Stultz Electric Motor & Controls, Portland Maine


New England’s Leading Custom Manufacturer of VFD Control Panels 
for the Water and Waste Water Industry


  • U.L. panel shop for multiple units and modifications such as bypass

  • Large supply of new, used, and loaner drives as well as repair parts

  • 24 hour emergency service

  • System warranty above and beyond factory warranties

  • In-shop repairs and testing with motor loads

  • Power factor and harmonic studies

  • CAD services

  • UL 508 Listed Panels

  • Application assistance

  • Flowmeter calibration, MDEP recognized


  • Start-up services

  • Contract services

  • VFD repairs

  • VFD, PLC, and Control Programming

  • Predictive maintenance services

  • Field service technicians

  • Energy/Power Quality Assistance

  • UL 698A Listed hazardous panels

  • Phase conversion (single to three phase)

  • Efficiency Maine Qualified Partner

Control Panels & VFDs

New England Water & Wastewater News  Past Jobs   Benefits of VFDs Options Available for Drives

More on VFDs

VFD Repairs  Sales 

 Control Panels & Variable Frequency Drives

Stultz Electric Motor and Controls located in Portland, Maine has been building control panels for the water and wastewater markets in New England for over 30 years. We design and build UL listed custom control panels to our customers’ specifications.

We also provide application assistance for drives and motors. We provide start up and training services on all of our products as well as field service and warranty repairs from our Portland facility.

Stultz Electric has worked with over fifty different water districts in the state of Maine from York to Presque Isle as well as numerous towns and cities in New Hampshire, Vermont and Massachusetts.

We are the primary supplier of drives for the Portland Water District which includes Portland and ten surrounding towns. The Portland Water District supplies 25 million gallons of fresh water to 190,000 people every day. Their five waste water treatment plants average well over 20 million gallons a day and peak at over 80 million gallons daily.

Stultz Electric has been working closely with the Portland Water District for many years in all of their facilities to ensure that their customers are never without fresh water and waste water service.

As Seen In New England Water & Wastewater News 

Rob Weymouth of the Kennebunk Water District … had been struggling for years with his West Kennebunk Street duplex booster pump station.  The pressure variations were too extreme.  The pressure dropped too low during peak demand times and rose too high during low water usage hours.  Furthermore, Rob was also having maintenance problems with valve seats and seals.

   Rob decided to install a Toshiba Variable Frequency Drive and use the drive’s built in PID circuitry to control the speed of the 7.5 HP pump and regulate the pressure in this manner.  Rob purchased a Toshiba “G3” VFD from Stultz Electric...Rob noticed that not only was the pressure constant but his electric bill for the station had drastically declined.

     With his old valve system...this station pumped 1,939,000 gallons of water and used 5,260 Kilowatt hours of electricity….with the Toshiba VFD installed, this station used only 1622 Kilowatt hours of electricity.  Rob projects that the Toshiba VFD will easily pay for itself with the energy savings alone in less than 2 years (not to mention reduced maintenance costs) and will continue to save his ratepayers money for many years to come.


Some of the Ways Stultz’ Experience Can Help:

Ogunquit Waste Water

The town of Ogunquit had a 40 HP “S Series” Toshiba drive 30 feet below grade at Moody Beach down below a parking lot. A telephone pole on the side of the parking lot was struck by lightning.  The pole itself was in splinters all over the parking lot when our service technicians arrived. The pump station below the parking lot was completely charred inside.  We installed a spare circuit board on the drive on the spot. The drive and pump station was immediately back up and running.

Paris Utilities

Earlier this Summer, our service technician received a call from Paris Utilities (operating waste water for the town of Paris, Maine) at 11:00 PM on a Saturday night. Their entire pump station was down.  Our service tech arrived before midnight. He spent two hours swapping out parts and got the station back up and running. The following Tuesday, he had the permanent replacement drives installed and operating.

No one in the town of Paris ever noticed there was an outage.

Hampton Beach

Most drives are set up with three leads going in and three leads going out. At Hampton Beach an electrician doing an install on a 10HP drive for the pump station reversed the incoming and outgoing leads.  When the drive was energized, the entire system blew. When we inspected the unit, the only damage to the drive was a fuse that blew.

We replaced the fuse and the drive worked fine from that point on.

Scarborough Waste Water

The town of Scarborough, Maine has a pumping station that has to handle a two mile, 12” diameter straight run that climbs 113 vertical feet. The station was having a lot of problems with their check valves slamming shut due to the head pressure. The force of the head pressure was causing mechanical breakdowns. Finally, one day the piping broke loose and flooded the station with waste water.

Stultz Electric installed variable frequency drives on each pump motor which slowly opened and slowly closed the valves. The station has encountered no problems since.

Brown Street Pump Station

The Brown Street Pump Station in Westbrook, Maine had a brand new motor and drive installed. Stultz Electric supplied the drive. The GFI’s on the drive kept tripping shutting off the pump station.  Stultz could find nothing wrong with the drive. Finally, we took out the motor and completely disassembled it. There was a stray wire in the windings that caused an intermittent short to ground.

Although all normal tests of the motor showed no problem, the drive was so sensitive that it picked up the ground fault condition and tripped off the GFI.

Westbrook Waste Water

Westbrook, Maine has a large clarifier unit that had a lot of problems. The arm would occasionally get stuck which would then damage the gearbox and/or shaft and/or motor.

