Setting-Up Advice; Mains Power; Voltage Setting; Mounting The Tdcontroller In A Rack (Grounding, Shielding & Safety Issues) - Nexo NX242 Manuel D'utilisation

8
PAGE

Setting-Up Advice

Mains Power

WARNING ! THIS APPLIANCE MUST BE EARTHED.
The green and yellow wire of the mains cord must always be connected to an installation safety earth or
ground. The earth is essential for personal safety as well as the correct installation of the system, and is
internally connected to all exposed metal surfaces. Any rack framework into which this unit may be
mounted is assumed to be connected to the same grounding circuit. (see also p.8)
NEXO TDcontrollers don't provide a mean to switch off the unit from the front panel. As they are intended
to be rack mounted the back panel is not accessible during use. Therefore it is left to the user to provide a
disconnection mean readily operable.

Voltage setting

NEXO TDcontrollers use a switch mode power supply (SMPS). This SMPS accepts universal AC power
input 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 front
panel of the TDcontroller. Any space above or under the TDcontroller shall be obstructed with a blank
panel.
The rack is a free grounding and shielding structure and it provides extra shielding. Therefore, it is
desirable that the screws used to fix the TDcontroller in the frame or rack provide an electrical contact
between the chassis of the TDcontroller and the rack.
The primary reason for grounding is safety. Conformance to the applicable requirements of the
authorities having jurisdiction is, of course, mandatory. However, grounding also has an impact on
electromagnetic compatibility. From the EMC point of view, it is desirable to have a low impedance
ground 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 closed
ground loops as is economically possible.

Fuse

The fuse provided in the unit will not blow during normal operation. If the fuse blows the TDcontroller
has malfunctioned. This fuse must only be changed by NEXO certified service personnel. In any case
do 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 electric
shock, do not perform any servicing other than that contained in the operating instructions unless you are
qualified to do so.
NX242 USER MANUAL LOAD2_22
DATE : 12/3/2004
SETTING-UP ADVICE