Grundfos MAGNA3 D 32-80 180 97924451 [21/1656] Input and output communication
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Grundfos MAGNA3 D 32-80 180 97924451 [21/1656] Input and output communication

Grundfos MAGNA3 D 32-80 180 97924451 [21/1656] Input and output communication
English (GB)
21
The connection terminals of plug-connected versions differ from
those of terminal-connected versions, but they have the same
function and connection options.
Concerning demands on signal wires and signal transmitters, see
section 12. Technical data.
Use screened cables for external on-off switch, digital input,
sensor and setpoint signals.
Connect screened cables to the earth connection as follows:
• Terminal-connected versions:
Connect the cable screen to earth via the digital-input
terminal. See fig. 25.
• Plug-connected versions:
Connect the cable screen to earth via cable clamp. See fig.
26.
7.3 Input and output communication
• Relay outputs
Alarm, ready and operating indication via signal relay.
• Digital input
– Start and stop (S/S)
– Minimum curve (MI)
– Maximum curve (MA).
• Analog input
0-10 V or 4-20 mA control signal.
To be used for external control of the pump or as sensor input
for the control of the external setpoint.
The 24-V supply from pump to sensor is optional and is
normally used when an external supply is not available.
7.4 Priority of settings
The external forced-control signals influence the settings
available on the pump control panel or with Grundfos GO.
However, you can always set the pump to maximum-curve duty or
stop the pump on the control panel or with Grundfos GO.
If two or more functions are enabled at the same time, the pump
operates according to the setting with the highest priority.
The priority of the settings is as shown in the table below.
Example: If the pump has been forced to stop via an external
signal, the control panel or Grundfos GO can only set the pump to
maximum curve.
7.4.1 Relay outputs
See fig. 25, pos. 1.
The pump has two signal relays with a potential-free changeover
contact for external fault indication.
You can set the function of the signal relay to "Alarm", "Ready" or
"Operation" on the control panel or with Grundfos GO.
The relays can be used for outputs up to 250 V and 2 A.
WARNING
Electric shock
Minor or moderate personal injury
- Separate wires connected to supply terminals,
outputs NC, NO, C and start-stop input from each
other and from the supply by reinforced insulation.
Make sure that all cables are heat-resistant up to
75 °C.
Install all cables in accordance with EN 60204-1
and EN 50174-2:2000.
Connect all cables in accordance with local
regulations.
WARNING
Electric shock
Death or serious personal injury
- Separate input voltages from external equipment
from live parts by reinforced insulation.
Priority
Possible settings
Control panel
or Grundfos
GO
External
signals
Bus signal
1"Stop"
2"Max. curve"
3 "Stop"
4 "Stop"
5 "Max. curve"
6"Min. curve"
7"Start"
8"Max. curve"
9 "Min. curve"
10 "Min. curve"
11 "Start"
Warnings do not activate the alarm relay.
Use C and NC for fault signals as this enables serial
connections of more relays and detection of signal
cable defects.

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