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
93 of 162
