Digital Inputs - Grundfos LFE Instrucciones De Instalación Y Funcionamiento

17.3.5 Buttons on pump
The operating buttons and
to these values:
• Active
• Not active.
When set to Not active (locked), the buttons do not function. Set
the buttons to Not active if the pump should be controlled via an
external control system.
17.3.6 Pump number
A number between 1 and 64 can be allocated to the pump. In the
case of bus communication, a number must be allocated to each
pump.

17.3.7 Digital inputs

The digital inputs of the pump can be set to different functions.
Select one of the following functions:
• Min. (min. curve)
• Max. (max. curve)
• External fault
• Flow switch
• Dry running (from external sensor) (only three-phase pumps).
The selected function is activated by closing the contact between
terminals 1 and 9, 1 and 10 or 1 and 11.
See also section
20.2 Digital input.
All manuals and user guides at all-guides.com
on the control panel can be set
Min.
When the input is activated, the pump will operate according to
the minimum curve.
Max.
When the input is activated, the pump will operate according to
the maximum curve.
External fault
When the input is activated, a timer will be started. If the input is
activated for more than 5 seconds, the pump will be stopped and
a fault will be indicated. If the input is deactivated for more than 5
seconds, the fault condition will cease and the pump can only be
restarted manually by resetting the fault indication.
Flow switch
When this function is selected, the pump will be stopped when a
connected flow switch detects low flow.
It is only possible to use this function if the pump is connected to
a pressure sensor.
If the input is activated for more than 5 seconds, the stop function
incorporated in the pump will take over. See section
function.
Dry running
When this function is selected, lack of inlet pressure or water
shortage can be detected. This requires the use of an accessory,
such as these:
®
• a Grundfos Liqtec dry-running sensor
• a pressure switch installed on the suction side of a pump
• a float switch installed on the suction side of a pump.
When lack of inlet pressure or water shortage (Dry running) is
detected, the pump will be stopped. The pump cannot restart as
long as the input is activated.
17.3.8 Stop
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