Priority Of Settings; Control Without Bus Signal, Local Operating Mode; Control With Bus Signal, Remote-Controlled Operating Mode; External Control Signals - Grundfos CUE Series Installation And Operating Instructions Manual

12. Priority of settings

The On/Off button has the highest priority. In "off"
On/ On/
Off
condition, pump operation is not possible.
The CUE can be controlled in various ways at the same time.
If two or more operating modes are active at the same time,
the operating mode with the highest priority will be in force.

12.1 Control without bus signal, local operating mode

Priority CUE menu
1 Stop
2 Max.
3
4
5 Min.
6 Normal
Example: If an external signal has activated the operating mode
Max., it will only be possible to stop the pump.
12.2 Control with bus signal, remote-controlled
operating mode
Priority CUE menu External signal
1 Stop
2 Max.
3 Stop
4
5
6
Example: If the bus signal has activated the operating mode
Max., it will only be possible to stop the pump.

13. External control signals

13.1 Digital inputs

The overview shows functions in connection with closed contact.
Terminal Type Function
18 DI 1 • Start/stop of pump
• Min. (min. curve)
• Max. (max. curve)
• Ext. fault (external fault)
19 DI 2 • Flow switch
• Alarm reset
• Dry running (from external sensor)
• Not active.
• Min. (min. curve)
• Max. (max. curve)
• Ext. fault (external fault)
32 DI 3 • Flow switch
• Alarm reset
• Dry running (from external sensor)
• Not active.
External signal
The same function must not be selected for more than one input.
See fig. 21.

13.2 External setpoint

Stop
Max.
Min.
Normal
The setpoint can be remote-set by connecting an analog signal
transmitter to the setpoint input (terminal 53).
Open loop
In control mode Open loop (constant curve), the actual setpoint
can be set externally within the range from the min. curve to the
setpoint set via the CUE menu. See fig. 56.
Bus signal
Stop
Max.
Min.
Normal
Terminal Type Function
• Min. (min. curve)
• Max. (max. curve)
• Ext. fault (external fault)
• Flow switch
33 DI 4
• Alarm reset
• Dry running (from external sensor)
• Accumulated flow (pulse flow)
• Not active.
Terminal Type Function
53 AI 1 • External setpoint (0-10 V)
Setpoint
Max. curve
Setpoint, CUE menu
Actual setpoint
Min. curve
0
Ext. setpoint signal
Fig. 56 Relation between the actual setpoint and the external
setpoint signal in control mode Open loop
Actual
setpoint
range
10 V
39