60
Reference Manual
00809-0100-4026, Rev HA
Section 4: Electrical Installation
November 2014
Electrical Installation
4.10 HART to Modbus Converter (HMC)
The Rosemount 5400 Series RS-485 with Modbus communication transmitter version operates
using a power supply ranging from 8-30 Vdc (max. rating). See the Rosemount 5300/5400
Series with HART to Modbus Converter Manual Supplement (Document No. 00809-0500-4530)
for details.
Power consumption:
< 0.5 W (with HART address = 1)
< 1.2 W (incl. four HART slaves)
4.10.1 Connecting the transmitter
1. Disconnect/shut off the electrical power to transmitter head and then open the
instrument cover. Do not remove the cover in an explosive atmosphere with a live
circuit.
2. Pull the cable through the cable gland/conduit. For the RS-485 bus, use shielded
twisted pair wiring, preferably with an impedance of 120 : (typically 24 AWG) in order
to comply with the EIA-485 standard and EMC regulations. The maximum cable length
is 4000 ft (1200 m).
3. Make sure that the transmitter housing is grounded, then connect wires according to
Figure 4-15 and Table 4 -2. Connect the lead that originates from the “A” line from the
RS-485 bus to the terminal marked MB, and the lead that originates from the “B” line to
the terminal marked MA.
4. If it is the last transmitter on the bus, connect the 120 : termination resistor.
5. Connect the leads from the positive side of the power supply to the terminal marked
POWER +, and the leads from the negative side of the power supply to the terminal
marked POWER -. The power supply cables must be suitable for the supply voltage and
ambient temperature, and approved for use in hazardous areas, where applicable.
6. Attach and tighten the housing cover. Tighten the cable gland, then plug and seal any
unused terminals, and connect the power supply.
Note
Rosemount 5400 Series transmitters with flameproof/explosion-proof output have a built-in
barrier; no external barrier needed.
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