Warning 77, Twin-Head Pump - Grundfos MAGNA1 C Series Installation And Operating Instructions Manual

9.5 Warning 77, twin-head pump

A yellow Grundfos Eye in a twin-head pump system often means
that the two heads have lost connection to each other, warning
77. This is often intermittent and caused by external disturbance,
or because one of the heads has lost power.
The warning is shown immediately and triggers the fault relay
after one hour. If communication is re-established, the warning is
automatically reset.
9.5.1 Activating and deactivating the fault relay
It is possible to choose whether warning 77 should trigger the
fault relay or not. This is done in Grundfos GO. For instructions
on how to connect the pump to Grundfos GO, see section
8.3 Connecting the pump to Grundfos GO
Step Action
Choose
"Settings" in the
1 Grundfos GO
Remote
dashboard.
Choose
2 "Warning 77
relay settings".
Remote.
Illustration
Step Action
By default the
fault relay
setting is
activated.
3 To disable the
setting, choose
"Do not activate
relay".
Press "OK".
Illustration
31