2 Assembly and installation
BU 0540 EN-1516
15
6. Shielded or armoured cables should be used for the load connections (motor cable). The shielding
or armouring must be earthed at both ends. If possible, earthing should be made directly to the
electrically conducting mounting plate of the control cabinet or the screening angle of the EMC Kit.
In addition, EMC-compliant wiring must be ensured. If required, an optional output choke can be
supplied
The safety regulations must be complied with under all circumstances when installing the
frequency inverter!
NOTICE
Interference and damage
The control cables, mains cables and motor cables must be laid separately. Under no circumstances may they be
installed in a common conduit or installation duct, in order to prevent interference.
The test equipment for high voltage insulations must not be used on cables that are connected to the motor
controller. Failure to comply with this will cause damage to the drive electronics.
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2.2.2 Adaptation to IT networks
As delivered, the inverter is configured for operation in TN or TT networks. For operation in IT
networks, simple adaptations must be made. However, these impair the suppression of radio
interference.
Up to and including Size 7, the adaptation is made with jumpers. As delivered, the jumpers are set in
the “normal position”. With this, the mains filter has its normal effect and leakage current. Above Size
8 a DIP switch element is provided. According to the position of the DIP switch, the frequency inverter
is configured for TN/TT network operation or for IT network operation.
Frequency inverter Jumper A
1)
Jumper B
Comments
Leakage current
Size 1 - 4
Position 1
Position 1
Operation in IT network
Not applicable
Size 1 - 4
Position 3
Position 2
Large filtering effect
< 30 mA
Size 1 - 4
Position 3
Position 3
2)
Reduced filtering effect
2)
<< 30 mA
> 3. mA
Size 5 - 7
Position 0
Position 1
Operation in IT network
Not applicable
Size 5 - 7
Position 4
Position 2
Large filtering effect
< 6 mA
DIP-Switch "EMC Filter"
Size 8 – 11
OFF
Operation in IT network
< 30 mA
Size 8 – 11
ON
Large filtering effect
< 10 mA
1) Jumper "A" is only for type SK 5xxE-…-A inverters
2) Only valid for type SK 5xxE-…-A inverters. For type SK 5xxE-…-O inverters, this jumper position is similar to position 1
Table 4: Adaptation of integrated mains filter
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NOTICE
Operation in IT networks
The use of this frequency inverter on an
IT network
is possible after modification of the integrated mains filter.
It is urgently recommended that the frequency inverter is only operated on a IT network if a braking resistor is
connected. If an earthing fault occurs in the IT network, this measure prevents an impermissible charging of the
link circuit capacitor and the associated destruction of the frequency inverter.
For operation with an insulation monitor, the insulation resistance of the frequency inverter must be taken into
account.
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