Bell-gossett 193 TECHNOVAR VARIABLE SPEED PUMP CONTROLLER AND I Uživatelský manuál stáhnout pdf (Strana 55)

Operating Instruction

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

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

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

pump and the

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 77 78

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Bell-gossett 193 TECHNOVAR VARIABLE SPEED PUMP CONTROLLER AND I Uživatelský manuál Strana 55