8 Commissioning/Shutdown
109 of 212
PumpDrive 2
Pipe flushing
Closed-loop control mode is required for pipe flushing. Pipe flushing is not possible in
open-loop control mode or manual mode. Pipe flushing is triggered manually by
activating the Immediate Pipe Flushing parameter (1-3-7) at the control panel or by
minimum flow velocity monitoring (3-9-9-1). When pipe flushing is triggered, control
to achieve a constant pipe flushing flow velocity (3-9-9-5) is activated in addition to
routine control. Control at the higher speed takes priority so that either the pipe
flushing flow velocity is achieved or, if the routine operative control task so requires,
exceeded. Pumps operated in a multiple pump configuration are started and stopped
as required. Pipe flushing ends after the defined time (3-9-9-4).
Table77: Monitoring minimum flow velocity and pipe flushing
Parameter Description Possible settings Factory setting
1-3-7 Immediate Pipe Flushing
This function allows the pipe flushing function
to be started manually once.
Run
3-9-9-1 Flow Velocity Monitoring
Activates flow velocity monitoring. Depending
on the selection made, a warning is output
when the value defined in 3-9-9-2 is undershot,
and the pipe flushing function may also be
started.
▪ OFF
▪ Warning
▪ Warning +Pipe Flushing
OFF
3-9-9-2 Minimum Flow Velocity
The minimum flow velocity set here must be
undershot for a configurable period of time so
that the pipe flushing function starts or a
warning is displayed, depending on the
configuration.
0,0…10,0 m/s 2,0
3-9-9-3 Time Delay, Flow Velocity Monitoring
Configurable period of time for which the
minimum flow velocity must be continually
undershot so that the pipe flushing function
starts.
0…168 h 24
3-9-9-4 Duration of Pipe Flushing
Duration of the pipe flushing cycle during which
alternative control is active
0…120 min 2
3-9-9-5 Pipe Flushing Flow Velocity
Flow velocity value during flushing
0,0…10,0 m/s 4,0
3-9-9-6 Inside Pipe Diameter of System Pipe diameter
of system
0…5000 mm 0
8.8.5 Ramps
Start and stop ramps (open-loop control mode/manual mode, closed-loop control
mode)
Starting and stopping take place via speed ramps. A distinction is made between a
start ramp and a stop ramp. The ramps are defined via parameters 3-3-5-1, 3-3-5-2
and 3-2-2-2. In open-loop control mode, the start ramp is left when the control value
is reached. In closed-loop control mode, the start ramp is left when the speed defined
by the controller is reached. The stop ramp is activated as soon as a stop signal is
issued.
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