2 Assembly and installation
BU 0600 en-2319 41
As delivered, the device 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.
Adaptation is carried out via two screw connections. The two screws must be removed from the
housing to enable IT network operation.
1) Motor output 2) Mains input
Use with differing supply networks or network types
The frequency inverter may only be connect to and operated in supply networks which are explicitly
stated in this section ( Section 2.5.3.2 "Mains connection (PE, L1, L2/N, L3)")). Operation in
deviating network types may be possible, but must be explicitly checked and approved by the
manufacturer in advance.
2.5.3.3 Motor cable (U, V, W, PE)
The motor cable may have a total length of 100 m if it is a standard cable type (take EMC into
consideration). If a screened motor cable is used, or if the cable is laid in a well-earthed metal conduit,
the total length should not exceed 30 m (connect cable shield to PE, on both sides).
For greater lengths of cable, an additional output choke (accessory) must be used.
Synchronous motors or multiple motor operation
If synchronous motors or several motors are connected in parallel to an FI, the frequency inverter
must be switched over to linear voltage/frequency characteristic curves, ( P211 = 0 and P212 = 0).
For multiple motor operation the total motor cable length consists of the sum of the individual motor
cable lengths.
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