Emerson Series 3000 MVD Manuel D’Utilisation
70
Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Configuring Outputs
8.5
Configuring the frequency output
Table 8-7 lists and defines the parameters that can be set for the frequency output.
Example
Configuration:
•
Flow damping: 1
•
Primary mA output: Mass flow
•
Frequency output: Mass flow
•
Primary milliamp output damping seconds: 2
As a result:
•
A change in mass flow will be reflected in the primary mA output
over a time period that is greater than 3 seconds. The exact time
period is calculated by the Series 3000 device according to internal
algorithms which are not configurable.
over a time period that is greater than 3 seconds. The exact time
period is calculated by the Series 3000 device according to internal
algorithms which are not configurable.
•
The frequency output level changes over a 1-second time period
(the Flow Damping value). It is not affected by the Damping
Seconds parameter.
(the Flow Damping value). It is not affected by the Damping
Seconds parameter.
CAUTION
Using Internal zero or None may hamper identification of fault outputs.
To make sure fault outputs can be identified, select Downscale or Upscale.
Table 8-7
Frequency output variables
Variable
Default
Description
Flow source
Mass flow rate
Specifies the process variable that the frequency output will represent.
Select one of the following:
Select one of the following:
• Frequency input flow rate
• Mass flow rate
• Volume flow rate (liquid)
• Mass flow rate
• Volume flow rate (liquid)
(1)
• Gas standard volume flow rate
• API corr volume flow (available only if petroleum measurement
application is installed)
• Std vol flow (available only if enhanced density application is installed
and configured to indicate standard volume flow)
• Net mass flow (available only if enhanced density application is installed
and configured to indicate net mass flow)
• Net vol flow (available only if enhanced density application is installed
and configured to indicate net volume flow)
The output received at the external device can be totalized or used to
control the process.
control the process.
Scaling method
Frequency = flow
Select Frequency = flow, Pulses/unit, or Units/pulse.
Frequency
(2)
1000.000 Hz
• Enter the value, in Hz, that will represent the value configured for Flow.
To calculate the Frequency value, see Section 8.5.1.
• The frequency output has a range of 0 to 10,000 Hz.
Flow
16666.6699 g/sec
Enter the maximum flow rate that is appropriate to your application. See
Section 8.5.1.
Section 8.5.1.
Pulses/unit
(3)
0.0600
Enter the number of output pulses that will represent one mass or volume
unit.
unit.