Grundfos MAGNA3 Manual page 29

MAGNA3
Digital inputs
You can use the digital input for external control of start
or stop or forced maximum or minimum curve.
Note: If no external on and off switch is connected,
maintain the jumper between the Start/Stop (S/S) and
frame ( ) terminals. This connection is the factory
setting.
M
M
S/S
A
Fig. 39 Digital input in control box
Contact symbol
M
A
M
I
S/S
External start or stop
You can start and stop the pump via the digital input.
Start/Stop
S/S H
H
S/S
NC N0 C
Function
Maximum curve
Minimum curve
Start/Stop
Frame connection
Normal duty
Q
Stop
Q
External forced maximum or minimum curve
You can force the pump to operate on the maximum or
minimum curve via the digital input.
Maximum curve
H
M
A
H
M
A
Minimum curve
H
Normal duty
Q
Maximum curve
Q
Normal duty
Q
Minimum curve
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