Emerson Rosemount 752 FOUNDATION, Справочное руководство

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4
Reference Manual
00809-0100-4377, Rev CA
Configuration
January 2018
Configuration
2.3 Operation and Maintenance of the Rosemount 752
2.3.1 Set switches
Security (write protect)
Changes can be prevented to the indicator configuration data with the write protection Plantweb
housing switches. Security is controlled by the security (write protect) switch/jumper located on the
interface assembly or terminal block. Position the switch/jumper in the “ON” position to prevent
accidental or deliberate change of configuration data.
If the indicator write protection switch/jumper is in the “ON” position, the indicator will not accept any
“writes” to its memory. Configuration changes cannot take place when the indicator security is on.
To reposition the switches/jumpers, follow the procedure described below. (Simulate = Fieldbus
protocol)
1. Set the loop to manual and remove power.
2. Remove the electronics compartment cover, opposite the field terminal side on the PlantWeb
housing. Do not remove the indicator covers in explosive atmospheres when the circuit is live.
3. Slide the security and simulate switches into the preferred position by using a small screwdriver.
Re-install the indicator cover. Indicator covers must be fully engaged to meet explosion-proof
requirements.
Figure 2-1. Plantweb Housing Switches
A. Security
B. Alarm/simulate
2.3.2 Connect wiring and power up
Wiring for 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 2-2 . 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.
A
B
See “Safety messages” on page 3 for complete warning