Nexo PS8 User Manual

Also see for PS10: User manual User manual Quick start guide

Nexo PS8 User Manual Manual pdf 15 page image

ANALOGUE TDCONTROLLER SETTING-UP ADVICE___________________________________________________________________________________________________PS SERIES MANUAL REV3 10/10/05P.15Analogue TDcontroller Setting-Up AdviceMains PowerWARNING ! THIS APPLIANCE MUST BE EARTHED.The green and yellow wire of the mains cord must always be connected to an installation safety earth orground. The earth is essential for personal safety as well as the correct installation of the system, and isinternally connected to all exposed metal surfaces. Any rack framework into which this unit may bemounted is assumed to be connected to the same grounding circuit. (see also p.15)NEXO TDcontrollers don’t provide a mean to switch off the unit from the front panel. As they are intendedto be rack mounted the back panel is not accessible during use. Therefore it is left to the user to provide adisconnection mean readily operable.Voltage settingNEXO TDcontrollers use a switch mode power supply (SMPS). This SMPS accepts universal AC powerinput voltages in the range 90V to 264V, and requires no manual adjustment for voltages in this range.Mounting the TDcontroller in a rack (Grounding, shielding & safety issues)The TDcontroller is intended for rack mounting. The only accessible part during use shall be the frontpanel of the TDcontroller. Any space above or under the TDcontroller shall be obstructed with a blankpanel.The rack is a free grounding and shielding structure and it provides extra shielding. Therefore, it isdesirable that the screws used to fix the TDcontroller in the frame or rack provide an electrical contactbetween the chassis of the TDcontroller and the rack.The primary reason for grounding is safety. Conformance to the applicable requirements of theauthorities having jurisdiction is, of course, mandatory. However, grounding also has an impact onelectromagnetic compatibility. From the EMC point of view, it is desirable to have a low impedanceground network, as a current flowing in the ground network will then produce low voltage in the network.A low impedance network can be obtained using a multipoint ground scheme, with as many closedground loops as is economically possible.FuseThe fuse provided in the unit will not blow during normal operation. If the fuse blows the TDcontrollerhas malfunctioned. This fuse must only be changed by NEXO certified service personnel. In any casedo not replace the fuse with a non-certified NEXO fuse, as this will invalidate the NEXO warranty.CAUTION!This servicing instruction is for use by qualified service personnel only. To reduce the risk of electricshock, do not perform any servicing other than that contained in the operating instructions unless you arequalified to do so.