English (GB)
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8.2.1 Fault finding, twin-head pump
A yellow indicator light in a twin-head pump system (warning 77)
means that the two heads have lost connection to each other.
This is often intermittent and caused by external disturbance, or
because one of the heads has lost power.
The warning will be shown immediately and will trigger the fault
relays after one hour. If communication is re-established, the
warning is automatically reset.
It is possible to choose whether warning 77 should trigger the
fault relays or not. This is done in Grundfos GO:
Step Action Illustration
1
Choose
"Settings" in the
Grundfos GO
dashboard.
TM06 8584 0817
2
Select "Warning
77 relay
settings".
TM06 8583 0817
3
By default the
fault relay
setting is
activated.
To disable the
setting, choose
"Do not activate
relay".
Press "OK".
CAUTION
Pressurised system
Minor or moderate personal injury
- Before dismantling the pump, drain the system or
close the isolating valve on either side of the
pump. The pumped liquid may be scalding hot and
under high pressure.
WARNING
Electric shock
Death or serious personal injury.
- Switch off the power supply for at least 3 minutes
before you start any work on the product. Lock the
main switch in position 0. Type and requirements
as specified in EN 60204-1, 5.3.2.
WARNING
Electric shock
Death or serious personal injury.
- Make sure that other pumps or sources do not
force flow through the pump even if the pump is
stopped.
If the power supply cable is damaged, it must be
replaced by the manufacturer, the manufacturer's
service partner or a similarly qualified person.
Step Action Illustration
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