(Revised 2012-05-01)
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N-TRON SWITCH GROUNDING TECHNIQUES
The grounding philosophy of any control system is an integral part of the design. N-Tron switches are
designed to be grounded, but the user has been given the flexibility to float the switch when required. The
best noise immunity and emissions (i.e. CE) are obtained when the N-Tron switch chassis is connected to
earth ground via a drain wire. Some N-Tron switches have metal din-rail brackets that can ground the
switch if the din-rail is grounded. In some cases, N-Tron switches with metal brackets can be supplied with
optional plastic brackets if isolation is required.
Both V- legs of the power input connector are connected to chassis
internally on the PCB. Connecting a drain wire (shown in green) to
earth ground from one of the V- terminal plugs as shown here will
ground the switch and the chassis. The power leads from the power
source should be limited to 3 meters or less in length.
As an alternate, users can run a drain wire (shown in green) & lug from any
of the Din-Rail screws or empty PEM nuts on the enclosure. When using an
unused PEM nut to connect a ground lug via a machine screw, care should be
taken to limit the penetration of the outer skin by less than 1/4 in. Failure to
do so may cause irreversible damage to the internal components of the switch.
Note: Before applying power to the grounded switch, you must use a volt
meter to verify there is no voltage difference between the power supply’s
negative output terminal and the switch chassis grounding point.
If the use of shielded cables is required, it is generally recommended to only connect the shield at one end to
prevent ground loops and interfere with low level signals (i.e. thermocouples, RTD, etc.). Cat5e cables
manufactured to EIA-568A or 568B specifications are required for use with N-Tron Switches.
In the event all Cat5e patch cable distances are small (i.e. All Ethernet devices are located in the same local
cabinet and/or referenced to the same earth ground), it is permissible to use fully shielded cables terminated
to chassis ground at both ends in systems void of low level analog signals.
Summary of Contents for 709FX Series
Page 1: ...709FX Managed Industrial Ethernet Switch User Manual Installation Guide...
Page 21: ...Revised 2012 05 01 Page 21 of 196 Flow Control NONE...
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Page 39: ...Revised 2012 05 01 Page 39 of 196 Administration SNMP Continued...
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Page 44: ...Revised 2012 05 01 Page 44 of 196 DHCP Server Setup Profiles Continued...
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Page 48: ...Revised 2012 05 01 Page 48 of 196 DHCP Server Setup IP Maps Continued...
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Page 55: ...Revised 2012 05 01 Page 55 of 196 DHCP Relay Local IP Setup Continued...
Page 61: ...Revised 2012 05 01 Page 61 of 196 Ports Configuration Continued...
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Page 98: ...Revised 2012 05 01 Page 98 of 196 The user can specify the manual router ports...
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Page 102: ...Revised 2012 05 01 Page 102 of 196 IGMP RFilter Continued Modifying rfilter port settings...
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