Stultz Electric recommended and installed a drive set for torque control. The drive senses any rise in current and immediately shuts down the motor and gear box. It also sets off an alarm to notify station personnel of the problem with the clarifier arm.

Further damage to the gearbox and motor has been completely eliminated saving the station considerable maintenance costs and downtime has been cut to one third the time.


Why Use a Variable Frequency Drive (VFD)

Variable Frequency Drives are used in many different applications to closely control machinery, motors, generators or pumps. Drives can instantly change the torque or speed of motors.

Drives range in size from fractional horsepower (1/4 HP) up to 500 HP off the shelf. All of the top drives on the market today have hundreds (over 900 in some cases) of separate functions built in. VFD’s convert single phase or three phase AC power into DC power and then back into AC power. The output AC power is now infinitely variable.

Drives are not indicated in every situation. In instances where motors or machinery are already running at peak efficiency, drives will add nothing of value. However, in most applications, motors have varying loads or other external forces where drives can drastically improve the performance. They are ideally suited to a fluid pump environment where changes in head pressure is highly variable. This includes almost all water and waste water applications.

There are a number of advantages using drives:

Electrical Control - A drive can change the speed of a motor to maintain a constant torque on a pump. This can result in very high energy saving as well as greatly reduced mechanical stresses. A slow down in speed from 100% to 80% can actually save 50% of the energy costs. Drives can control soft starts and active breaking. PID functions provide process control.

Mechanical Savings - VFD’s can eliminate the need for dampers, throttling valves, pressure tanks and other energy wasting devices. A VFD when properly installed and programmed, will perfectly match the motor to it’s application on a second by second basis.

Single Phase Input -Increasingly, pumping stations are being located where three phase power is not available. VFD’s can take single phase AC power and convert it to three phase AC power. This allows the station to avoid the extra expense of purchasing DC motors with their higher initial cost and higher maintenance costs.

Environment Response - VFD’s can sense changes or problems in the environment. Most pump stations have a generator backup which, when activated, can create surges. VFD’s can instantly respond to change speed or shut down before serious mechanical failures can occur.

Remote Monitoring - VFD’s are frequently used as part of a remote monitoring station to help monitor and regulate unoccupied pumping stations. VFD’s are self protective and self checking to a high degree. Through the use of land lines or telemetry, VFD’s constantly monitor systems performance to help control manpower costs.

Whatever your needs, Stultz Electric technicians are experts at solving wastewater and fresh water problems. We are not only in the business of selling drives. We are in the business of building custom panels (including drives) to solve our customers’ unique needs.

No matter what your pumping station requirements, we at Stultz Electric can help you solve your unique problems. We have the experience and commitment to quality that our customers have come to expect of us for the past quarter of a century.

We stand by our products and customers year after year to provide service all over New England whenever and wherever the need arises. Our customers are never alone. Even in your most remote pumping station, help is just a phone call away.

Some Options Available on Drives

Enclosures: NEMA Type 1, Type 12, or Type 4 may be specified.

Bypass: Allows the motor to be switched from inverter to across the line operation. This utilizes two mechanically interlocked contactors controlled by a front panel mounted inverter/bypass selector switch.

Auto-Bypass: Same as bypass except it automatically transfers the motor to across the line operation.

Local/Remote: Allows for the selection of panel front speed control or remote station speed control. Includes a local/remote selector switch, auto/manual selector switch and terminal connection for remote speed pot and start/stop push buttons.

Isolation Transformers: For added protection of equipment and personnel, electrostatically shielded isolation transformers are available. The transformers are mounted in Type 1 enclosures and are available in most common voltages.

Climate Control: Space heater and air conditioners are used to control the internal environment of the inverter enclosure. Fans and filters can also be supplied for the industrial environments.

Single Phase Input: Units may be set up for single phase input to operate a three phase motor.

Line Reactors: Provide additional line impedance for installations where the incoming power is unstable. Recommended where a drive is powered by a very large supply transformer.

Transducers: Voltage or current devices can be supplied to interface with instrumentation systems. Level, pressure and temperature are common.

Dynamic Braking: For applications requiring fast deceleration, or applications with high inertia load, dynamic breaking resistors may be specified.

Special Meters: A number of meters can be provided for customer use. Optional meters include (digital or analog) frequency, voltmeters, ammeters, watt meters, elapsed time meters and percent load.

Remote Stations: Remote stations can be provided with many different combination of devices. Standard stations contain an analog frequency meter, a speed pot and either a run/stop selector switch or stop/start pushbuttons.

Jogging: Includes a run/jog selector switch. When in the jog position, the start pushbutton is momentary only.

Controllers: A complete line of process control equipment is available to simplify even the most complex operations.

UL: Listing is available for all built up units.

Disconnect Switch: Circuit breaker or main switch may be incorporated in a built-up panel.

Harmonic Filters: May be added to minimize harmonic current distortion that can effect electrical systems.

RFI/EMI Filters: Solve noise problems to and from equipment by reducing radio frequency emissions.

Long Lead Filters: Used where the length of cable between the drive and motor is long resulting in damaging voltages.

Communication: Many digital communication options are available for interfacing with various brand name protocols.





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Stultz Electric Motor & Controls
1 McAlister Farm Road, Portland ME 04103
Ph: 207-699-2501  Fx: 207-699-2508

This site was last updated on November 7, 2013