KSB PumpDrive 2 - Page 84

8 Commissioning/Shutdown
84 of 212
PumpDrive 2
Table59: Start/stop parameters
Parameter Description Possible settings Refers to Factory setting
3-7-3-3 Start Speed
A pump is started when the start
speed is reached.
0…140 % Nominal
pump speed
100 %
3-7-3-4 Stop Speed
A pump is stopped when the stop
speed is reached (only required for
pumps with flat characteristic
curves).
0…90 % Nominal
pump speed
50 %
3-7-3-5 Start Flow Rate
Start flow rate for starting a second
pump at nominal speed. Value
provided in % of maximum flow rate
Q6. Switching limits for starting
additional pumps are derived from
this value.
0…100 % Maximum
flow rate
95 %
3-7-3-6 KSB PumpDynamicControl
Shift between energy-efficient (0%)
and dynamic operating mode
(100%)
0…100 % - 30 %
3-7-3-1 Min. Time Start
Minimum period of time between
two starts
0.0…600.0s - 10 s
3-7-3-2 Min. Time Stop
Minimum period of time between
two stops
0.0…600.0s - 20 s
3-2-2-1 Minimum Motor Speed 0…4000 rpm - 500 rpm
3-4-3-30 Low Flow Limit Flow Rate in %
Q
opt
Flow rate for low flow limit at
nominal speed
0…100 % Best
efficiency
point Q
opt
30 %
3-7-3-7 Time Delay_Trigger Criterion
Period of time for which a start or
stop condition (speed and/or flow
rate limit) must be continually
violated before a pump is started or
stopped.
0.1…600 s - 5 s
Detailed parameter description
NOTE
Frequency inverters that are parameterised at the factory for the pump set are
provided with parameters that have already been optimised for starting and
stopping.
The following diagram shows the switching limits of a running pump in a multiple
pump system and the associated parameters in the head / flow rate diagram.