• Set the parameter 74.24 = Not selected.
or
• Enable start command with level-trigger (par. 20.02 = Level) and stop the drive
using the defined source.
￭
Settings and diagnostics
Parameters 74.24 and 74.25.
Events D211 Automatic restart active and D20F Automatic restart active.
Pump curves
Q-H pump curves typically provided by the pump manufacturer can be used for
the actual flow rate estimation, provided that total dynamic head measurement
is available. You can connect both, intake and discharge pressure measurement
signals directly to the drive through analog inputs of Fieldbus.
ESP control program allows you to enter up to five Q-H curves for the pump running
at corresponding frequencies. The flow estimate calculation is then completed
based on motor actual speed and head (pressure) measurement input. For the
speeds beyond the frequency range covered by the pump curves, the flow estimate
is then based on affinity law.
Note: In case actual flow rate is already measured with a flow-meter, then you can
configure the same Q-H curves to be used opposite way around, i.e. for indirect
estimate of the total dynamic head.
64 ESP program features
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