5.3.3 Frequency Inverter (18.5 to 30 kW)
Danger! Switch off power supply before connecting or disconnecting the mains
cable to terminal X1 Dangerous voltage may be present at the mains
terminals and the DC terminals even after the frequency inverter has been
disconnected safely from power supply. Wait for some minutes until the
DC link capacitors have discharged before starting the work.
• The unit may only be connected with the power supply switched off.
• Make sure that the frequency inverter is discharged.
Mains power connection 18.5 kW to 30 kW
0.5 … 35 mm
AWG 20 … 2
2
18.5 kW … 30 kW
PHOENIX MKDSP 25/ 6-15,00-
… 4
2
+
-
L1
L2 L3L1
L2
L3 PE
3ph / 400V AC
X1
X1
5.4 Motor Connection
The connection of the motor and the brake resistor to the frequency inverter is to be
done using shielded cables. The shield is to be connected to PE potential properly,
i.e. with good conductivity, on both sides. The control, mains and motor lines must
be kept physically separate from one another. The user must comply with the
applicable limits stipulated in the relevant national and international directives as
regards the application, the length of the motor cable and the switching frequency.
Permissible length of motor cable without output filter
Frequency inverter unshielded cable shielded cable
0.55 kW … 4.0 kW 50 m 25 m
5.5 kW … 15.0 kW 100 m 50 m
18.5 kW … 30.0 kW 150 m 50 m
The specified lengths of the motor cables must not be exceeded if no output filter is
installed. Upon request, we will check if longer motor cables can be used after taking
appropriate technical measures, e.g. use of low-capacitance cables and output filters.
Note: The frequency inverters ≤ 9.2 kW with integrated EMC filter comply with the
emission limits stipulated in EN 61800-3 if the motor cable is not longer than
10 m. Customer-specific requirements can be met by means of an optional
filter.
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