Emerson Series 3000 MVD Manuel D’Utilisation
Configuration and Use Manual
69
Configuring Outputs
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Note: Beginning with rev7.0 of the transmitter software, if the LRV and URV are changed from the
defaults, and the milliamp output source is later changed, the LRV and URV will not be reset to their
default values. For example, if mass flow is assigned to the milliamp output, and the LRV and URV
for mass flow are changed, then density is assigned to the milliamp output, and finally mass flow is
reassigned to the milliamp output, the LRV and URV for mass flow are reset to the configured values.
In earlier versions of the transmitter software, the LRV and URV were reset to factory default values.
defaults, and the milliamp output source is later changed, the LRV and URV will not be reset to their
default values. For example, if mass flow is assigned to the milliamp output, and the LRV and URV
for mass flow are changed, then density is assigned to the milliamp output, and finally mass flow is
reassigned to the milliamp output, the LRV and URV for mass flow are reset to the configured values.
In earlier versions of the transmitter software, the LRV and URV were reset to factory default values.
Multiple cutoffs
Cutoffs can be configured for the mA output and also for the mass flow and volume flow process
variables. If mass flow or volume flow has been assigned to an mA output, a non-zero value is
configured for the flow cutoff (see Section 7.3), and the mA output’s Low Flow Cutoff is also
configured, the cutoff occurs at the highest setting, as shown in the following examples.
variables. If mass flow or volume flow has been assigned to an mA output, a non-zero value is
configured for the flow cutoff (see Section 7.3), and the mA output’s Low Flow Cutoff is also
configured, the cutoff occurs at the highest setting, as shown in the following examples.
See Section 7.3 for information on the mass flow, volume flow, and density cutoffs.
Multiple damping parameters
Damping can be configured for the mA output and also for the mass flow, volume flow, density, and
temperature process variables. If damping has been configured for the process variable assigned to an
mA output (see Section 7.3), and a non-zero value is configured for Damping Seconds for the same
mA output, the effect of damping the process variable is calculated first, and the Damping Seconds
calculation is applied to the result of that calculation. See the following example.
temperature process variables. If damping has been configured for the process variable assigned to an
mA output (see Section 7.3), and a non-zero value is configured for Damping Seconds for the same
mA output, the effect of damping the process variable is calculated first, and the Damping Seconds
calculation is applied to the result of that calculation. See the following example.
Example
Configuration:
•
Primary mA output: Mass flow
•
Frequency output: Mass flow
•
AO cutoff for primary mA output: 10 g/sec
•
Mass flow cutoff: 15 g/sec
As a result, if the mass flow rate drops below 15 g/sec, all outputs
representing mass flow will report zero flow.
representing mass flow will report zero flow.
Example
Configuration:
•
Primary mA output: Mass flow
•
Frequency output: Mass flow
•
AO cutoff for primary mA output: 15 g/sec
•
Mass flow cutoff: 10 g/sec
As a result:
•
If the mass flow rate drops below 15 g/sec but not below 10 g/sec:
-
The primary mA output will report zero flow.
-
The frequency output will report nonzero flow.
•
If the mass flow rate drops below 10 g/sec, both outputs will report
zero flow.
zero flow.