Grundfos MAGNA Manual Del Usuario página 13

The pump has these operating modes:
• Alternating operation
Pump operation alternates every 24 hours. If the duty pump stops due to a
fault, the other pump will start.
• Standby operation
One pump is operating continuously. In order to prevent seizing-up, the
other pump will start at a fixed frequency. If the duty pump stops due to a
fault, the other pump will start.
Select the operating mode by means of the mechanical contact in each mod-
ule.
Operating mode
Alternating
Standby
Standby
Standby
Standby operation
Fig. 5 Mechanical contact
Operating the pump
The connected pumps can be set and operated in the same way as single-
head pumps. The duty pump uses its setpoint setting, whether it was made
on the control panel, with the R100 or via bus.
Note: Both pumps should be set to the same setpoint and control mode.
Different settings will result in different operation when changing between
the two pumps.
Left pump head
Alternating
Alternating
Standby
Standby
Alternating operation
Right pump head
Alternating
Standby
Alternating
Standby
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