KSB PumpDrive - 7.2.6.2 V;f characteristic

7.2.6.2 V/f characteristic
The PumpDrive V/f characteristic can be parameterised as required via parameters
3-3-1-1 to 3-3-1-9 (four data points). By optimising the V/f characteristic in accordance
with the pump characteristic, the motor current can be adjusted in line with the
required load torque. This can save a significant amount of energy in the medium
speed range. If the values of all the data points are set to zero, PumpDrive operates
with a linear V/f characteristic. By default, PumpDrive is set to a square V/f
characteristic.
U
4
f
4
U
3
f
3
U
2
f
2
U
1
f
1
U
0
Fig. 48: V/f characteristic
Table 100: Parameters for the V/f characteristic
Parameter Description Possible settings Reference to Factory setting
3-3-1-1 Boost voltage for
voltage V0
0..15 (%) 3-3-2-2 2
3-3-1-2 Voltage data point
V1
0..100 (%) 3-3-2-2 4
3-3-1-3 Frequency data
point f1
0..100 (%) 3-3-2-3 20
3-3-1-4 Voltage data point
V2
0..100 (%) 3-3-2-2 16
3-3-1-5 Frequency data
point f2
0..100 % 3-3-2-3 40
3-3-1-6 Voltage data point
V3
0..100 (%) 3-3-2-2 64
3-3-1-7 Frequency data
point f3
0..100 (%) 3-3-2-3 80
3-3-1-8 Voltage data point
V4
0..100 (%) 3-3-2-2 100
3-3-1-9 Frequency data
point f4
0..100 (%) 3-3-2-3 100
3-3-2-2 Motor nominal
voltage
Depending on the size Depending on the size
3-3-2-3 Motor nominal
frequency
By increasing the first two voltage data points V0 (4 % recommended) and V1 (8 %
recommended), a higher torque can be generated if a higher breakaway torque is
required.
7.3 Device functions
7.3.1 Reset PumpDrive to factory settings
All the factory parameter settings can be restored via the 3-1-5-5 parameter
command. Before doing this, make sure that no start signal is present on digital input
1. Once you have restored the settings, the nominal motor data ( 3-3-2-1 to 3-3-2-6 )
may need to be re-entered.
When the factory settings are restored, automatic sensor recognition is activated
(3-9-1-6) . This can result in automatic activation of the PI controller if a signal is
present on analog input 2. If you do not want this, you must deactivate the sensor
7 Commissioning/shutdown
PumpDrive
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