Lenze AC Tech EPM – Electronic Programming Module

The EPM contains the drives operational memory. Parameter settings are stored in the EPM and setting changes are made to the “User Settings” in the EPM.

An optional EPM Programmer (model EEPM1RA) is available that allows:

  • An EPM to be copied directly to another EPM
  • An EPM to be copied to the memory of the EPM Programmer
  • Stored files can be modified in the EPM Programmer
  • Stored files can be copied to another EPM

As the EPM Programmer is battery operated, parameter settings can be copied to an EPM and inserted into a drive without power being applied to the drive. This means that the drive will be fully operational with the new settings on the next application of power.

Additionally, when the drives parameter settings are burned into an EPM with the EPM Programmer, the settings are saved in two distinct locations; the “User Settings” and the “OEM Default Settings”. While the user settings can be modified in the drive, the OEM settings cannot. Thus, the drive can be reset not only to the “factory” drive default settings (shown in all Lenze-AC Tech owner’s manuals), but can be set to the Original Machine settings as programmed by the OEM

While the EPM can be removed for copying or to use in another drive, it must be installed for the drive to operate (a missing EPM will trigger an F_F fault)

Additional information and documentation can be found at our website technical library:


SMV Parameter Setup & High Frequency Output

Setting up SMV Drive Parameters

1. Enter the edit parameter mode by:

a. With the drive powered up the display should read Stop.

b. Press the M key once. The drive will flash PASS then display 0000

c. Using the arrow keys change the display to read the default password 0225

d. Press the M key once. You can now use the arrow keys to navigate to the parameter you want to change.

Changing the SMV to high frequency mode above 120hz:

1. Enter the edit parameter mode

2. Navigate to parameter P103 (Maximum Frequency Output)

3. Press the M key once.

4. Use the arrow keys to change the maximum frequency to the desired value. The range of adjustment is 7.5 hz to 500 hz. When changing this parameter to a value higher than 120 hz you must stop first at 120 hz. The drive will flash Hi Fr. Release the button for one second. Press the key again to proceed to the desired value higher than 120 hz.

5. Press the M key once. The maximum frequency is now set to the desired value.


Dynamic Brake Selection for Sub-Micro & SMV Series Drives


Dynamic braking is used when an overhauling load causes regeneration from the motor to occur, especially in situations where the required deceleration time to stop the motor cannot be achieved due to High Voltage nuisance tripping. Most Lenze-AC Tech DB circuits are rated for light-duty use only. The dynamic braking (DB) control circuit is connected to and monitors the fixed DC bus line. When the DC bus reaches 114% of the maximum tolerance, it triggers the chopper circuit in the dynamic brake. The DB circuit will be active whenever the voltage rises on the DC bus. This can occur while the drive is running, while it accelerates or decelerates or even when it is stopped. Using dynamic braking allows a faster deceleration time of a high inertia load. However, fast deceleration of a high inertia load may sometimes cause regeneration and trip the drive into a High Voltage fault. To avoid this, a dynamic brake chopping circuit is switched on when the voltage levels exceed the rated tolerance and brake resistors dissipate the regenerated voltage as excess energy.

Thermal Protection from Overload for the DB Module

Lenze-AC Tech brake modules rated at 0.33 to 10 HP have resistors that are internally mounted. In these modules there is a thermistor that monitors the resistors temperature and can be connected back to the drive to trigger a drive fault.

Using a Lenze-AC Tech DB with Another Manufacturer’s Drive

Applications Support is often asked if the Lenze-AC Tech DB module can be used with a non-Lenze AC Tech drive. This is not possible. The Lenze-AC Tech sub-micro drives have specific inputs that are set to trigger the Lenze-ACTech DB modules. Other VFD manufacturers may encounter problems trying to trigger the DB chopper properly. 1 For the SMVector drives, the dynamic braking module includes a small connector that plugs onto the drive’s DC Bus Board for the B+ and B- connections. A set of mounting instructions is included.

