Lenze E70AC Series Hardware Manual page 102

6 Electrical installation
Measures when drive is used in IT systems
(
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 an isolated neutral
point (IT systems)
Permissible supply forms and electrical supply conditions
Mains
With isolated star point (IT
systems)
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.
102
Operation of the controllers
Permissible if an earth fault is detected
and eliminated by suitable mechanisms
as soon as possible.
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
Comments
l
An earth fault on the motor side with
a switching frequency of 4 kHz or
8 kHz can cause a safety shutdown of
the device.
l An earth fault on the motor side at
16 kHz presents an impermissible
load for the controller.
Notes
Safe operation in the event of an earth
fault at the inverter output cannot be
guaranteed.
EDS700ACBA EN 5.1