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Reference Manual
00809-0100-4811, Rev DA
Appendix C: Rosemount 3300 Series with HART
®
to Modbus
®
Converter
January 2015
Rosemount 3300 Series with HART
®
to Modbus
®
Converter
C.5 Electrical installation
Note
For general electrical installation requirements, including grounding requirements, refer to
“Electrical installation” on page 52.
To connect the Rosemount 3300 Series:
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 C-2 and Tab le C- 1. 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
PWR +, and the leads from the negative side of the power supply to the terminal
marked PWR -. 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.
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