8 Commissioning/Shutdown
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PumpDrive 2
along the stop ramp. The minimum period of time between two stops (3-7-3-2)
should therefore be coordinated with the stop ramp time (3-3-5-1). An appropriate
setting is achieved by selecting roughly the same times.
Time Delay_Trigger Criterion (3-7-3-7): This parameter is used to define the sensitivity
of starting and stopping to the respective application. This is the period of time for
which a start or stop condition must be continually fulfilled before a pump is started
or stopped. Reducing the time leads to greater sensitivity. Starting and stopping
occur more quickly, and the risk of switching operations triggered by measurement
outliers increases. Extending the time leads to reduced sensitivity. Starting and
stopping occur more slowly, and the risk of switching operations triggered by
measurement outliers decreases.
8.7.2.3 Automatic pump changeover
In multiple pump configurations, an automatic pump changeover for equalising the
load placed on the pumps can be activated by configuring parameter 3-7-4-1. When
the Runtime setting has been selected, pumps are changed after the defined runtime
(3-7-4-2). When the Runtime with Time of Day setting has been selected, the
changeover takes place at the time set (3-7-4-3) only if the pump has run for at least
the defined runtime. If the pump is stopped, the runtime for this pump is reset.
Table60: Automatic pump changeover parameters
Parameter Description Possible settings Factory setting
3-7-4-1 Automatic Pump Changeover
If this parameter is enabled, pump
changeover will take place after a defined
operating time.
▪ OFF
▪ Runtime
▪ Runtime with Time of Day
OFF
3-7-4-2 Pump Runtime
Runtime of pump up to the next pump
changeover. If the pump is stopped, the
runtime is reset.
0…168 h 24 h
3-7-4-3 Pump Changeover Time
Time at which pumps are changed when
the runtime is exceeded.
0:00 - 23:59 0:00
8.8 Application functions
8.8.1 Aligning the frequency inverter with the pump
The characteristic curves of the pump are described by parameters 3-4-3-1 to 3-4-3-22
and apply at the nominal speed of the pump 3-4-1. The characteristic curves provide
the basis for the following functions:
▪ Flow rate estimation
▪ Operating point monitoring
▪ Stand-by (sleep) mode
▪ Sensorless differential pressure control
▪ Multiple pump configuration
If the frequency inverter is parameterised at the factory, all pump-specific parameters
are already specified.
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