Grundfos MAGNA3 D 32-80 180 97924451 [44/1656] External setpoint influence
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Grundfos MAGNA3 D 32-80 180 97924451 [44/1656] External setpoint influence

Grundfos MAGNA3 D 32-80 180 97924451 [44/1656] External setpoint influence
English (GB)
44
"Heat energy"
Navigation
"Home" > "Status" > "Heat energy monitor" > "Heat energy"
"Heat energy"
You can measure both heating and cooling in the same system. If
a system is used for both heating and cooling, two counters are
automatically shown in the display.
The time stamp of the date indicates the latest use of the specific
counter.
The value of "latest year (2)" represents the last 52 consecutive
weeks where the pump has been supplied with power. The user
can reset the value manually.
8.9 External setpoint influence
External setpoint influence is typically used to control the speed
according to a setpoint by means of a 0-10 V signal.
Follow the step-by-step guide to complete the sensor input setup.
Start with the unit display and end with the summary display.
1. Check the entered values.
2. Press [OK] to confirm and enable the settings.
3. Return to the "Settings" menu and find "External setpoint
function".
4. Choose "Linear with MIN" function. See section "
External
setpoint function
".
8.10 Flow estimation accuracy
The internal sensor estimates the difference in pressure between
the inlet and outlet port of the pump. The measurement is not a
direct differential-pressure measurement, but by knowing the
hydraulic design of the pump, you can estimate the differential
pressure across the pump. The speed and power give a direct
estimation of the actual duty point at which the pump is running.
The calculated flow rate has an accuracy specified as +/- xx % of
Q
max
. The less flow through the pump, the less accurate the
reading will be. See also section 8.8.6 "
Heat energy monitor
".
Example:
Fig. 58 Q
max
1. MAGNA3 65-60 has a Q
max
of 40 m
3
/h.
Typically 5 % accuracy means 2 m
3
/h inaccuracy of Q
max
+/- 2
m
3
/h.
2. This accuracy is valid for the entire QH area. If the pump
indicates 10 m
3
/h, the measurement is 10 +/- 2 m
3
/h.
3. The flow rate can be from 8-12 m
3
/h.
The use of a mixture of water and ethylene-glycol mixture will
decrease the accuracy.
If the flow is less than 10 % of Q
max
, the display shows a low flow.
8.11 Pump heads in twin-head pumps
The twin-head pump housing has a flap valve on the outlet side.
The flap valve seals off the port of the idle pump housing to
prevent the pumped liquid from running back to the inlet side. See
fig. 59. Due to the flap valve there is a difference in the hydraulic
between the two pump heads. See fig. 60.
Fig. 59 Twin-head pump housing with flap valve
Fig. 60 Hydraulic difference between the two pump heads
2.1.6.2.0.0 Heat energy
TM05 2448 5111TM06 1565 2514TM06 1566 2514
H
Q
Max.
Min.
Qmax
H
Q
Right pump head
Left pump head

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