AC Tech adjustable speed drives, adjustable frequency drives, ASDs, or AFDs

AC Tech adjustable speed drives - provided by Electram Rotary Equipment Ltd, Canadian and USA distributors.

Rated #1 best HVAC drive!

THE MCH SERIES - For HVAC Professionals

Designed for centrifugal loads as found in fan, pump and cooling tower applications. The MCH Series adjustable frequency drive is designed to control these applications by the most energy efficient means: direct motor control.

Whether you specify, install or operate HVAC systems, you can rely on the drive built specifically for HVAC Professionals.

These adjustable speed drives will accept input from single-phase power (with 1.73 derate for motor HP). As example, a 20 HP drive is required to power a 10 HP electric motor when the drive is connected to a single-phase source.

General Specifications

Horsepower: 1 to 250 HP (0.75 to 185kW)
Supply Power:
                     Three Phase: 208, 240, 400, 480 or 590VAC
                     50 or 60 Hz (+10/-15%) or, can operate from                      a single-phase source with (1.73 derate).

Motors: The MCH adjustable speed drives are designed to operate standard polyphase induction motors rated for
                     200, 230, 400, 460 or 575VAC from 0 to                      120Hz.

Enclosure: NEMA 1 is standard for drive & options
                   NEMA 12 available for drive only.

Standard Features

Easy set-up and operation: The MCH adjustable frequency drives offers intuitive operator interface using plain English programming and operational information.
     • 2-line, 32 character backlit display
     • Keypad with H-O-A operation
     • Personal computer interface using
         AC Tech’s free TechLink Software

PID set point control: Let the drive software adjust the motor speed to maintain a preset pressure, flow, temperature or other independent variable.
     • Remote enable/disable
     • Direct or reverse acting
     • Transducer calibration
     • High/Low level alarm

Motor Thermal Overload: The MCH includes UL and cUL approved motor protection device for single motor applications.

MCH Installed Options
Pre-Engineered and factory installed, MCH options are "Contractor Ready" providing the following benefits:

Rugged steel enclosure with hinged cover.

Plenty of knockouts that allow for top or bottom conduit runs.

Generous wire ways.

Oversized terminal strip duplicates all the VFD terminals with plug connections that allow easy removal of the MCH Series without disturbing any field wiring.

Branch Circuit Protection:
Choose either a Circuit Breaker or Disconnect with fusing, both offer door interlocked rotary handle. If branch circuit protection is located elsewhere, door interlocked disconnect switch is available without fusing.

Input Line Reactor:
The most recommended complement to a good adjustable frequency drive installation. The input reactor adds protection for the drive against common electrical noise and line spikes while reducing noise and harmonics back to the supply mains.

Drive Bypass:
Three-contactor drive bypass completely isolates the adjustable speed drive when operating the motor at full speed directly across the line. Contactor logic and controls are operated at 115VAC and include pilot light operators and door mounted controls.

Easy to read, easy to use
Intuitive drive keypad & display

MCH with factory installed options
MCH drive with disconnect, fuses and line reactor

MCH Bypass Configuration
MCH drive with bypass, disconnect, fusing and reactor options