Grundfos Magna Installation And Operating Instruction

6
• Constant curve.
The external analog signal will control the pump curve within the range
from the min. curve to the constant curve selected according to the char-
acteristic in fig. 2.
• Proportional-pressure or constant-pressure control.
The external analog signal will control the setpoint for the pump head be-
tween the setpoint corresponding to the min. curve and the setpoint se-
lected according to the characteristic in fig. 2.
At an input voltage lower than 0.5 V, the pump will operate according to the
min. curve. The setpoint cannot be changed.
The setpoint can only be changed when the input voltage is higher than
0.5 V.
Fig. 2
Note:
• The max. curve input must be open.
• The min. curve input must be closed.
See connection examples on pages 103 to 106.
The examples below illustrate the use of an analog control voltage in con-
nection with a pump in constant-pressure control mode:
Fig. 3
Note: As will appear from the above figure, the control range will be reduced
if the setpoint of the pump, H
set
, is set to a lower value.
TM00 5550 0904
TM01 1384 4497 TM01 1385 4497
890107654321
m
V
H
U
Max. setpoint/constant curve
Setpoint set/constant curve
Min. curve
10
8,6
7,2
5,8
4,3
3,0
1,5
0,5
0
V
U
H
set
10
7,5
5,0
2,5
0,5
0
V
U
H
set

Grundfos Magna Specifications

General

Frequency	50/60 Hz
Temperature Range	-10 °C to +110 °C
Type	Circulator Pump
Maximum Operating Pressure	10 bar
Insulation Class	F
Series	Magna
Material	Cast iron
Voltage	1 x 230 V / 3 x 400 V (depending on model)