Is there a way to control the flow of a pump?
The modulating control element is usually either a rising stem flow control valve or a variable frequency drive on the pump’s electric motor. While these methods are a proven way to control the flow of a pump, there are applications where such a setup is not desirable.
How to prevent over-filtering in signal filtering?
Prevent over-filtering by simultaneously optimizing loop tuning and filter parameters. Click here for a version of this article with much more background on noise and explanation of filter types.
Which is an example of filtering in control?
Filtering is the modification of a measured or calculated signal—using an algorithm and/or logic—to remove undesirable aspects of the signal before it is used in a calculation or a controller. Examples in control are the feedback (or controlled) variable to a PID or APC controller, or the input to a feedforward controller.
What does C stand for in signal filtering?
c ): Also referred to as the corner frequency, this is the frequency or frequencies that define(s) the limits of the filter range(s). It is the desirable cut-off point for the filter. • Stop Band: The range of frequencies that is filtered out. • Pass Band: The range of frequencies which is let through and recorded.
When does a fire pump alarm phase reversal?
10.4.7.2.3 Phase Reversal. (See 10.4.6.2.) This fire pump alarm circuit shall be energized by a separate reliable supervised power source or from the pump motor power, reduced to not more than 125 V. The fire pump alarm shall actuate whenever the three-phase power at the line terminals of the motor contactor is reversed.
What are the signals for a fire pump?
10.4.7.2 These fire pump alarms and signals shall indicate the information in 10.4.7.2.1 through 10.4.7.2.4. 10.4.7.2.1 Pump or Motor Running. The signal shall actuate whenever the controller has operated into a motor-running condition.
What does a flashing Flo on a circ pump mean?
Typically Solid FLO msgs are related to a blockage, bad Flow switch and or connection, summer logic, bad PWA. Typically the circ pump would be off with a Solid FLO. A Flashing FLO msg could mean other things like a soiled filter, low water level, stuck weir door (not enough water supply to circ pump).
What are the rules for a fire pump alarm?
10.4.7* Fire Pump Alarm and Signal Devices Remote from Controller. 10.4.7.1 Where the pump room is not constantly attended, audible or visible signals powered by a source not exceeding 125 V shall be provided at a point of constant attendance.