Specifications for these Dynamic Brake Kits and diagrams are available on AC Tech Lenze manual#AN 0039A which can be viewed via PDF at our website at:


AC Tech MCH Series Controls Climate of Oyster Habitat

As a result of over-harvesting, environmental pollution and two new parasites, the famous native Chesapeake Bay oyster population has dramatically decreased. In an attempt to bolster the population, the University of Maryland is conducting a study to assess the effects of introducing the Suminoe oyster, an Asian species that has shown to be resistant to the prevalent parasites.

A University of Maryland 24-month study will examine the Suminoe oysters eating and reefing habits as well as their vulnerability to the known native oyster predators. The tests will be conducted at the Universitys Center for Environmental Science Aquaculture and RestorationEcology Lab. This new facility has the unique advantage of both closed aquatic system as well as a secure, flow-through system plus experimental temperature and carbon dioxide controls for climate change research and a quarantine laboratory for the safe study of non-indigenous species.

Through their mechanical contractor, J.M. Zimmer, Inc., the University of Maryland chose the Lenze – AC Tech MCH variable frequency drive to control their pumps, cooling towers and building HVAC system. The MCH drive features a built-in PID set-point controller functionas well as the automatic 3-contactor drive bypass, which assures full isolation of the VFD electronics and allows the motor to transfer from drive operation and continue running across the line in bypass mode.

The advantage of the MCH 3-contactor bypass in strictly controlled testing laboratories, explains Joe Zimmer Jr. of J.M. Zimmer, is an increase in reliability, making sure we maintain uninterrupted performance of the laboratorys entire HVAC system, so research results are not compromised. Having the power and control wiring easily accessible and ample wiring space, the MCH is considered one of the simplest to install, set up and use of all the HVAC variable frequency drives on the market. A single-point connection makes the MCH drives less error-prone and easy to support.

Process systems often require a system-controlled parameter, such as motor speed, to be able to react to variable situations in order to keep other system attributes constant, such as pressure, flow or temperature. Lenze – AC Tech builds the set pointcontroller function into the MCH drive to compare the set-point value to the actual value and generate a speed command to the drive to correct the variance or error.

MCH Series Benefits

Automatic Transfer to Bypass Option

PID Setpoint Control

Program Controller: Direct or Reverse-Acting

Keypad Option for Local & Remote Operation

Simple to Install

Proven Performance & Reliability

SMVector Pumps Hard-to-Handle Chemicals

Flomotion Systems develops and manufactures unique sealless peristaltic pumps that eliminate loss-of prime failures in chemical feed applications. Typical markets served include water & wastewater treatment, chemical, food & dairy, pharmaceutical, pulp & paper, energy management, power and irrigation.

A long-time user of Lenze – AC Techs MC Series drives; Flomotion has now incorporated the economical, compact and lightweight SMVector drive in the design of their 2001HEC Series pumps.

The Flomotion 2001HEC Series are rugged, reliable and cost effective industrial hose pumps built to succeed in harsh industrial environments. Several features of the SMVector make it a perfect fit for the job, including a removable terminal cover; easy access for control and power wiring and the fact that it can handle a wide range of operating temperatures from -10 to 55C. Last but not least, according to Flomotion, the SMVector offers better protection against electrical shock than any other NEMA 1 controller on the market.

Mounting the SMVector controller directly to the pump allows Flomotion to optimize precious panel space and offer its customers outstanding convenience. The unique EPM or Electronic Programmable Module stores the drives parameter configuration greatly simplifying initial setup.

Centrifugal and pumping applications especially those moving fluids or a mixture of wet and dry ingredients present a challenge because the speed is affected by the load. Fluid moving applications require ‘variable speed’ – a drive and motor that can produce the necessary horsepower to move the load at a constant speed. The motor will draw from the drive the amount.

of current it needs to ‘do the job’. The SMVector drive works well in this type of application because the speed can be controlled tightly in vector mode (more torque/less speed) or loosely in V/Hz mode to determine just the right amount of speed.

