Rosemount 8712, Справочное руководство

Страница: 19 / 212

Reference Manual
00809-0100-4664, Rev BA
January 2010
2-9
Rosemount 8712
Installation Category
The installation category for the Rosemount 8712 is
(Overvoltage) Category II.
Overcurrent Protection
The Rosemount 8712 Flowmeter Transmitter requires overcurrent protection
of the supply lines. Maximum ratings of overcurrent devices are as follows:
OPTIONS,
CONSIDERATIONS, AND
PROCEDURES
If the application of the 8712 includes the use of options such as multidrop
communications, auxiliary output control, or pulse output, certain
requirements may apply in addition to those previously listed. Be prepared to
meet these requirements before attempting to install and operate the
Rosemount 8712.
Connect Transmitter
Power
To connect power to the transmitter, complete the following steps.
1. Ensure that the power source and connecting cable meet the
requirements outlined on page 2-8.
2. Turn off the power source.
3. Open the power terminal cover.
4. Run the power cable through the conduit to the transmitter.
5. Loosen the terminal guard for terminals L1 and N.
6. Connect the power cable leads as shown in Figure 2-5.
a. Connect AC Neutral or DC- to terminal N.
b. Connect AC Line or DC+ to terminal L1.
c. Connect AC Ground or DC Ground to the ground screw mounted
on the transmitter enclosure.
Figure 2-5. Transmitter Power
Connections
Connect 4–20 mA Loop
External Power Source
The 4–20 mA output loop provides the process variable output from the
transmitter. Its signal may be powered internally or externally. The default
position of the internal/external analog power switch is in the
internal position.
The user-selectable power switch is located on the electronics board.
Power System Fuse Rating Manufacturer
90–250 V AC 2 Amp, Quick Acting Bussman AGCI or Equivalent
12-42 V DC 3 Amp, Quick Acting Bussman AGC3 or Equivalent
Transmitter
Power Cable
AC Neutral or
AC Line or
AC Ground or
DC Ground
Fuse