Generally – Bell & Gossett 193 TECHNOVAR VARIABLE SPEED PUMP CONTROLLER AND INTEGRATED AJUSTABLE FREQUENCY DRIVE User Manual
Page 55
Operating Instruction
55
Press for about 3 seconds to enter the submenu and the display changes to
10.22.1 Lift Value
ACTU. VALUE INC.
5 psi
Adjustable between 0.0 to the pre-selected
Sensor range
Application Example:
1) Pump 1 reaches fmax (maximum speed)
2) Pressure falls and reaches the start-value of the 2
nd
pump
(= REQUIRED VALUE – ACTU. VALUE DEC.)
3) Pump 2 is switched on automatically
4) The required value is calculated new, after the start of the 2
nd
pump in the following
way!
New required value = REQUIRED VALUE – ACTU. VALUE DEC. + ACU. VALUE INC.
Generally:
k ... Number of active pumps (k >1)
p = p
set
+ (k-1)*[lift value – fall value]
· Lift value = Fall value Þ Pressure constant when pumps switch on
· Lift value > Fall value Þ Pressure rises when lag-pump switches on
· Lift value < Fall value Þ Pressure falls when lag-pump switches on
Press on the Technovar to change to
10.22.2 Fall Value
For calculation of the set pressure after start of pumps 2 to 4
ACTU. VALUE DEC.
2.1 psi
Adjustable from 0,0 to pre-selected Sensor range
determines the start-value of the 2
nd
pump and the
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