Quick Installation Guide
00825-0100-4377, Rev BA
October 2010
3
Rosemount 752
S
TEP
1: W
IRING
C
ONNECTION
Wiring for F
OUNDATION
fieldbus protocol
1. Remove the housing cover on terminal compartment side. Do not remove the cover in
explosive atmospheres when the circuit is live. Signal wiring supplies all power to the
indicator.
2. Connect the power leads to the terminals marked “FIELDBUS WIRING” as shown in
Figure 1. The power terminals are not polarity sensitive.
3. Plug and seal unused conduit connections on the indicator housing to avoid moisture
accumulation in the terminal side. If you do not seal unused connections, mount the
indicator with the electrical housing positioned downward for drainage. Install wiring with
a drip loop. Arrange the drip loop so the bottom is lower than the conduit connections
and the indicator housing.
NOTE
Do not apply high voltage (e.g. ac line voltage) to the indicator terminals. Abnormally high
voltage can damage the unit. (Indicator poser terminals are rated to 32 Vdc.
Figure 1. Fieldbus terminal block
Electrical Considerations
Proper electrical installation is necessary to prevent errors due to improper grounding and
electrical noise. Shielded, twisted pair cable should be used for best results in electrically
noisy environments. Cable Type A is recommended by F
OUNDATION
fieldbus.
Power Supply
The indicator requires between 9 and 32 Vdc (9 and 15 V dc for FISCO) to operate and
provide complete functionality. The dc power supply should provide power with less than 2%
ripple.
Power Conditioner
A fieldbus segment requires a power conditioner to isolate the power supply, filter, and
decouple the segment from other segments attached to the same power supply.
Grounding
Signal wiring of the fieldbus segment can not be grounded. Grounding out one of the signal
wires will shut down the entire fieldbus segment.
Shield Wire Ground
To protect the fieldbus segment from noise, grounding techniques for shield wire usually
require a single grounding point for shield wire to avoid creating a ground loop. The ground
point is typically at the power supply.
See Safety Messages page 2 for complete warning information.
4377_rev BA.fm Page 3 Wednesday, October 13, 2010 2:38 PM
