External Connections; Priority Of Settings - Grundfos MAGNA3 25-80 Installation And Operating Instructions Manual

7.7 External connections

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.
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. 43.
• Plug-connected versions:
Connect the cable screen to earth via cable clamp. See fig.
44.
Fig. 43 Connection of cable screen, terminal-connected
versions
Fig. 44 Connection of cable screen, plug-connected versions

7.8 Priority of settings

The external forced-control signals influence the settings
available on the pump operating panel or with Grundfos GO.
However, you can always set the pump to maximum-curve duty or
stop the pump on the operating 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 operating panel or Grundfos GO can only set the pump
to maximum curve.
Possible settings
Operating
Priority
panel or
Grundfos GO
1 "Stop"
2 "Max. curve"
3
4
5
6
7
8
9 "Min. curve"
10
11 "Start"
External
Bus signal
signals
"Stop"
"Stop"
"Max. curve"
"Min. curve"
"Start"
"Max. curve"
"Min. curve"
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