Lenze EVS9332xS - Manual (Page 81)

Wiring of the standard device
Notes on project planning
Controllers in the IT system
5
5.2
5.2.3
l
5.2−2 EDSVS9332S EN 6.0−07/2013
5.2.3 Controllers in the IT system
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.
Mains Operation of the controllers Notes
With isolated star
point (IT systems) 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.
Safe operation in the event of an
earth fault at the inverter output
cannot be guaranteed.
Central supply with 9340 regenerative power supply module is not possible.
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.
Permissible supply forms and
electrical supply conditions
DC−bus operation of several
drives
Installation of the CE−typical
drive system