Quality Products
Our products are rigorously tested and cleaned, backed by a 2-year DO Supply warranty.
DO Supply is a global automation parts reseller focused on hard-to-find and obsolete industrial automation products. Based out of Raleigh, NC, we service customers worldwide, providing excellent customer and sales support, as well as offering our top-of-the-line warranty on all parts sold.
Our products are rigorously tested and cleaned, backed by a 2-year DO Supply warranty.
We offer various shipping options from UPS, FedEx Priority Overnight, DHL and similar. We also ship internationally via DHL, FedEx, and UPS.
While other automation experts have some expertise, we have nearly half a century, allowing us to help you find the ideal replacement or repair solution.
We are a leading global supplier of industrial automation replacement parts, dedicated to providing expert support, speed, and reliability. We offer a huge inventory of need-it-now surplus PLCs, drives, motors, HMIs, and more. Trusted worldwide, we supply parts from 1981 to today by manufacturers such as Allen Bradley, GE, Eaton Cutler Hammer, Mitsubishi, Johnson Controls, and more. With an extensive inventory of surplus products, we are sure you will find what you are looking for. Our commitment to quality and service is reflected in our A+ Better Business Bureau rating. We guarantee prompt delivery and responsive support, empowering businesses to streamline operations and enhance productivity through reliable automation solutions
We pride ourselves on being your need-it-now destination, specializing in immediate solutions for hard-to-find and obsolete replacements for PLCs, drives, motors, HMIs, and more.
Save money with our repair service backed by a 2-year DO Supply warranty, serviced by US-based technicians.
As industrial automation specialists, we focus on top brands like Allen Bradley, GE, Eaton Cutler Hammer, Mitsubishi, and Johnson Controls, sourcing hard-to-find and discontinued parts. Our dedicated team ensures quality through meticulous testing and repairs. With fast shipping and exceptional customer service, we offer a seamless experience. Plus, our in-house repair technicians provide repair services for most products.
Discover insightful industry knowledge
One of the most important decisions in industrial motor control is choosing the right Variable Frequency Drive (VFD), or AC drive, to match your motor and application requirements. Proper AC drive selection begins with understanding the mechanical load characteristics because the load type determines the current and torque requirements the selected AC drive and connected motor must meet across all operating speeds. An appropriately sized AC drive provides adequate continuous and overload current capability to generate the required motor torque while operating reliably. Selecting an incorrectly configured or improperly sized AC drive often results in insufficient starting or accelerating torque, excessive drive or motor heating, reduced efficiency, nuisance trips, and premature equipment failure. In contrast, an AC drive that is correctly matched to the specified load type helps improve motor performance, operation reliability, energy efficiency, and overall system lifespan. Because of...
When choosing a PLC, the system’s architecture affects all subsequent engineering work, from how control panels are drawn to the cost of maintaining the system over years of service. Most PLCs fall into one of two competing design philosophies: modular architecture, where the I/O, CPU, and power supply are separate elements on a common backplane, or fixed architecture, where all of these are combined in a single housing. Every major PLC vendor offers product lines that follow both designs, and understanding how each platform is laid out helps an engineer pair architecture to application rather than defaulting to whatever solution is already sitting on the shelf. Comparing the five largest control vendors in Europe, North America, and Asia – Rockwell, Siemens, Schneider Electric, Mitsubishi, and Omron – all of which market modular and fixed models side by side – shows which factors vendors weigh when dividing fixed and modular I/O architectures. The real tradeoffs come down not to...
Rockwell Automation’s high-power servo drive platform, the Kinetix 7000, is intended for large-frame motion applications. Commonly paired with MP-Series motors, the drive was available in power ratings from 22 to 149 kW, making it well suited for applications involving high inertia, large mechanical loads, and demanding acceleration and deceleration cycles. One challenge that arises with these applications is managing regenerative energy. When a servo motor decelerates or is driven by its mechanical load, it can operate as a generator and return excess energy back to the drive’s DC bus. However, if that energy has nowhere to go, the rising bus voltage can cause an overvoltage fault. How the Kinetix 7000 handles this energy depends on the system’s power configuration. A drive can operate from its own AC line connection, while systems with greater regenerative demands can incorporate external shunt equipment or a regenerative power supply such as the 8720MC-RPS . Kinetix 7000 drives can...