SMVector Benefits

Multiple enclosure options available

including washdown

Wide temperature range: -10 to 55C

Removable memory (EPM)

Multiple operational modes

(V/Hz, Enhanced V/Hz, Open Loop Vector)

Lightweight, compact design

Intuitive programming

Multiple communication options


PositionServo Key Ingredient in Successful Recipe for Flat Bread Press Machines

Lawrence Equipment headquartered outside of Los Angeles CA, designs and manufactures state-of-the art flat bread and fried snack equipment used in single small scale and multi-national large scale operations throughout the United States and Europe. The companys tagline The edge on automation summarizes their commitment to advanced technology and superb customer service.

As part of their continuous improvement program, Lawrence Equipment searched for the most efficient automation solution for their Mega Series Press. With a capacity of up to 3,000 dozen, 6 diameter tortillas, chapati, roti or wraps per hour, the Mega Series press is designed for large wholesale and supermarket production. In the demanding and competitive market of foodprocessing equipment, machine yield, quality and uptime are non-negotiable. Customers from across the globe rely on the performance of Lawrence Equipments high-end presses. When designing the Mega Series, the Lawrence engineering team focused on specifying components that provide value, improve ease-of-use and ensure dependability. They especially appreciatedthe PositionServos outstanding programmability and flexibility as well as the expert support provided globally by Lenze – AC Tech.

With the PositionServo, servo-actuated indexing is now a standard feature of the Mega Series press; It accurately arranges the array of dough balls on a Teflon mesh conveyor belt with the exact speed, acceleration and distance so they are fed continuously and evenly into the oven. The servo drive monitors feedback signals from the motor and continually adjusts for deviation from expected behavior. Also, PositionServo drive parameters are stored in the drives EPM (Electronic Programmable Module), allowing Lawrence Equipment engineers to create programs once and then simply copy them in seconds, saving time and avoiding errors. According to Lawrence Equipment, since the inclusion of the PositionServo in the Mega Series Press it hascontributed to a significant increase in throughput. Lawrence Equipment is currently considering incorporating the 940 PositionServo across all its machine platforms.

PositionServo Benefits

Superior Performance

Quick, Intuitive Programming

Removable Memory (EPM)

Seamless Integration Into System

Global Support

Multiple Communication Options

Outstanding Value

Product Availability

Sausage Slicing Application: PositionServo 940 & SMD Series by Lenze-AC Tech Cuts Pricing

Lenze – AC Tech has worked closely with a specialist ultrasonic engineering company to solve the problem of making the perfect sliced sausage quickly and with minimal waste. A traditional cured continental sausage is difficult to cut very finely in an automated process because of the adhesive qualities of the meat, when a slice is made with a normal blade it tends to stick to the blade surface after the cut is complete.

The ultrasonic company, more used to sieving and sorting fine powders than chopping sausages has applied its high frequency vibration technology to ensure the slices drop away from the blade neatly into the correct place each time. The challenge was to integrate this high-end technology into a slicing machine and still meet the low-cost demands of the food processing industry.

The solution was simple, using a 4 amp PositionServo 940 with encoder feedback to control the position of the blade; the knife could be reciprocated in minimal time and with maximum speed and accuracy. Driving through a precise Lenze MCS servo motor and gearbox combination and a cogged belt drive, the thickness of the slices can be controlled along the entire length of the sausage.

The PositionServo is controlled via a Lenze drive PLC unit and an HMI, in this case a 4 Lenze LCD grey scale touchscreen display. By using an smd drive to power the conventional AC motor that actuates the blade, the machine can be operated with domestic 110 240 V supply and still supply a super cost effective combination. Using CANopen to link all the machine control components also allowed minimal wiring to be used and resulted in a highly compact machine that is easy to program and very easy to use.


