Reference Manual
00809-0100-4026, Rev FA
July 2009
4-5
Rosemount 5400 Series
GROUNDING The housing should always be grounded according to 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 are two grounding screw connections
provided. One is inside the Terminal compartment of the housing and the
other is located on one of the cooling fins below the housing. The internal
ground screw is identified by a ground symbol: .
NOTE!
Using the threaded conduit connection for grounding may not be sufficient!
NOTE!
After installation and commissioning, make sure that no ground currents exist
from high ground potential differences in the installation.
CABLE SELECTION Use shielded twisted pair wiring for the Rosemount 5400 Series. The cables
must be suitable for the supply voltage and approved for use in hazardous
areas, where applicable. For instance, in the U.S., explosion-proof conduits
must be used in the vicinity of the vessel. For the ATEX flameproof approval
version of the Rosemount 5400 Series, suitable conduits with sealing device
or flameproof (EEx d) cable glands must be used depending on local
requirements.
Use 18 AWG to 12 AWG wiring to minimize the voltage drop to the transmitter.
HAZARDOUS AREAS When the Rosemount 5400 Series transmitter is installed in a hazardous
area, all national and local regulations and specifications in applicable
certificates must be observed.
EXTERNAL CIRCUIT
BREAKER
For complicance with Low Voltage Directive 73/23/EEG, an external circuit
breaker should be installed.
POWER
REQUIREMENTS
Terminals in the transmitter housing provide connections for signal wiring.
The 5400 transmitter operates with the following power supplies:
Table 4-1. Minimum input
voltage (U
I
) at different currents.
Hazardous
approval
Current
3.75 mA 21.75 mA
Minimum input voltage (U
I
)
Non-Hazardous
Installations and
Intrinsically Safe
Installations
16 Vdc 11 V dc
Explosion-proof /
Flameproof
Installations
20 Vdc 15.5 Vdc
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