Digital Inputs - Grundfos MAGNA3 Montage- Und Betriebsanleitung

4.5.1 Relay outputs
See fig. 10, pos. 1.
The pump incorporates 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.
The relays can be used for outputs up to 250 V and 2 A.
Relay 1
NC NO C
Operation
Alarm
Fig. 11 Relay output
Contact symbol
NC
NO
C
The functions of the signal relays appear from the table below:
Signal relay Alarm signal
Not activated:
• The power supply has been switched off.
1 2 3
1 NC NO C 2 3
• The pump has not registered a fault.
NC NO C
Activated:
• The pump has registered a fault.
1 2 3
NC NO C
Signal relay Ready signal
Not activated:
• The pump has registered a fault and is
1 2 3
1 NC NO C 2 3
unable to run.
NC NO C
Activated:
• The pump has been set to stop, but is ready
to run.
1 2 3
NC NO C
• The pump is running.
Signal relay Operating signal
Not activated:
1 2 3 • The pump is not running.
1 NC NO C 2 3
NC NO C
Activated:
• The pump is running.
1 2 3
NC NO C
18
Relay 2
NC NO C
Function
Normally closed
Normally open
Common

4.5.2 Digital inputs

See fig. 10, pos. 2.
The digital input can be used for external control of start/stop or
forced max. or min. curve.
If no external on/off switch is connected, the jumper between
terminals Start/Stop (S/S) and frame ( ) should be maintain ed.
This connection is the factory setting.
M M
A I
Start/stop
Fig. 12 Digital input
Contact symbol
M
A
M
I
S/S
External start/stop
The pump can be started or stopped via the digital input.
Start/stop
S/S
H
S/S H
S/S
Leakage protection
Function
Max. curve
100 % speed
Min. curve
25 % speed
Start/Stop
Frame connection
Normal duty
Note: Factory setting with
jumper between S/S and
Q
Stop
Q
.