Integrated servo, inverter, gearbox

and HMI solution

Complete component compatibility

High speed accurate position control

Precise automation within a low budget

CANopen compatibility

Easy to use

PositionServo 941 by Lenze-AC Tech Works Wonders with Wood

KVAL, a highly specialized manufacturer of door cutting machinery was searching for a better servo drive to improve the cost and performance of its milling machines. A local automation distributor introduced them to the Lenze-AC Tech PositionServo. The challenge was to find a cost competitive drive that would fit the existing profile and yet work with legacy servomotors and resolver feedback.

The solution was found in the PositionServo 941 designed specifically for resolver feedback. The PositionServo 941 was fitted directly to an existing machine and tested immediately in torque mode. The drive performed beautifully from the first application of power and led to substantial orders soon after. KVAL is recognized as a leader in the design and manufacturing of precision-engineered door machining and millwork equipment. Increased competitiveness within the millwork industry has forced many smaller companies to become more specialized. As a result, KVAL had to alter the design and configuration of many of its machines, the ease-of-use and programming of the PositionServo 941 meant that it was a simple solution to varying machine requirements.

Compatibility with the existing machine set-up was very important and since Lenze-AC Tech PositionServo products are designed to work effectively with the widest range of motors, feedback and machine control systems, it was no problem to fit in with components from three other manufacturers. Cost is an inevitable pressure for any machine manufacturer and KVAL is no different, the fact that the PositionServo provides solid precision performance, but without a price premium sealed the deal.

PositionServo Benefits:

Works with existing servo motors

Easy programming

Resolver or encoder feedback

Solid technical support

Rugged performance in harsh environments

Tight positioning control with

scalable emulated encoder output

Heat Transfer Boxes & Systems: A Breeze with the AC Tech MCH Series

Epsilon Industries is a supplier of integrated air andfluid side-heat transfer systems including factorybuilt penthouses with mechanical/electrical systems;complete heat transfer packages and refrigerationsystems. One reason for the success of the packagedmechanical systems concept, says Epsilon Sales &Marketing VP, Brad Hughes, is customers realize theycan decrease the total cost and meet their deadlines byutilizing our specialized, highly trained technical staff.To regulate pumps, chillers and air handlers, Epsilonuses MCH Series drives from Lenze AC Tech.

Whatled Hughes to choose the MCH Series? Our choiceof variable frequency drives is a good example of howclosely we look at anything that can be done better.As he explains, These Lenze AC Tech drives offera couple of advantages that make a lot of sense to us,one is the automatic transfer to bypass; the others arethe disconnect option, and the on-site warranty. The automatic-transfer-to-bypass option allows themotor to transfer from drive operation, and continueacross the line in bypass mode.

Say theres an externalcondition that creates a problem with variable frequencydrive operation; like transient voltage harmonics fromthe utility causing the drive to trip off on a fault. The MCHdrive can be configured to attempt several restarts, butif the condition will not clear, the automatic-transfer to-bypass function will transfer from drive operation toline power, without any human intervention.If the drive did not have this capability, an experienced, trained operator would have to be on hand to ascertainthere was a problem, and then he would have tomanually put the drive into bypass mode.

Utilizing theMCH drive is a way for us to make sure we maintain uninterrupted service, no ifs or buts, summarizesHughes. Once again, dependability under demandingcircumstances and assuring their customers that thesystems are going to offer top performance is a crucialaspect of Epsilons market success.Epsilon has found a niche and is taking full advantageof it. Hughes counts on Lenze AC Tech relatingDemystifying drives is the first step towards makingthem an integral part of our clients design. When wedont need an expert to understand them, we can really count on them, and move on.

MCH Series Benefits:

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

Additional I/O Modules Available on SMVector Inverters

Lenze-AC Tech announces the release of Additional I/O Modules for SMVector NEMA 1 and NEMA 4X Inverters.

