Use On It Systems - Lenze 9300 vector Série Instructions De Montage

5.3

Use on IT systems

Controllers in the V024, V104 or V100 variants are suitable for operation on insulated
supply systems (IT systems). The controllers also have an insulated design. This avoids the
activation of the insulation monitoring, even if several controllers are installed.
The electric strength of the controllers is increased so that damage to the controller are
avoided if insulation or earth faults in the supply system occur. The operational reliability
of the system remains intact.
(
Stop!
Only operate the controllers with the mains chokes assigned.
Operation with mains filters or RFI filters by Lenze is not permitted, as these
modules contain components that are interconnected against PE. By this the
protective design of the IT system would be cancelled out. The components are
destroyed in the case of an earth fault.
Protect the IT system against earth fault at the controller.
Due to physical conditions, an earth fault on the motor side at the controller
can interfere with or damage other devices on the same IT system. Therefore
appropriate measures have to be implemented, by means of which the earth
fault is detected and which disconnect the controller from the mains.
Permissible supply forms and electrical supply conditions
Mains
With isolated star point (IT
systems)
DC−bus operation of several drives
Central supply with 9340 regenerative power supply module is not possible.
Installation of the CE−typical drive system
For the installation of drives on IT systems, the same conditions apply as for the installation
on systems with an earthed neutral point.
According to the binding EMC product standard EN61800−3, no limit values are defined for
IT systems for noise emission in the high−frequency range.
EDKVF9333V DE/EN/FR 7.2
Operation of the controllers
Possible, if the controller is protected in
the event of an earth fault in the
supplying mains.
l Possible, if appropriate earth fault
detections are available and
l
the controller is immediately
disconnected from the mains.
l
Electrical installation
Use on IT systems
Notes
Safe operation in the event of an earth
fault at the inverter output cannot be
guaranteed.
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