8 Commissioning/Shutdown
93 of 212
PumpDrive 2
NOTE
The learning procedure can only be run in AUTO / STOPPED operating mode. For
this purpose, the system must be stopped via parameter 1-3-1 or via a digital input,
and the AUTO key must be pressed. AUTO____________STOPPED appears in the
bottommost display row.
Before the learning procedure is started, the valve on the discharge side of the pump
must be closed. The procedure is started via the Start Learning Function parameter
(3-9-6-3). The frequency inverter now starts the pump set and records the power at
different speeds. This procedure lasts approximately half a minute and can be
cancelled by pressing the ESC key. As soon as the learning function has completed (as
indicated on the display) protection against dry running and hydraulic blockage is
active. The valve previously closed can now be opened again.
NOTE
Before the learning function is run, it must be checked whether it is permissible to
operate the pump against the closed valve for a short period. This is not the case
for KSB pumps of the Sewatec and Sewabloc type series.
NOTE
When the minimum speed is changed, the dry-running learning function must be
restarted.
The Hydraulic Blockage Limit parameter (3-9-6-1) can be used to adapt the response
sensitivity for detecting hydraulic blockages. High values translate into a high
response sensitivity. Value "0" deactivates the function. The same applies to the Dry
Running Limit parameter for dry-running detection (3-9-6-2).
Warnings and alerts are output with a time delay in relation to the occurrence of the
triggering events. The time delays are defined in parameters (3-9-6-9) to (3-9-6-11).
Table66: Parameters for dry running protection and protection against hydraulic blockage
Parameter Description Possible settings Factory setting
3-9-6-1 Hydraulic Blockage Limit 0 - 130 % 110 %
3-9-6-2 Dry Run Time Limit 0 - 130 % 85 %
3-9-6-9 Time Delay Hydraulic Blockage Warning 0 - 600 s 5 s
3-9-6-10 Time Delay Hydraulic Blockage Alert 0 - 600 s 10 s
3-9-6-11 Time Delay Dry Running Alert 0 - 600 s 5 s
8.8.2.9 Operating point monitoring
Operating point monitoring generates warning messages if the pump operates
outside the permissible operating range. Excessively low flow rates produce the Low
Flow warning. Excessively high flow rates produce the Overload warning. The
underlying limits can be matched to the pump via the parameters listed (refer to
table on parameters for operating point monitoring). Operating point monitoring is
activated together with flow rate estimation via parameter (3-9-8-1).
NOTE
Operating point monitoring will only function properly if the Inside Pipe Diameters
at Discharge Pressure Measuring Points (3-5-2-1 and 3-5-2-2) parameters have been
entered.
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