Emerson Rosemount 3490 Series, Reference Manual

Page: 120 / 190

Set-up alarms
Diagnostic data for the control unit
Pumped volume totalizing
Menu
SETUP
→
[CONTROLLER]
→
OUTPUT
→
TOTALIZER
This function is for calculating the total throughput in a contents volume application.
The control unit monitors the change in volume when no pumps are running i.e. when any
Assist or Standby mode relay is de-energized. It calculates the rate of change (RoC) of the
control unit PV (D800) every five seconds and then converts it to a rate of change per
minute for displaying as parameter D809.
When a pump is turned on, the control unit assumes that the rate of inflow remains the
same as it was just before starting the pumps. The RoC value (D809) is frozen while the
pumps are on i.e. when any Assist or Standby mode relay is energized.
To totalize pumped volume, the control unit PV (D800) must be in volume units so that
the RoC value (D809) is in units of volume per minute. The control unit integrates this
volume every second and increments the totalizer for every integer unit.
If the RoC value (D809) is 12 m
3
per minute and the Total factor parameter (P530) is set to
1.0 (m
3
), the Totalizer count (D828) increments every five seconds (1/12th of a minute).
Note
The Totalizer Wizard can be used to set-up pumped volume totalizing.
Table 4-28: Pumped Volume Totalizing Parameters
Parameter Description Factory default
P530 Total factor One count is added to the Totalizer count (D828) for
a quantity defined by P530. 0.0
P531 Total units Pumped volume totalizing is enabled by the totalizer
units (P531) being set to PVol. (This parameter also
defines the display units for parameter D828). None
Related information
Auxiliary functions for relay modes
Set-up totalizing on the Rosemount 3491
Getting started Reference Manual
January 2021 00809-0100-4841
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