Grundfos Control MPC-Serie Installationsanleitung Seite 56

8.7.47 Flow estimation (4.3.23)
Fig. 98 Flow estimation
Description
As described in section 8.7.43 Pump curve data
can optimise operation according to performance curves and
motor data. In this display, you can select the curve types which
CU 352 uses for the optimisation if they are available.
At large flow rates, there may be a considerable head loss
between the pump outlet flange and the pressure sensor. The
loss is caused by non-return valves and pipe bends. To improve
the flow estimation of the system, it is necessary to compensate
for the difference between the measured and the actual
differential pressure across the pump. This is done by entering
the head loss in non-return valves and pipe bends at the rated
flow rate of one pump.
Setting range
• 2nd order QH polynomial
• 5th order QH polynomial
• Power polynomial, QP
• Head loss.
It is possible to select several curve types, as CU
352 makes a priority based on the data available.
Setting via the operating panel
• Settings > Secondary functions > Flow estimation.
Factory setting
All polynomials are selected.
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8.7.48 Reduced operation (4.3.24)
Fig. 99 Reduced operation
Description
(4.3.19), CU 352 The function allows you to limit the number of pumps in operation,
or for MPC-E systems, to limit power consumption. The limit is
activated by a digital input.
Setting range
• Setting of digital input
• Setting of digital output
• Maximum number of pumps in operation.
• Maximum power consumption.
Setting via the operating panel
• Settings > Secondary functions > Reduced operation.
1. Select: Go to setting of digital input.
2. Select digital input.
3. Select: Reduced operation.
4. Press [Back] x 2.
5. Select: Go to setting of digital output.
6. Select digital output.
7. Select: Reduced operation.
8. Press [Back] x 2.
9. Set: Number of pumps in operation or Power consumption.
Factory setting
No digital input is selected (disabled).
(8.7.28 Digital inputs (4.3.7)).
(8.7.33 Digital outputs (4.3.9)).