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8.4.3 Twin-head pump function
The twin-head pump function allows you to use twin-head pumps
without an external controller, as the two pump heads
communicate via wireless connection.
Operating mode
The pumps are operating in alternating mode, meaning that only
one pump is running at a time. The two pumps change from one
pump to the other every 24 hours with a tolerance of ± 0,5 % per
day.
To control the twin-head pump via the digital Start/Stop input, see
section 8.4.1 Digital input (Start/Stop).
To monitor the twin-head pump via the fault relay output, see
section 3.5.6 Connecting the fault relay output.
9. Fault finding the product
9.1 Grundfos Eye operating status
Grundfos Eye is on when you switch on the power supply.
Grundfos Eye is an indicator light providing information about the
actual pump status. A fault is indicated by a yellow or red
indicator light in Grundfos Eye on the operating panel and in
Grundfos GO Remote.
The indicator light flashes in different sequences and provides
information about the following:
Grundfos Eye Indication Cause Operational state
No lights are on. The power is off. The pump is not running.
Two opposite green indicator lights
running in the direction of rotation of the
pump.
The power is on. The pump is running.
Two opposite green indicator lights are
permanently on.
The power is on. The pump has stopped.
One yellow indicator light running in the
direction of rotation of the pump.
Warning. See section 9. Fault
finding the product.
The pump is running.
One yellow indicator light is permanently
on.
Warning. See section 9. Fault
finding the product.
The pump has stopped.
Two opposite red indicator lights flashing
simultaneously.
Alarm. See section 9. Fault
finding the product.
The pump has stopped.
If the pump impeller is rotated, for example when
filling the pump with water, sufficient energy may be
generated to light up the operating panel even if the
power supply has been switched off.
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