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Page 57 of 277
3.4.2
Channels
Channels are real-time information collected and displayed by the system. Often, channels are
based on a system input that is scaled to engineering units (like Tank Level scaled to feet).
However, channels can also be based on other channels (derived channels).
Examples of Channels:
• Channel based on an analog input (Tank Level, Flowline Pressure)
• Channel based on a downhole tool input (Intake Pressure)
• Derived channel (Average Motor Amps)
Using derived channels and the flexible menu of algorithms provided by the Apollo system allows
for complex control to be programmed without resorting to a PLC.
3.4.3
Triggers
Triggers monitor channel information. They signal significant events or conditions concerning
the pumping system. They are called triggers because they can be used to trigger various
shutdowns, warnings, and other actions. For example, a High Limit trigger tests the value of a
channel against a limit. If the limit is exceeded the trigger is activated (set) and the system state
is affected (depending on the Trigger Action).
Examples of Triggers:
• Tank Level High Trigger-Starts motor if a tank level exceeds the programmed threshold.
• Intake Pressure Low Trigger-Stops the motor if the downhole pump intake pressure is less
than the specified value.
Section 10: Trigger Definition, page 225
of this manual for more information.
3.4.4
Outputs
Outputs connect channel and trigger values to other systems or devices outside the Apollo
system. For example, a digital output could be connected to the Motor Temperature High
trigger. The output could activate a signal to inform a user that the motor had stopped due to
a high temperature.
Select
“Connect this TRIGGER to a DIGITAL OUTPUT” from any Trigger Info screen to attach
an output to a trigger. Or, go to Main Menu, see
Section 4.3 Main Menu, page 88
and select
“Connect a Trigger to Dig Out”. See
Section 5.15 Add a 2nd IO Board, page 165
for more
information.
3.4.5
Example – Input / Channel / Trigger / Output
The diagram below shows a simple example of the various structures in the Well Control System.
Summary of Contents for Apollo 3
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