H3C WX5004 Installation Manual

Also see for WX5004: Configuration guide Getting started guide Installation guide Quick start guide

3-9Make sure that there is at least 1 U (44.45 mm, 1.75 in.) height away from neighbor devices for heatdissipation.Installing the Access Controller on a WorkbenchIn case the standard 19-inch rack is not available, you can install the access controller on a cleanworkbench. When installing the access controller on a workbench,z Make sure that the workbench is flat, sturdy and well earthed.z Keep the environment well ventilated and reserve a clearance of 10 cm (3.9 in.) around the chassisfor heat dissipation.z Place no heavy objects on the access controller.z Keep at least a vertical distance of 1.5 cm (0.59 in.) between access controllers when they areplaced one above the other.Connecting the Ground WireThe correct connection of the protection ground (PGND) wire of the access controller is an essentialsafeguard against lightning strokes and electromagnetic susceptibility (EMS) interference. You mustfirst correctly connect the PGND wire when installing the access controller.The power input end of the access controller is connected with a noise filter, whose central ground isdirectly connected to the chassis, forming the chassis ground (also known as PGND). This chassisground must be securely grounded so that induced and leaked electricity can be safely discharged tothe ground, enhancing the anti-EMS capability of the access controller. Ground the access controller asfollows:When a grounding strip is available1) Remove the grounding terminal screw located at the right back of the chassis, as shown in Figure3-16.2) Fasten the wiring terminal of the yellow-green PGND wire of the access controller to the groundingterminal screw you removed in step 1.3) Put the grounding terminal screw back to the grounding hole on the chassis and fasten it.4) Fasten the other end of the yellow-green PGND wire to the grounding stud for the access controlleron the grounding strip.5) On the grounding strip, use a nut to fasten the grounding stud that is attached with the PGND wire.