Davey Speedman Dual Pump Variable Speed Pump Control System - Manual (Page 25)

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Friction Loss
Friction loss is the figure that is added to the Set Point to compensate for Friction in a
pipeline. The setting increases the Set Point Pressure based on the calculated flow
rate. The increase in Set Point is proportional to the calculated flow rate. The input
figure is the total additional pressure required when all of the nominated pumps are operating.
Set Point 2 - 8
The Speedman has the option to set 8 Set Points that can be triggered by a Digital
Input or via a time of day event. This allows a variation to the main Set Point to be
made remotely.
It changes the main Set Point to the value nominated in alternate Set Points 2 through 8. To select this option,
an input is programmed to function as Set Point 2 to 8 and is activated by closing the contact between the
nominated input and the Input Common OR by using the timed Set Point feature.
Screens Set Point 2 – 8 are hidden unless an input is nominated as the corresponding set point within the
INPUTS menu or a timed set point option is set.
Pressure Trip 1 Low
The Speedman has the ability to energise an output relay based on a nominated
system pressure. This can be useful to signal other elements of a system not
under control of the Speedman. See Output Relays for information on how to set
this feature.
Pressure Trip 1 - the designated relay will energize on reaching Pressure Trip 1 entered value (either Pressure
Trip Low and/or Pressure Trip 1 High).
Set Point 2
XXXX
Press Trip 1 Low
XXXX
Friction Loss
XXX
Linear Friction Loss
NB. Make sure that the friction loss figure is less than the difference between the highest Set Point &
High Pressure Limit.
Exponential Friction Loss