Emerson Fisher 4320 Manual de instrucciones descargar pdf (Pagina 42)

Instruction Manual

D103621X012

4320 Position Monitor

April 2014

Switch State / Latching Switch—indicates the position of the monitored equipment (e.g. valve) as a discrete value;

Opened, Closed, Part-Open, Low, Mid, High, or Unknown (displayed for reference).

Opened/High Trip Point and Closed/Low Trip Point—user-defined threshold that determines when the monitored

condition is declared tripped.

Deadband—the amount of return travel inside the threshold that must occur before a tripped state is reset. Valid values

are from 0% to 20%. Default value is 5%.

Edit Parameters—sets the trip points and the deadband for the limit switches under procedural control to prevent

selections that could lead to indeterminate switch states.

D Mapping—allows configuration of the dynamic variable array. Select Set to Defaults to reset to the default values.

Warning Information— If your control system polls devices by using HART Command 3, either 'Dynamic Variables +

Current' must be configured as the content of one of the burst messages, or the Loop Current and the Device Variables

that you have mapped to Dynamic Variables must be included in the data being published. The 'Delayed Response'

mechanism will be used to acquire variables that are not being published, and your host may interpret that as a

communications failure.

D Fault Behavior (On/Off Control)

The device can be configured to enter a Fault State that attempts to drive the pneumatic output to the configured

“fault state”.

Note

When a fault condition is enabled and is active (i.e., in the fault state), the device does not act on the set point from the host. The

device controls the valve using the set point defined during configuration.

All Fault Conditions are disabled by default.

Active Fault Conditions (reference)

Enable Fault Conditions

Select On to enable the follow fault conditions.

D Start Up— initiate the 'Fault State' whenever the device is powered up or reset. This allows forcing output to a

specified state on startup. In Automatic Recovery Mode, this fault state will clear upon receipt of a fresh discrete

set point from the control host.

D Movement Failure— initiate the fault state if the valve has failed to move to the set point in before the Valve

Timeout has expired. (Does not appear in snap-acting mode).

D Temperature Out of Range— initiate the fault state if the temperature is outside of its operating range.

D Sensor Board Failure— initiate the fault state if the device loses communications with the sensor board.

D Low Voltage— initiate the fault state if the supply voltage reaches the critically low level.

D Network Loss— initiate the fault state if disconnected from the network.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 67 68

Sin comentarios

Emerson Fisher 4320 Manual de instrucciones Pagina 42