{"id":5538,"date":"2023-03-29T14:09:53","date_gmt":"2023-03-29T06:09:53","guid":{"rendered":"https:\/\/www.ray-tron.com\/?p=5538"},"modified":"2023-07-21T10:12:51","modified_gmt":"2023-07-21T02:12:51","slug":"ele5803","status":"publish","type":"post","link":"https:\/\/www.ray-tron.com\/en\/ele5803\/","title":{"rendered":"How do I connect the shield of a cable to ground potential?"},"content":{"rendered":"

The power stage of all modern motor controllers uses PWM voltage to control the motor power supply. Such PWM power supply signals will cause some EMI radiation and will negatively affect sensitive sensor signals (such as Hall sensors, analog sensors, video signals). Therefore, it is recommended to use shielded motor cables. This recommendation is especially important for 1. long motor cables, 2. motor cables close to sensor cables, and 3. high motor currents.<\/p>\n

The shield of the cable must be connected to earth at least on one side of the cable. If the cable is longer than 1 or 2 meters, it is recommended to connect the shield at both ends of the cable to earth potential.<\/p>\n

Solution:<\/p>\n

The shield of the motor cable can be easily connected to the grounded part of the metal structure (such as the cabinet or the machine) via a so-called grounding clamp. The grounding clamp should be placed close to the controller and the motor. This is the same solution used for the more powerful servo drives and frequency converters, and can also be used for maxon motors and controllers.<\/p>\n

Strip the insulation near the end of the motor cable. (Usually the last 10cm of the cable).<\/p>\n

Install the grounding clamp to the grounded sheet metal of the cabinet or machine, close to the controller and motor.<\/p>\n

Insert the cable shield into the grounding clamp.<\/p>\n

\"\"

Important:<\/p>\n

Make sure the diameter of the ground clamp matches the diameter of the cable and that there is a close and wide contact between the cable shield and the ground clamp.<\/p>\n

Additional notes:<\/p>\n

Grounding wires that may be used to connect different machine structures or ground rods (fixed grounding clamps) have sufficient cable cross-sections. Typically, the minimum cross-section in use is 6mm^2 (copper wire) and the maximum is 25mm^2. Grounding cables with a cross-section of 16mm^2 are fairly common as a standard among machine manufacturers and electrical cabinets.<\/p>\n

The grounding contact will not be obstructed or limited by some anodized coating or paint, for example, if the contact is made by screws, nuts, cable pieces or washers used to contact the metal structure or housing of the motor.<\/p>\n

The main point is that the ground contacts, ground rods, ground wires and cable shields (and any connections between them) need to have lower resistance (i.e. better conductivity) than any other GND contact or wire in the system. Equalization and stray currents always follow the path of least resistance, and these must be the ground wires. Heavy cross-sections and wide ground\/shield contact points ensure that current and potential balance actually passes through the ground rods, metal structures and ground wires. Finally, any contact point should have the same ground potential, which can be achieved by very low wire and connector resistance and minimal voltage drop in the resulting ground path.<\/p>","protected":false},"excerpt":{"rendered":"

The power stage of all modern motor controllers uses a PWM voltage to control the motor power supply. Such a PWM power signal will cause some EMI radiation and can negatively affect sensitive sensor signals (such as Hall sensors, analog sensors, video signals). Therefore, it is recommended to use a shielded motor cable.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[19],"tags":[253,236],"class_list":["post-5538","post","type-post","status-publish","format-standard","hentry","category-blog","tag-blog","tag-pingbixian"],"_links":{"self":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/5538","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/comments?post=5538"}],"version-history":[{"count":0,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/5538\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/media?parent=5538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/categories?post=5538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/tags?post=5538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}