The H-MAX drive supports the increasing demand for energysavings in buildings, systems and facilities. Built in capabilities and unique features provide a competitive solution that can add value to any end user.

For more information on Eaton VFD system drives, visit the Eaton Website. For Eaton VFD system drives repair and replacement quotes, Contact Precision Electric.



The ABB VFD ACS550seriescovers a wide range of options. It combines a sophisticated microprocessor with advanced IGBT power switching technology to deliver volts per hertz, close looped flux vector and sensorless vector control of alternating current motors. The ACS550series control panel offers numerous benefits making it the most user-friendly panel out of all variable frequency drives in the industry. The extensive library of pre-programmed application macros maximizes convenience and minimizes start-up time. The ACS550 series can handle the most demanding industrial applications in an efficient, dependable and economic manner.The ABB VFD ACS500 series is mainly used on pump, fan, conveyor, and other related constant torque applications. The ACS550 series is ideal for those situations where there is a need for simple installation, commissioning and where custom or special engineering is not required. Download ABB VFD User Manuals.

ABB VFD ACS550 Packaged Systems

The ACS550-CC is a packaged version of the ACS550 series. Itis a complete drive with bypass package that includes the ACS550 VFD, a bypass function that allows the motor to be run at full voltage (in the event the drive is shut down for service), a main disconnect, branch circuit, short circuit and ground fault protection. Complete ACS550 systems are pre-engineered packaged systems that reduce time, effort and the cost of installation. The ACS550-CC bypass function is configured entirely of standard industrial control components. The ACS550-CC bypass package includes two electrically interlocked contactors, a motor overload relay, a control power transformer with primary and secondary fusing, and a cover mounted drive-off bypass selector switch. The ACS550-CC bypass is accomplished by means of the two contactors. One is the bypass contactor used to connect the motor directly to the power line. The second contactor is the output that disconnects the motor from t he drive output when operating in bypass mode. This prevents the back feeding that would occur if line voltage were applied to the drive output terminals. The ACS550-CC output contactor and the bypass contactor are electrically interlocked to prevent simultaneous operation.

ABB VFD ACS550 Enclosure Options

The ABB VFDACS550 series with bypass package is available in Nema 1 and Nema 12 enclosures through 100 horsepower in power ratings of 208-230 voltage. ABB VFD ACS550 with bypass packages are also available in Nema 1 and Nema 12 through 500 horsepower at 480 voltage and 150 horsepower at 600 voltage. For outdoor applications, Nema 3R enclosures are sheet steel construction with a tough powder coat paint finish for corrosion resistance and include a 100 watt, thermostatically controlled space heater and thermostatic control of the force ventilated cooling system as a standard. Technical documentation for the ABB VFD ACS550series can be downloaded from the ABB Website.

To learn more about the ABB VFD ACS550 series, visit the ABB Website. For ABB VFD ACS550 repair and replacement quotes, contact Precision Electric.