Emerson Rosemount 8700M - Powering the Transmitter

Quick Start Guide
25
August 2015
Figure 22. Modbus Wiring—Internal Power
6.6 Powering the transmitter
The Rosemount 8732EM transmitter is available in two models. The AC powered
transmitter is designed to be powered by 90–250VAC (50/60Hz). The DC
powered transmitter is designed to be powered by 12–42VDC. Before connecting
power to the Rosemount 8732EM, be sure to have the proper power supply,
conduit, and other accessories. Wire the transmitter according to national, local,
and plant electrical requirements for the supply voltage. See Figure 23 or Figure
24.
Figure 23. DC power Requirements
Peak inrush is 42A at 42VDC supply, lasting approximately 1ms.
Inrush for other supply voltages can be estimated with:
Inrush (Amps) = Supply (Volts) / 1.0
Modbus A/D0
Modbus B/D1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
12 16 20 24 28 32 36 40
Supply Current (DC Amps)
Power Supply (DC Volts)