KSB PumpDrive 2 - Individual Monitoring Functions; Service Interval; Flow Rate Estimation

8 Commissioning/Shutdown
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PumpDrive 2
8.8.2.11 Individual monitoring functions
An upper and lower limit value (parameters 3-10-1-1 to 3-10-11-3) can be defined for
the following operating values:
▪ Power
▪ Current
▪ Speed
▪ Setpoint
▪ Actual Value
▪ Flow rate
▪ Suction pressure
▪ Discharge pressure
▪ Differential pressure
▪ Frequency
▪ Temperature
When these limit values are undershot or overshot, a warning is triggered after a
continuous time delay that is defined (3-10) has lapsed.
8.8.2.12 Service interval
The maintenance/service interval is set in months. Following an operating period of
the pump (1-4-2-3) that exceeds the maintenance/service interval, an information
message ("Service interval exceeded") is generated.
When the message is acknowledged, it continues to appear in the list of pending
messages.
The service interval can be reset. The information message is then deleted, and the
next service interval starts.
When resetting the counter for the pump runtime (1-4-2-4), the maintenance interval
is also automatically reset.
The service interval is deactivated by setting the interval time (3-9-13-1) to "0".
Table70: Service interval
Parameter Description Possible settings Refers to Factory setting
3-9-13-1 Interval Time
Time interval between notifications
for upcoming maintenance service
0...48m - 0
3-9-13-2 Reset Service Interval
The service interval is reset.
Run 1-4-2-4 -
8.8.3 Flow rate estimation
The flow rate and head estimation is based on the characteristic curves of the pump
and the operating data determined by the frequency inverter with regard to pump
input power and speed. Flow rate estimation is activated by the Flow Rate Estimation
parameter (3-9-8-1). The characteristic curves are entered as described in
(ðSection8.8.1,Page87) . If no pressure sensors are installed close to the pump for
improving flow rate estimation accuracy, a monotonically increasing power curve is
required.
NOTE
The actual characteristic curves of a pump can differ from the documented ones as
a result of manufacturing tolerances. Inaccuracies then arise for flow rate
estimation. Higher accuracies can be reached by using the characteristic curves
obtained from a pump acceptance test.