Emerson Process Management 8732 manual Field Wiring, 00809-0100-4663, Rev BA, Characteristic

		Reference Manual
Rosemount 8732		00809-0100-4663, Rev BA
		January 2010
Figure 2-5. AC Transmitter
Power Connections	AC Neutral or DC –	AC Line or DC +
		Transmitter
		Power Cable
		AC or DC
		Ground

Connect FOUNDATION

fieldbus Wiring

Transmitter Communication Input

Power Conditioning

The FOUNDATION fieldbus signal provides the output information from the transmitter.

The FOUNDATION fieldbus communication requires a minimum of

9 V dc and a maximum of 32 V dc at the transmitter communication terminals.

NOTES

•Do not exceed 32 V dc at the transmitter communication terminals.

•Do not apply ac line voltage to the transmitter communication terminals.

Improper supply voltage can damage the transmitter.

Each fieldbus power supply requires a power conditioner to decouple the power supply output from the fieldbus wiring segment.

Field Wiring

Power independent of the coil power supply must be supplied for FOUNDATION fieldbus communications. Use shielded, twisted pair for best results. For new installations or to get maximum performance, twisted pair cable designed especially for fieldbus should be used. Table 2-1details cable characteristics and ideal specifications.

Table 2-1.

Ideal Cable Specifications for Fieldbus Wiring

Characteristic

Impedance

Wire Size

Shield Coverage

Attenuation

Capacitive Unbalance

Ideal Specification

100 Ohms ± 20% at 31.25 kHz

18 AWG (0,8 mm2)

90%

3db/km

2nF/km

See “Safety Messages” on page 2-1 for complete warning information.

2-8