When I drive away from the SPOC drive, I know it's going to do exactly what we've told it to do. It's not going to let us down."

Mike Riley

Oilfield Electrician

Discover why IronHorse has been successfully used on more rod pumps
than any other variable frequency drive — period.

Learn how IronHorse can benefit your operation. 

With more than 70,000+ units installed, the IronHorse Series Drive has been successfully used on more rod pumps than any other variable frequency drive — period.

IronHorse has proven to maximize rod-pump production, while simultaneously reducing energy costs, downtime, rod separation and workovers.

Maximize production

IronHorse runs the pump at the optimal speed for each well’s inflow rate, which means you can slow your pump automatically at pump off, rather than stopping the motor and shutting down the well.

The majestic rod

Reduce downtime

Decreasing the number of start/stop cycles greatly reduces wear and tear on equipment. That means lower maintenance and replacement costs, AND downtime.

Reduce your costs

IronHorse pays for itself through reduced energy costs. Our customers regularly see energy savings of 10% to 40% over wells without a variable frequency drive; on average, our customers save about 20% on their energy costs.

With near unity power factor, elimination of inrush currents and associated peak demand charges, and a reduction of utility kwh usage, the IronHorse drive payback is quick. Traditional across-the-line starters or Pump Panels will never reduce your operating cost or pay for themselves, but it’s guaranteed with the IronHorse VFD.


Common I/O platform throughout all HP ranges


Transient voltage surge protection and 3% input line reactor


NEMA type 3R outdoor rated enclosures with sun shields, exhaust heat plenum


Integrates with the SPOC and Revelation pump off controllers, as well as 3rd-party pump off controllers


Extreme climate rating from arctic to desert conditions

-40°F to 122°F Standard

Output Frequency Range

0 to 320 Hz Standard


1 Minute (CT/VT)

WiseGuy data capture, trending, time and date stamp, history, USB port for download


Interchangeable and expandable I/O cards


Communications: ModBus RTU, Ethernet and others


Proven, tested products with over 35,000 units


IEEE519 compliant low harmonic options


Input voltage

208V, 230V, 480V +10/-20%

Well Optix SCADA Interface


WiseGuy: The easiest VFD interface available

IronHorse speaks your language. Configuring and operating the IronHorse drive is easy and intuitive. Using oilfield units of measure like “strokes per minute,” as well as standard fault names such as “field kill” or “vibration switch,” we designed the IronHorse specifically around rod pump applications.

Built-in production calculations assist in evaluating wells. The IronHorse is also available in single phase input, eliminating the need for costly, problematic phase converters and the associated over-sizing of components or motors. Additionally, those traditional methods cost you more on your O&M budget dollars due to the high electrical losses that accompany them.

Smart. Intuitive. Easy. That’s what customers say about the WiseGuy VFD interface. If you know industry terminology like “Daily Strokes,” “Run Time History” or “Pump Offs,” then you can operate the WiseGuy. It’s really that easy.

Knowledge is power in the hands of your pumpers and the WiseGuy gives you live trending, history, date & time stamp, KW logging, single touch USB downloads, and much more in the industry’s easiest-to-use, smart and intuitive drive package. Using the WiseGuy, the most recent 30-day production history and up to the last 97 pump off events are graphically viewable and downloadable. WiseGuy is optional on all IronHorse Series Drive packages.

WiseGuy: The easiest VFD interface available


Revelation: the easiest to program, easiest to use pump off control in the industry. Learn More →

Service is always a standard feature on IronHorse

Service is always a standard feature on IronHorse

The oilfield is a difficult, often brutal place. But we understand the pressure to keep your pumps running, no matter the conditions. Our drives are made for extreme conditions—they are engineered and built to run through the heat, the cold, the dust. That said, in the oilfield everything breaks, sooner or later.

If one of our drives goes down, our technical team is available 24/7

Our service team will have you back up and running in hours, not weeks. As one of our customers said, “In the oilfield, there is no tomorrow. Only today.” And that is the belief we live by.

We also have the most comprehensive extended warranty in the entire industry. So you are protected at all times.

Our low-harmonic drives keep you running reliably, efficiently and in compliance

Harmonic drive compliance becomes more critical every day. At SPOC, we focus on a full range of solutions from passive filters to active front-end drive — all to ensure that you continue running reliably, efficiently and in compliance of IEEE519 and EN-6100-3-2.

We manufacture every type of low-harmonics drive, using the latest technology available.  Everything we do is tailored to your needs.

In general, the most comprehensive solution for harmonics is an Active Front End VFD. This technology is electronically based, not magnetically based. It meets the IEEE519 under every scenario and all loading conditions, regardless of voltage imbalance or source impedance. It is so advanced, it can actually correct for low-voltage conditions from marginal systems and correct power factor within the electrical system, saving you money. You can read more about our harmonics solutions here.

Our low-harmonic drives keep you running reliably, efficiently and in compliance

DriveShield Warranty

SPOC offers the most comprehensive warranty in the industry and 24/7 service that will have you back up and running in hours, not weeks.

Low Harmonics

Low Harmonics

SPOC drives keep you running reliably, efficiently and in compliance.

WellOptix Remote SCADA

WellOptix Remote SCADA

Remote monitoring of equipment in the field that gives you actionable production data to enhance your profitability.