OMNI 4000/7000 Operations and Maintenance Guide – Rev F
The Startup and Shutdown Ramp entries are used to specify the maximum speed
that the valve can open or close during startup or shutdown conditions. This is
entered as a percentage of allowed movement per half second, so an entry of 1%
per 1/2 second would require 50 seconds to move the valve from the fully closed to
the fully open position. Note that the ramping control has no effect during normal
operations.
For example, you can activate the PID Loop 1 start command 2013, and set the PID
Loop 1 permissive 2001 and 2007 to “ON.” This action starts ramping the flowrate
toward the setpoint. When the delivery is almost complete, activate the PID Loop 1
shutdown command 2025, which resets the PID Loop 1 permissive 2001 and
causes the flowrate to ramp down to the minimum valve open percentage. Last,
terminate the delivery by activating PID Loop 1 Stop command 2019, resetting 2007
and causing the valve to close completely.
Click Apply to save your changes.
3.8 User Displays
The flow computer allows up to 10 configurable user display screens, each with up to 20 Modbus
points. These screens are configured in OMNICONNECT, and then the chosen information is
displayed through the front panel (see Section 6.5 User Displays).
For example, in the Meter 1 real-time user display in Figure 3-3, all 20 points are listed, but not all
are used. The settings an Operator can fill out for each point include:
• Register – the Modbus register of the point
• Description – a 32-character alphanumeric description
• Units – the engineering units of the register variable
• Hex – an option for the value to be displayed in hexadecimal format (check for yes)
• Exp. Notation – an option for the value to be displayed in exponential notation (check for yes)
• Precision – an option to select the precision if the register is float or a double
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