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How To Safely Discharge A Capacitor | Galco

An Electrolytic capacitor is a passive electrical component used to filter voltage in electronic devices such as Power Supplies or VFD’s (Variable Frequency Drive) and can hold a charge. Because capacitors can continue to hold their charge even when these devices are powered off, it may be necessary to manually discharge the capacitor before servicing the device. There is a quick, do-it-yourself method that can safely discharge the capacitor, requiring no more than a multimeter, a resistor, and a set of alligator clip test leads. To begin, set up your multimeter for taking a DC volts measurement (black probe in COM port, red probe in VΩ port, standard on most multimeters like the Fluke 87V). You can now test the capacitor to measure its stored voltage. Next, you have to select a resistor. A 1000 ohm, 5 watt resistor will suffice for most small capacitors. For larger capacitors, a higher resistance is needed to prevent damage, like a 5000 ohm at 50watts. More resistance also extends the time needed to fully discharge the capacitor to a safe voltage threshold. Now you can attach the multimeter probes to each lead on opposite ends of the resistor, which will allow you to monitor the voltage drop as the capacitor discharges. Finally, connect the alligator clip test leads to each end of the resistor, and then the free clip on each wire/terminal of the capacitor. The voltage reading on the multimeter should immediately begin to drop. When the voltage reading drops into the “mV” range, (or less than 1 volt) the capacitor is safely discharged. You should also be aware that the large, high voltage electrolytic capacitors tend to recharge themselves a little bit once the discharge resistor is removed. After 15 to 30 minutes it may reach 20 to 40 volts just sitting there. This is why resistors are used in Power Supplies and VFD’s to not only balance voltage but to help bleed it off continuously after the Line Supply power is removed. Shop Now! https://www.galco.com/products/electr... Sign up for Galco’s newsletter that features our newest products, our can't-miss deals, our best videos, and total access to Galco’s electronics expertise: https://www.galco.com/ Connect with us!   / galcoindustrial     / galcoindustrial     / galcoindustrial     / mycompany   Don't forget to like and comment on this video, and subscribe to our channel! Galco is a Factory Authorized Stocking Distributor for Over 200 Brands of Industrial Electrical & Electronic Automation, Controls and Component Products; On-Site and Send-In Repair Services for Industrial Control & Automation Products for Over 2,000 Brands; Engineered Systems Integration, Retrofits & Upgrades for Variable Speed Drives, CNC, PLC Systems, Dynamometers & Test Stand Applications. Visit us online at http://www.galco.com or call us at 800-337-1720. With respect to the usage, installation or assembly of any products described in this video, Galco Industrial Electronics, Inc., a Michigan corporation, encourages you to follow the requirements and/or guidelines of: i) the Occupational Safety and Health Act of 1970, Public Law 91-596, as amended, and all laws, rules and regulations implemented in relation thereto; ii) the National Electric Code®; and iii) NFPA 70E®. Any installation, assembly or work described in this video should be performed by a qualified licensed electrician. GTV, Galco, galco.com, Galco Industrial Electronics, and Galco Industrial Electronics, Inc. are registered and/or pending registered trademarks under the U.S. Patent and Trademark Office, assumed names, registered domain names, and/or trade names of Galco Industrial Electronics, Inc., a Michigan corporation. LEGAL DISCLAIMER: While we have made every attempt to ensure that the information provided is accurate and has been obtained from reliable sources, Galco is not responsible for any errors or omissions, or for the results obtained from the use of this information. All information is provided "as is", with no guarantee of completeness, accuracy, timeliness or of the results obtained from the use of this information, and without warranty of any kind, express or implied, including, but not limited to warranties of performance, merchantability and fitness for a particular purpose. At all times you should defer to the instructions and safety guidelines issued by the manufacturer. In no event will Galco, its agents or employees thereof be liable to you or anyone else for any decision made or action taken in reliance on the information provided to you or for any consequential, special or similar damages, even if advised of the possibility of such damages.