Lowara e-SVE - Page 40

en – Original instructions
40
Calculation of Effective Required Value in Cascade Serial (MSE):
K = number of active pumps
Pr = pump priority
P02 (Actual Required Value) = P01 (Required Value) + (K – 1) * P58 (Actual Value Increase) –
(Pr – 1) * P59 (Actual Value Decrease)
Calculation of Effective Required Value in Cascade Synchronous (MSY):
K = number of active pumps (K ≥ Pr)
P02 (Actual Required Value) = P01 (Required Value) + (K – 1) * (P58 – P59)
Behaviour of P58 (Actual Value Increase) and P59 (Actual Value Decrease):
 if P58 (Actual Value Increase) = P59 (Actual Value Decrease) → Pressure constant,
independent of how many pumps are in operation.
 if P58 (Actual Value Increase) > P59 (Actual Value Decrease) → Pressure rises when assist
pump switches on.
 if P58 (Actual Value Increase) < P59 (Actual Value Decrease) → Pressure decreases when
assist pump switches on.