64
Flashes red
Under/overvoltage
Power supply too low/high
on mains side
Check mains voltage
and operating
conditions, and
request customer
service
Excessive module
temperature
Module interior too warm
Short-circuit Motor current too high
Flashes
red/green
Generator operation
Water is flowing through
the pump hydraulics, but
there is no mains voltage
at the pump
Check the mains
voltage, water
quantity/pressure
and the ambient
conditions
Dry run Air in the pump
Overload
Sluggish motor, pump is
operated outside of its
specifications (e.g., high
module temperature).
The speed is lower than
during normal operation.
Table 11 - List of faults and solutions
Reading performance curve
For a given speed, the pump can overcome a given pressure drop, for a given flow:
- The pressure drop (or manometric height) is identified on the ordinate axis, with the units in metres (m) - It depends on the
installation.
- The flow rate is identified on the x-axis, with the units in cubic metres per hour (m
3
/h) - Depends on the power to be conditioned.
- Constant velocity curves are present in the graph, identified in I, II and III.
- The installer must set the required curve from the lowest to the highest speed by means of the required flow rate and the head
loss of the installation.
- The pumps run at the highest speed in the factory.
Figure 66 - Pump performance - Constant speeds I, II and III
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