Variable Frequency Drives (VFDs)

AC Inverter Drives

Produced in North America, AC Tech is stocked in Edmonton, Alberta, Canada, and in Massachussetts, USA.

MC Series

Three-Phase input or (Single-Phase Input with de-rate) / Three Phase Output

Constant torque / Constant HP drive

The MC Series drives are built in rugged steel enclosures that hold up to daily life on the factory floor. The easy to read 16 character LCD display above the drive keypad allows for easy and intuitive set up as well as daily operation.


The MC series constant horsepower drive can be set up for simple applications requiring ramped start, ramped stop and speed control to demanding applications that require PID set-point control and many other functions. The MC Series consists of the MC1000 and MC3000 models; most applications will use the MC1000 with a keypad that includes Start, Stop, up, down, forward/reverse, Program/Run, Auto/Manual and Enter buttons.

For non-reversing applications that require independent switching of start and stop from local to remote and speed control from auto to manual, the MC3000 series keypad replaces the forward/reverse button with Local/Remote.

Programmable Features

  • Carrier Freq. 2.5 - 14 kHz
  • Independent Accel and Decel Ramps
  • 120 Hz Maximum Output Freq.
  • (650 Hz available)
  • DC Injection Braking
  • PID Setpoint Control
  • Critical frequency avoidance bands

Speed References

  • Keypad
  • JOG (Fwd or Rev)
  • Floating Point Control (MOP)
  • 0-10 VDC Analog Reference (scalable)
  • 4-20 mA Analog Reference (scalable)
  • Potentiometer
  • 4 Programmable Preset Speeds
  • Modbus RTU Serial Sped Reference

MCH Series - Standard features

Designed specifically for HVAC applications including:

  • Fan & blower applications
  • Centrifugal pumps
  • Cooling towers

MCH Series with option box (Fusible disconnect or Branch breaker, bypass contactor, and Line reactor options)

Line voltage calibration: Automatically optimizes current and voltage protection

Anti-stall frequency fold back: Current limit to 120% for one minute

Motor thermal overload: Inverse

Critical frequency avoidance: Two adjustable ranges. Adjustable bandwidth to 10 Hz

Four preset speeds

Independent Accel and Decel

DC injection braking: Timed or continuous. Adjustable voltage level

Low frequency voltage boost for high starting torque

Adjustable carrier frequency for quiet and efficient motor operation (2.5 to14 kHz)

Easy to read display: 32 character backlit LCD. 2 line display. Intuitive HOA keypad

Hand speed reference select: Keypad, 0-10 VDC,4-20 mA, preset speeds or MOP

Auto speed reference select:0-10 VDC,4-20 mA, preset speeds or MOP

Hand and Auto mode: Enable or disable

Password protection: Enable/disable and setting(0000-9999)

Standards: UL, cUL, CE(LVD)


SMVector Frequency Inverter - NEMA 1 (IP31)

Our most technically advanced inverter drive continues Lenze AC Tech's tradition of innovative compact inverter design. The performance and flexibility make the SMVector an attractive solution for a broad range of AC Motor applications and with several communications protocols available, networking drives and components into a system solution can be done now or in the future.

The SMVector NEMA 1 (IP31) is the most common and cost effective drive enclosure for a wide range of applications including packaging, material handling / conveying, positive displacement pumping, and HVAC systems. The power ranges of the SMVector with NEMA 1 (IP31) include:

The SMVector Series can be used with 3-phase AC induction motors and is available in NEMA 1 (IP31), NEMA 4X (IP65) and NEMA 4X (IP65) with an integral disconnect switch. Filtered input versions of the SMV are available in NEMA 4X (IP65) models for compliance with the CE EMC directive.

Programmable digital and analog I/O allow the drive to be configured for many application specific tasks such as multiple preset speeds, electronic braking and motor jogging to name a few. Like all Lenze - AC Tech sub-micro drives, the SMVector uses EPM memory technology for fast and efficient programming.

Type 4X (IP65) enclosures are available for either indoor use, suitable for most indoor industrial environments; or indoor/outdoor use that offers UV protection and has higher impact strength at low temperatures.