Emerson 3051S Especificações descarregar pdf (Página 125)

Reference Manual

00809-0100-4801, Rev FA

October 2010

7-21

Rosemount 3051S Series

Overview The transmitter is shipped with Power Advisory off as default and without any

loop characterization performed. Once the transmitter is installed and

powered up, loop characterization must be performed for Power Advisory

diagnostic to function.

When the user initiates a loop characterization, the transmitter will check to

see if the loop has sufficient power for proper operation. Then the transmitter

will drive the analog output to both 4mA and 20mA to establish a baseline and

determine the maximum allowable terminal voltage deviation. Once this is

complete, the user enters a sensitivity threshold called “Terminal Voltage

Deviation Limit” and a check is in place to make sure this threshold value is

valid.

Once the loop has been characterized and Terminal Voltage Deviation Limit is

set, Power Advisory actively monitors the electrical loop for deviations from

the baseline. If the terminal voltage has changed relative to the expected

baseline value, exceeding the configured Terminal Voltage Deviation Limit,

the transmitter can generate an alert or alarm.

NOTE

Power Advisory diagnostic in the Rosemount 3051S HART pressure

transmitter monitors and detects changes in the terminal voltage from

expected values to detect common failures. It is not possible to predict and

detect all types of electrical failures on the 4-20mA output. Therefore,

Rosemount cannot absolutely warrant or guarantee that Power Advisory

Diagnostic will accurately detect failures under all circumstances.

Configuration For inexperienced users, guided setup is recommended. Guided setup walks

the user through settings that configure the Power Advisory diagnostic for

most common usage and applications.

Figure 7-17. Guided Setup

The rest of the configuration section explains the parameters for manual

configuration of Power Advisory diagnostic.

Device Dashboard

Fast Keys

2, 1, 2, 2

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 239 240

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