Nexo PS 8 User Manual

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

Contents

Nexo PS 8 User Manual Manual pdf 47 page image

NEXO A NALOGUE PSTD C ONTROLLERS Page 47/82To avoid electrical shock, do not remove covers.Dangerous voltages exist inside.Refer all servicing to qualified personnel only.WARNING: To reduce the risk of fire or electric shock,do not expose this apparatus to rain or moisture.RISK OF ELECTRIC SHOCKDO NOT OPENCAUTIONThe lightning flash with arrowheadsymbol, within an equilateral triangleis intended to alert the user to thepresence of uninsulated “dangerousvoltage” within the product'senclosure that may be of sufficientmagnitude to constitute a risk ofelectric shock to persons.The exclamation point within anequilateral triangle is intended toalert the user to the presence ofimportant operating andmaintenance (servicing) instructionsin the literature accompanyingthe appliance.WARNING ! THIS APPLIANCE CLASS 1 APPARATUS AND MUST BE EATHED.The green and yellow wire of the mains cord must always be connected to aninstallation safety earth or ground. The earth is essential for personal safety as well asthe correct operation of the system, and is internally connected to all exposed metalsurfaces. Additional recommendation for interconnection to other equipment can befound in the “Analogue TDcontroller Setting-Up Advice” section.8.3 Analogue TDcontroller Setting-Up Advice8.3.1 Mains PowerNEXO TDcontrollers don’t provide a mean to switch off the unit from the front panel. As they areintended to be rack mounted the back panel is not accessible during use. Therefore it is left to the userto provide a disconnection mean readily operable.8.3.2 Voltage settingNEXO TDcontrollers use a switch mode power supply (SMS12). This SMS12 accepts universal ACpower input voltages in the range 90V to 264V, and requires no manual adjustment for voltages in thisrange.8.3.3 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 looS12 as is economically possible.8.3.4 FuseThe fuse provided in the unit will not blow during normal operation. If the fuse blows theTDcontroller has malfunctioned. This fuse must only be changed by NEXO certifiedservice personnel. In any case do not replace the fuse with a non-certified NEXO fuse, asthis will invalidate the NEXO warranty.