Available for the NEMA 1 and 4X SMVector models, the Additional I/O Modules are available in two configurations (ESVZAL0, ESVZAL1). The modules supplement the standard I/O functions by providing 1 programmable form C relay output (ESVZAL0) or 1 programmable form C relay output and 2 programmable digital inputs (ESVZAL1).

The I/O module does not add to the overall size of the SMVector inverter as it fits right into the SMVector inverter terminal cover allowing for easy field installation. SMVector inverters that are fitted with an additional I/O module option will no longer have the capability of accommodating an optional communication module. The additional I/O module is great for applications requiring a relay and/or more digital inputs. says Steve Dextraze, Inverter Product Manager at Lenze-AC Tech. The two extra digital inputs are just that supplementary and allow the drive to be configured for several application specific tasks such as multiple preset speeds, electronic braking and motor jogging.

The SMVector inverter drive provides all the features required by demanding applications, including four modes of operation V/Hz, Enhanced V/Hz, Vector Speed, and Torque plus high starting torque, auto-tuning, advanced low-speed control and dynamic speed regulation. The SMVector is designed to be truly a global product, with an input voltage ranging from 120VAC 1-phase to 600 VAC, 3-phase, plus the Electronic Programming Module or EPM, a removable chip that is the drives memory and allows a customer to program multiple drives in just seconds.

Lenze-AC Tech develops, manufactures, markets and supports a complete range of motion control solutions, including servo drives and motors, clutches and brakes, gears and gear motors and variable frequency AC motor drives. Lenze-AC Techs portfolio of AC Drive products extends from some of the worlds smallest sub-micro drives up through large, 500 HP.

Lenze Product of the Year – PositionServo

For three years running, Lenze-AC Tech products have been recognized by Plant Engineering. In 2006, the SMVector Nema1 familyof AC drives and in 2007, the SMVector Nema 4xfamily of AC drives were both chosen by a panel of industry experts as a finalist for the Plant Engineering magazine Product of the Year Award.

In 2009 the PositionServowith MotionView set-up and Configuration tool embedded within the drive (eliminating the need for external software) so impressed the Plant Engineering Magazine’s readers that they voted it the winner in the servo product category.

Criteria for finalists
Product of the Year is a prestigious award bestowed by Plant Engineering magazine. The recipients are manufacturers who have come up with the best ideas to make plant operation better and smarter.

The process
Plant Engineering subscribers who have buy/specify responsibilities are invited to cast an electronic vote to choose the finalists. The votes are then tabulated to pick gold, silver and bronze winners in each category.

Lenze-AC Tech Announces EtherNet/IP for SMVector

Lenze-AC Tech announces the release of EtherNet/IP as an optional communication protocolfor the SMVector Drive. According to Mike Bailey, Product Sales Manager at Lenze-AC Tech, the SMVector AC Drive can seamlessly operate on an EtherNet/IP network with the addition of a simple plug-in communication module. Othernetwork protocolsare also available as option modules including CANopen, DeviceNet, Profibus and Modbus RS-485, states Bailey.

EtherNet/IP is a member of the DeviceNet and ControlNet family of Common Industrial Protocols (CIP) developed byAllen-Bradley(Rockwell Automation ROK). As a member of the CIP family, EtherNet/IP can utilize the same set of pre-defined common objects, thus making communication between devices from different manufacturers much easier.

According to Lenze-AC Tech company officials, Lenze-AC Tech worked together with Allen-Bradley engineers to ensure complete product compatibility. We first added EtherNet/IP to our PositionServo Drive and since then, our customers have been looking for EtherNet/IP for their AC Drive Solutions, says Bailey, and he adds, Allen-Bradley remains the largest implementer of EtherNet/IP, with most applications in the packaging and automotive markets; providing Allen-Bradley compatibility and multiple communication options for all of our products allows our customers to choose the fieldbus that best fits their automation application as well as their physical network. Bailey explains that EtherNet/IP is a popular industrial network solution because it can support a nearly unlimited amount of nodes, can be used on a single point connection for configuration and control and permits devices to send and receive messages simultaneously.