Emerson Rosemount 2460, Справочное руководство

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Reference Manual
00809-0100-2460, Rev DE
Installation
October 2018
Installation
3.5 Electrical installation
See Electrical Installation Drawing D7000001-928 for further information.
3.5.1 Cable entries
The Rosemount 2460 housing has nine M20 x 1.5 and two M25 x 1.5 entries. Connections must be made
in accordance with local or plant electrical codes.
Make sure that unused cable entries are properly sealed to prevent moisture or other contamination
from entering the terminal board compartment of the electronics housing.
3.5.2 Power supply
The Rosemount 2460 System Hub accepts supply voltage 100 - 250 Vac (50/60 Hz) and 24 - 48 Vdc.
3.5.3 Cable selection for power supply
Appropriate cross sectional area of wires must be used in order to prevent a high voltage drop to the
connected device. Recommended cable size is 0.75 mm
2
to 2.1 mm
2
(18 AWG to 14 AWG) in order to
minimize the voltage drop.
3.5.4 Grounding
The housing should always be grounded in accordance with national and local electrical codes. Failure to
do so may impair the protection provided by the equipment. The most effective grounding method is
direct connection to earth ground with minimal impedance.
There is a grounding screw on the housing which is identified by ground symbol .
Inside the Rosemount 2460’s terminal compartment there is a ground bar with screw connections
identified by ground symbols
. The ground bar (see Figure 2-5 on page 11 ) shall only be used for
connecting signal related ground wires, e.g. shield ground connections from the field bus harness. The
protective earth ground connection shall be connected to the system hub via the dedicated power
board IEC plug and the external grounding screw on the housing.
Connect shield to ground at one end only, otherwise a ground loop may occur.
NOTICE
It is recommended that a sealant of type PTFE is used to prevent water ingress and to enable future
removal of the plug/gland.
Use the enclosed metal plugs to seal unused cable entries in order to achieve required level of ingress
protection. The plastic plugs mounted at delivery are not sufficient as seal.
NOTICE
Grounding the device via threaded conduit connection may not provide sufficient ground.