Setting Values For Control Modes; Flow Estimation Accuracy - Grundfos MAGNA3 D Instrucciones De Instalación Y Operación

8.6 Setting values for control modes

The setting values for FLOW
ADAPT
"Settings" menu. The maximum flow is a theoretical value corresponding to H = 0. The actual maximum flow depends on the system
characteristics.
Single-head pump type
MAGNA3 32-60 F (N)
MAGNA3 32-100 F (N)
MAGNA3 40-80 F (N)
MAGNA3 40-120 F (N)
MAGNA3 40-180 F (N)
MAGNA3 50-80 F (N)
MAGNA3 50-150 F (N)
MAGNA3 65-120 F (N)
MAGNA3 65-150 F (N)
MAGNA3 80-100 F (N)
MAGNA3 100-120 F (N)
Twin-head pump type
MAGNA3 (D) 65-150 F
MAGNA3 (D) 80-100 F
MAGNA3 (D) 100-120 F
The duty ranges for proportional-pressure and constant-pressure control appear in the MAGNA3 data booklet.
In constant-curve duty, you can control the pump from minimum to 100 %. The range of control depends on the minimum speed, power
and pressure limits of the pump.

8.7 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 . The less flow through the pump, the less accurate the
max
reading will be. See also section 8.11.5 Heat energy monitor.
Example:
H
Min.
Fig. 39 Q
max
and FLOW are indicated in % of maximum flow, but you must enter the value in m
LIMIT
AUTO
ADAPT
Q
max
H
fac
3
[ft (m)] [gpm (m /h)]
11.5 (3.5) 48.5 (11.0)
18.1 (5.5) 57.3 (13.0)
14.8 (4.5) 94.7 (21.5)
21.3 (6.5) 112.2 (25.5)
31.2 (9.5) 125.4 (28.5)
14.8 (4.5) 129.8 (29.5)
26.2 (8.0) 165.0 (37.5)
21.3 (6.5) 209.0 (47.5)
26.3 (8.0) 268.6 (61.0)
18.1 (5.5) 303.9 (69)
21.3 (6.5) 374.3 (85)
26.2 (8.0) 248.6 (56.5)
18.0 (5.5) 297.0 (67.5)
21.3 (6.5) 345.4 (78.5)
Max.
Q
Q
max
FLOW
ADAPT
Q Q
fac min
3
[gpm (m /h)] [gpm (m
26.0 (5.9) 12.4 (2.8)
29.5 (6.7) 14.6 (3.3)
57.2 (13) 23.8 (5.4)
70.4 (16) 28.2 (6.4)
66.0 (15) 31.2 (7.1)
74.8 (17) 32.6 (7.4)
88.0 (20) 41.4 (9.4)
132.0 (30) 52.4 (11.9)
176.2 (40.0) 67.4 (15.3)
207.0 (47) 76.0 (17.3)
251.0 (57) 93.6 (21.6)
176.0 (40) 62.0 (14.1)
206.8 (47) 74.4 (16.9)
250.8 (57) 86.2 (19.6)
1. MAGNA3 65-60 has a Q
max
Typically 5 % accuracy means 2 m
3
m /h.
2. This accuracy is valid for the entire QH area. If the pump
3
indicates 10 m /h, the measurement is 10 ± 2 m
3. The flow rate can be from 8-12 m
The use of a mixture of water and ethylene-glycol will reduce the
accuracy.
If the flow is less than 10 % of Q
See section 8.8 Flow accuracy table, section 8.9 External
connections, for flow accuracy calculations of the complete
MAGNA3 range.
3
/h in the
/ FLOW
LIMIT
25 % Q 90 %
max
3 3
/h)] [gpm (m /h)]
43.6 (9.9)
51.6 (11.7)
85.4 (19.4)
101.2 (23)
113.1 (25.7)
117.0 (26.6)
148.7 (33.8)
188.3 (42.8)
241.8 (54.9)
273.5 (62.1)
337.0 (76.5)
224.0 (50.9)
267.5 (60.8)
311.1 (70.7)
3
of 40 m /h.
3
/h inaccuracy of Q ± 2
max
3
/h.
3
/h.
, the display shows a low flow.
max
29