The line input currents may vary depending on the actual line impedance. In low-
impedance mains, higher currents may occur. To limit the line input current, external
line chokes can be used alongside the line chokes already integrated in PumpDrive
(in the power range up to and including 45 kW).
If longer connection cables than those listed above are required or the connection
cable's stray capacitance value exceeds the above values, we recommend installing a
suitable output filter between PumpDrive and the motor to be controlled. These
filters reduce the voltage ramp-up time of the PumpDrive output voltages and limit
their peaks.
1.
Install a line choke in series (in the power cable) upstream of PumpDrive.
2.
Install an output filter in series in the motor connection cable downstream of
PumpDrive.
5.4.3.4
Establishing an earth connection
PumpDrive must be earthed.
Observe the following when establishing the earth connection:
▪
Ensure that the cable lengths are as short as possible.
▪
Use different earth bus bars for the control and power/motor connection cables.
▪
The earth bus bar of the control cable must not be affected by currents from the
power/motor connection cables since this could be a source of interference.
Connect the following to the earth bus bar of the power/motor connection cable:
▪
Motor earthing connections
▪
PumpDrive housing
▪
Shielding of the power/motor connection cable
Connect the following to the earth bus bar of the control cable:
▪
Shielding of the analog control connections
▪
Shielding of the sensor cables
▪
Shielding of the field bus connection cable
Fig. 14: Establishing an earth connection
If you are installing more than one PumpDrive, the star configuration is
recommended.
Line choke
Output filter
Installing multiple
PumpDrives
5 Installation at Site
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PumpDrive
