Brochure

Installation
MAGNA3
7
16
Digital inputs
The digital input can be used for external control of
start/stop or forced max. or min. curve.
Note: If no external on/off switch is connected, the
jumper between terminals Start/Stop (S/S) and frame
( ) should be maintained. This connection is the
factory setting.
Fig. 13 Digital input in control box
External start/stop
The pump can be started or stopped via the digital
input.
External forced max. or min curve
The pump can be forced to operate on the max. or min.
curve via the digital input.
Relay outputs
The pump has two signal relays with a potential-free
changeover contact for external fault indication.
The function of the signal relay can be set to "Alarm",
"Ready" or "Operation" on the pump control panel or
with the Grundfos GO Remote.
Fig. 14 Relay output in control box
The functions of the signal relays are as shown in the
table below:
TM05 3343 1212
Contact symbol Function
M
A
Max. curve
M
I
Min. curve
S/S Start/Stop
Frame connection
Start/stop
Normal duty
Stop
Max. curve
Normal duty
Max. curve
S/S
M
I
M
A
S/S
Q
H
S/S
Q
H
M
A
Q
H
M
A
Q
H
Min. curve
Normal duty
Min. curve
TM05 3343 1212
Contact symbol Function
NC Normally closed
NO Normally open
CCommon
Signal relay Alarm signal
Not activated:
• The power supply has been switched off.
• The pump has not registered a fault.
Activated:
• The pump has registered a fault.
Signal relay Ready signal
Not activated:
• The pump has registered a fault and is unable to
run.
Activated:
• The pump has been set to stop, but is ready to run.
• The pump is running.
Signal relay Operating signal
Not activated:
• The pump is not running.
Activated:
• The pump is running.
Q
H
Q
H
NC N0 C
132
NC NO C
132
NC NO C
12 3
NC NO C
132
NC NO C
132
NC NO C
12 3
NC NO C
132
NC NO C
132
NC NO C
12 3
NC NO C